posix: New function posix_spawn_file_actions_addfchdir_np [BZ #17405]

Message ID 874lbyu1c2.fsf@oldenburg.str.redhat.com
State Committed
Headers

Commit Message

Florian Weimer Nov. 30, 2018, 1:44 p.m. UTC
  This will need porting to Hurd (currently it results in a -Werror
failure); it should be easier than the last time.  Since the
cross-buildbot is broken right now anyway, I intend to commit this once
the generic/Linux portion is approved.

Thanks,
Florian

-----
2018-11-30  Florian Weimer  <fweimer@redhat.com>

	[BZ #17405]
	* posix/Makefile (routines): Add spawn_faction_addfchdir.
	* posix/Versions (GLIBC_2.29): Export
	posix_spawn_file_actions_addfchdir_np.
	* posix/spawn.h (posix_spawn_file_actions_addfchdir_np): Declare.
	* posix/spawn_faction_destroy.c
	(__posix_spawn_file_actions_destroy): Handle spawn_do_fchdir.
	* posix/spawn_int.h (struct __spawn_action): Add spawn_do_fchdir
	and the field action.fchdir_action.
	* posix/tst-spawn-chdir.c (add_chdir): New function.
	(do_test): Add do_fchdir loop.  Call add_chdir.
	* sysdeps/posix/spawni.c (__spawni_child): Handle spawn_do_fchdir.
	* sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Likewise.
	* sysdeps/mach/hurd/i386/libc.abilist (GLIBC_2.29): Add
	posix_spawn_file_actions_addfchdir_np.
	* sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
	(GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.29): Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.29):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.29):
	Likewise.
  

Comments

Adhemerval Zanella Netto Dec. 3, 2018, 7:59 p.m. UTC | #1
On 30/11/2018 11:44, Florian Weimer wrote:
> This will need porting to Hurd (currently it results in a -Werror
> failure); it should be easier than the last time.  Since the
> cross-buildbot is broken right now anyway, I intend to commit this once
> the generic/Linux portion is approved.

I think it is worth to mention on commit log there is an open POSIX enhancement
request [1] that aims to add similar functionality.

[1] http://austingroupbugs.net/view.php?id=1208

> 
> Thanks,
> Florian
> 
> -----
> 2018-11-30  Florian Weimer  <fweimer@redhat.com>
> 
> 	[BZ #17405]
> 	* posix/Makefile (routines): Add spawn_faction_addfchdir.
> 	* posix/Versions (GLIBC_2.29): Export
> 	posix_spawn_file_actions_addfchdir_np.
> 	* posix/spawn.h (posix_spawn_file_actions_addfchdir_np): Declare.
> 	* posix/spawn_faction_destroy.c
> 	(__posix_spawn_file_actions_destroy): Handle spawn_do_fchdir.
> 	* posix/spawn_int.h (struct __spawn_action): Add spawn_do_fchdir
> 	and the field action.fchdir_action.
> 	* posix/tst-spawn-chdir.c (add_chdir): New function.
> 	(do_test): Add do_fchdir loop.  Call add_chdir.
> 	* sysdeps/posix/spawni.c (__spawni_child): Handle spawn_do_fchdir.
> 	* sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Likewise.
> 	* sysdeps/mach/hurd/i386/libc.abilist (GLIBC_2.29): Add
> 	posix_spawn_file_actions_addfchdir_np.
> 	* sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> 	(GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.29): Likewise.
> 	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.29):
> 	Likewise.
> 
> diff --git a/NEWS b/NEWS
> index 1098be1afb..c2fa2f7a85 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -30,10 +30,12 @@ Major new features:
>    HTM state is saved and restore lazily (the state being saved even when the
>    process actually does not use HTM).
>  
> -* The posix_spawn_file_actions_addchdir_np function has been added,
> -  enabling posix_spawn and posix_spawnp to run the new process in a
> -  different directory.  This is a GNU extension and similar to the
> -  Solaris function of the same name.
> +* The functions posix_spawn_file_actions_addchdir_np and
> +  posix_spawn_file_actions_addfchdir_np have been added, enabling
> +  posix_spawn and posix_spawnp to run the new process in a different
> +  directory.  These functions are GNU extensions.  The function
> +  posix_spawn_file_actions_addchdir_np is similar to the Solaris function of
> +  the same name.
>  
>  Deprecated and removed features, and other changes affecting compatibility:
>  

Ok.

> diff --git a/posix/Makefile b/posix/Makefile
> index a8fb1e1839..d5a6844c88 100644
> --- a/posix/Makefile
> +++ b/posix/Makefile
> @@ -55,7 +55,7 @@ routines :=								      \
>  	pread pwrite pread64 pwrite64					      \
>  	spawn_faction_init spawn_faction_destroy spawn_faction_addclose	      \
>  	spawn_faction_addopen spawn_faction_adddup2 spawn_valid_fd	      \
> -	spawn_faction_addchdir 						      \
> +	spawn_faction_addchdir spawn_faction_addfchdir			      \
>  	spawnattr_init spawnattr_destroy				      \
>  	spawnattr_getdefault spawnattr_setdefault			      \
>  	spawnattr_getflags spawnattr_setflags				      \

Ok.

> diff --git a/posix/Versions b/posix/Versions
> index 56ab921562..ad693ae9a7 100644
> --- a/posix/Versions
> +++ b/posix/Versions
> @@ -139,6 +139,7 @@ libc {
>    }
>    GLIBC_2.29 {
>      posix_spawn_file_actions_addchdir_np;
> +    posix_spawn_file_actions_addfchdir_np;
>    }
>    GLIBC_PRIVATE {
>      __libc_fork; __libc_pread; __libc_pwrite;

Ok.

> diff --git a/posix/spawn.h b/posix/spawn.h
> index c84ee4bf72..8c40b4d28b 100644
> --- a/posix/spawn.h
> +++ b/posix/spawn.h
> @@ -190,6 +190,12 @@ extern int posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *
>     affects the subsequent file actions.  */
>  extern int posix_spawn_file_actions_addchdir_np (posix_spawn_file_actions_t *,
>  						 const char *__path) __THROW;
> +
> +/* Add an action changing the directory to FD during spawn.  This
> +   affects the subsequent file actions.  FD is not duplicated and must
> +   be open when the file action is executed.  */
> +extern int posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *,
> +						  int __fd) __THROW;
>  #endif
>  
>  __END_DECLS

Ok.

As side note, should posix_spawn_file_actions_addchdir_np use __restrict for
argument definitions? It also seems __restrict usage is also missing in some
places for spawn.h.

> diff --git a/posix/spawn_faction_addfchdir.c b/posix/spawn_faction_addfchdir.c
> new file mode 100644
> index 0000000000..6f069df29e
> --- /dev/null
> +++ b/posix/spawn_faction_addfchdir.c
> @@ -0,0 +1,46 @@
> +/* Add a directory change to a file action list for posix_spawn.
> +   Copyright (C) 2000-2018 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <errno.h>
> +#include <spawn.h>
> +#include <string.h>
> +
> +#include "spawn_int.h"
> +
> +int
> +posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *actions,
> +                                       int fd)
> +{
> +  struct __spawn_action *rec;
> +
> +  /* Allocate more memory if needed.  */
> +  if (actions->__used == actions->__allocated
> +      && __posix_spawn_file_actions_realloc (actions) != 0)
> +    /* This can only mean we ran out of memory.  */
> +    return ENOMEM;
> +
> +  /* Add the new value.  */
> +  rec = &actions->__actions[actions->__used];
> +  rec->tag = spawn_do_fchdir;
> +  rec->action.fchdir_action.fd = fd;
> +
> +  /* Account for the new entry.  */
> +  ++actions->__used;
> +
> +  return 0;
> +}

Ok.

> diff --git a/posix/spawn_faction_destroy.c b/posix/spawn_faction_destroy.c
> index 05ca9dc13b..da172a894e 100644
> --- a/posix/spawn_faction_destroy.c
> +++ b/posix/spawn_faction_destroy.c
> @@ -38,6 +38,7 @@ __posix_spawn_file_actions_destroy (posix_spawn_file_actions_t *file_actions)
>  	  break;
>  	case spawn_do_close:
>  	case spawn_do_dup2:
> +	case spawn_do_fchdir:
>  	  /* No cleanup required.  */
>  	  break;
>  	}

Ok.

> diff --git a/posix/spawn_int.h b/posix/spawn_int.h
> index 9db35553c2..0d0e438ff6 100644
> --- a/posix/spawn_int.h
> +++ b/posix/spawn_int.h
> @@ -31,6 +31,7 @@ struct __spawn_action
>      spawn_do_dup2,
>      spawn_do_open,
>      spawn_do_chdir,
> +    spawn_do_fchdir,
>    } tag;
>  
>    union
> @@ -55,6 +56,10 @@ struct __spawn_action
>      {
>        char *path;
>      } chdir_action;
> +    struct
> +    {
> +      int fd;
> +    } fchdir_action;
>    } action;
>  };
>  

Ok.

> diff --git a/posix/tst-spawn-chdir.c b/posix/tst-spawn-chdir.c
> index dc14f2059b..8f447955c1 100644
> --- a/posix/tst-spawn-chdir.c
> +++ b/posix/tst-spawn-chdir.c
> @@ -20,11 +20,13 @@
>  #include <errno.h>
>  #include <fcntl.h>
>  #include <spawn.h>
> +#include <stdbool.h>
>  #include <stdlib.h>
>  #include <string.h>
>  #include <support/check.h>
>  #include <support/support.h>
>  #include <support/temp_file.h>
> +#include <support/test-driver.h>
>  #include <support/xstdio.h>
>  #include <support/xunistd.h>
>  #include <unistd.h>
> @@ -64,6 +66,24 @@ get_pwd_program (void)
>    FAIL_EXIT1 ("cannot find pwd program");
>  }
>  
> +/* Adds chdir operations to ACTIONS, using PATH.  If DO_FCHDIR, use
> +   the open function and TMPFD to emulate chdir using fchdir.  */
> +static void
> +add_chdir (posix_spawn_file_actions_t *actions, const char *path,
> +           bool do_fchdir, int tmpfd)
> +{
> +  if (do_fchdir)
> +    {
> +      TEST_COMPARE (posix_spawn_file_actions_addopen
> +                    (actions, tmpfd, path, O_DIRECTORY | O_RDONLY, 0), 0);
> +      TEST_COMPARE (posix_spawn_file_actions_addfchdir_np
> +                    (actions, tmpfd), 0);
> +      TEST_COMPARE (posix_spawn_file_actions_addclose (actions, tmpfd), 0);
> +    }
> +  else
> +    TEST_COMPARE (posix_spawn_file_actions_addchdir_np (actions, path), 0);
> +}
> +
>  static int
>  do_test (void)
>  {
> @@ -87,102 +107,108 @@ do_test (void)
>    int iteration = 0;
>    for (int do_spawnp = 0; do_spawnp < 2; ++do_spawnp)
>      for (int do_overwrite = 0; do_overwrite < 2; ++do_overwrite)
> -      {
> -        ++iteration;
> -        printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d\n",
> -                iteration, do_spawnp, do_overwrite);
> +      for (int do_fchdir = 0; do_fchdir < 2; ++do_fchdir)
> +        {
> +          /* This subtest does not make sense for fchdir.  */
> +          if (do_overwrite && do_fchdir)
> +            continue;
>  
> -        /* The "pwd" program runs in this directory.  */
> -        char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
> -        add_temp_file (iteration_directory);
> -        xmkdir (iteration_directory, 0777);
> +          ++iteration;
> +          if (test_verbose > 0)
> +            printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d"
> +                    " do_fchdir=%d\n",
> +                    iteration, do_spawnp, do_overwrite, do_fchdir);
>  
> -        /* This file receives output from "pwd".  */
> -        char *output_file_path
> -          = xasprintf ("%s/output-file", iteration_directory);
> -        add_temp_file (output_file_path);
> +          /* The "pwd" program runs in this directory.  */
> +          char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
> +          add_temp_file (iteration_directory);
> +          xmkdir (iteration_directory, 0777);
>  
> -        /* This subdirectory is used for chdir ordering checks.  */
> -        char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
> -        add_temp_file (subdir_path);
> -        xmkdir (subdir_path, 0777);
> +          /* This file receives output from "pwd".  */
> +          char *output_file_path
> +            = xasprintf ("%s/output-file", iteration_directory);
> +          add_temp_file (output_file_path);
>  
> -        /* Also used for checking the order of actions.  */
> -        char *probe_file_path
> -          = xasprintf ("%s/subdir/probe-file", iteration_directory);
> -        add_temp_file (probe_file_path);
> -        TEST_COMPARE (access (probe_file_path, F_OK), -1);
> -        TEST_COMPARE (errno, ENOENT);
> +          /* This subdirectory is used for chdir ordering checks.  */
> +          char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
> +          add_temp_file (subdir_path);
> +          xmkdir (subdir_path, 0777);
>  
> -        /* This symbolic link is used in a relative path with
> -           posix_spawn.  */
> -        char *pwd_symlink_path
> -          = xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
> -        xsymlink (get_pwd_program (), pwd_symlink_path);
> -        add_temp_file (pwd_symlink_path);
> +          /* Also used for checking the order of actions.  */
> +          char *probe_file_path
> +            = xasprintf ("%s/subdir/probe-file", iteration_directory);
> +          add_temp_file (probe_file_path);
> +          TEST_COMPARE (access (probe_file_path, F_OK), -1);
> +          TEST_COMPARE (errno, ENOENT);
>  
> -        posix_spawn_file_actions_t actions;
> -        TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
> -        TEST_COMPARE (posix_spawn_file_actions_addchdir_np
> -                      (&actions, subdir_path), 0);
> -        TEST_COMPARE (posix_spawn_file_actions_addopen
> -                      (&actions, 3, /* Arbitrary unused descriptor.  */
> -                       "probe-file",
> -                       O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
> -        TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
> -        /* Run the actual in iteration_directory.  */
> -        TEST_COMPARE (posix_spawn_file_actions_addchdir_np (&actions, ".."), 0);
> -        TEST_COMPARE (posix_spawn_file_actions_addopen
> -                      (&actions, STDOUT_FILENO, "output-file",
> -                       O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
> +          /* This symbolic link is used in a relative path with
> +             posix_spawn.  */
> +          char *pwd_symlink_path
> +            = xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
> +          xsymlink (get_pwd_program (), pwd_symlink_path);
> +          add_temp_file (pwd_symlink_path);
>  
> -        /* Check that posix_spawn_file_actions_addchdir_np made a copy
> -           of the path.  */
> -        if (do_overwrite)
> -          subdir_path[0] = '\0';
> +          posix_spawn_file_actions_t actions;
> +          TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
> +          add_chdir (&actions, subdir_path, do_fchdir, 4);
> +          TEST_COMPARE (posix_spawn_file_actions_addopen
> +                        (&actions, 3, /* Arbitrary unused descriptor.  */
> +                         "probe-file",
> +                         O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
> +          TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
> +          /* Run the actual in iteration_directory.  */
> +          add_chdir (&actions, "..", do_fchdir, 5);
> +          TEST_COMPARE (posix_spawn_file_actions_addopen
> +                        (&actions, STDOUT_FILENO, "output-file",
> +                         O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
>  
> -        char *const argv[] = { (char *) "pwd", NULL };
> -        char *const envp[] = { NULL } ;
> -        pid_t pid;
> -        if (do_spawnp)
> -          TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
> -                                      NULL, argv, envp), 0);
> -        else
> -          TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
> -                                     NULL, argv, envp), 0);
> -        TEST_VERIFY (pid > 0);
> -        int status;
> -        xwaitpid (pid, &status, 0);
> -        TEST_COMPARE (status, 0);
> +          /* Check that posix_spawn_file_actions_addchdir_np made a copy
> +             of the path.  */
> +          if (do_overwrite)
> +            subdir_path[0] = '\0';
>  
> -        /* Check that the current directory did not change.  */
> -        {
> -          char *cwd = get_current_dir_name ();
> -          if (cwd == NULL)
> -            FAIL_EXIT1 ("get_current_dir_name: %m");
> -          TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
> -                             cwd, strlen (cwd));
> -          free (cwd);
> -        }
> +          char *const argv[] = { (char *) "pwd", NULL };
> +          char *const envp[] = { NULL } ;
> +          pid_t pid;
> +          if (do_spawnp)
> +            TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
> +                                        NULL, argv, envp), 0);
> +          else
> +            TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
> +                                       NULL, argv, envp), 0);
> +          TEST_VERIFY (pid > 0);
> +          int status;
> +          xwaitpid (pid, &status, 0);
> +          TEST_COMPARE (status, 0);
>  
> +          /* Check that the current directory did not change.  */
> +          {
> +            char *cwd = get_current_dir_name ();
> +            if (cwd == NULL)
> +              FAIL_EXIT1 ("get_current_dir_name: %m");
> +            TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
> +                               cwd, strlen (cwd));
> +            free (cwd);
> +          }
>  
> -        /* Check the output from "pwd".  */
> -        {
> -          char *pwd = read_one_line (output_file_path);
> -          TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
> -                             pwd, strlen (pwd));
> -          free (pwd);
> -        }
>  
> -        /* This file must now exist.  */
> -        TEST_COMPARE (access (probe_file_path, F_OK), 0);
> +          /* Check the output from "pwd".  */
> +          {
> +            char *pwd = read_one_line (output_file_path);
> +            TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
> +                               pwd, strlen (pwd));
> +            free (pwd);
> +          }
> +
> +          /* This file must now exist.  */
> +          TEST_COMPARE (access (probe_file_path, F_OK), 0);
>  
> -        TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
> -        free (pwd_symlink_path);
> -        free (probe_file_path);
> -        free (subdir_path);
> -        free (output_file_path);
> -      }
> +          TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
> +          free (pwd_symlink_path);
> +          free (probe_file_path);
> +          free (subdir_path);
> +          free (output_file_path);
> +        }
>  
>    free (directory);
>  

Ok.

> diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
> index d4c4a91c84..450430237d 100644
> --- a/sysdeps/mach/hurd/i386/libc.abilist
> +++ b/sysdeps/mach/hurd/i386/libc.abilist
> @@ -2040,6 +2040,7 @@ GLIBC_2.28 renameat2 F
>  GLIBC_2.28 statx F
>  GLIBC_2.29 _hurd_port_move F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/posix/spawni.c b/sysdeps/posix/spawni.c
> index c42fbd590e..18ccbddc98 100644
> --- a/sysdeps/posix/spawni.c
> +++ b/sysdeps/posix/spawni.c
> @@ -214,6 +214,11 @@ __spawni_child (void *arguments)
>  	      if (__chdir (action->action.chdir_action.path) != 0)
>  		goto fail;
>  	      break;
> +
> +	    case spawn_do_fchdir:
> +	      if (__fchdir (action->action.fchdir_action.fd) != 0)
> +		goto fail;
> +	      break;
>  	    }
>  	}
>      }

Ok.

> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index e66c741d04..8763e7b618 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2139,3 +2139,4 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index 8df162fe99..c7dfef32d6 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -2034,6 +2034,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
> index 43c804f9dc..a306d13a0f 100644
> --- a/sysdeps/unix/sysv/linux/arm/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
> @@ -124,6 +124,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.4 _Exit F
>  GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
>  GLIBC_2.4 _IO_2_1_stdin_ D 0xa0

Ok.

> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index 88b01c2e75..4285936c2c 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -1881,6 +1881,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 6d02f31612..d190399192 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2046,6 +2046,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index 4249712611..918daeb348 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -1915,6 +1915,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index d47b808862..c9e534cf8b 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -125,6 +125,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.4 _Exit F
>  GLIBC_2.4 _IO_2_1_stderr_ D 0x98
>  GLIBC_2.4 _IO_2_1_stdin_ D 0x98

Ok.

> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index d5e38308be..c8e70be876 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -1990,6 +1990,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> index 8596b84399..e356ec6d33 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> @@ -2131,3 +2131,4 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index 88e0f896d5..3154251d25 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -1968,6 +1968,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok

> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index aff7462c34..e9445adf14 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -1966,6 +1966,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index 71d82444aa..4043077bc3 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -1974,6 +1974,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index de6c53d293..e47cb434dc 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -1969,6 +1969,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index e724bab9fb..024c55f29e 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -2172,3 +2172,4 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index e9ecbccb71..5c26044f5e 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -1994,6 +1994,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index da83ea6028..a12e7b6708 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -1998,6 +1998,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> index 4535b40d15..939978e2af 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> @@ -2229,3 +2229,4 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> index 65725de4f0..82f5aeed33 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> @@ -124,6 +124,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 _Exit F
>  GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
>  GLIBC_2.3 _IO_2_1_stdin_ D 0xe0

Ok.

> diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> index bbb3c4a8e7..9e7c904d2c 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> @@ -2101,3 +2101,4 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index e85ac2a178..f4a52b543a 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -2003,6 +2003,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index d56931022c..8d8a4035bb 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -1909,6 +1909,7 @@ GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 __fentry__ F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
> index ff939a15c4..5c05555842 100644
> --- a/sysdeps/unix/sysv/linux/sh/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
> @@ -1885,6 +1885,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index 64fa9e10a5..4d4e972d58 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -1997,6 +1997,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index db909d1506..96ad7b8325 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -1938,6 +1938,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c
> index 9f3a137b5c..cb18e3d4ac 100644
> --- a/sysdeps/unix/sysv/linux/spawni.c
> +++ b/sysdeps/unix/sysv/linux/spawni.c
> @@ -263,6 +263,11 @@ __spawni_child (void *arguments)
>  	      if (__chdir (action->action.chdir_action.path) != 0)
>  		goto fail;
>  	      break;
> +
> +	    case spawn_do_fchdir:
> +	      if (__fchdir (action->action.fchdir_action.fd) != 0)
> +		goto fail;
> +	      break;
>  	    }
>  	}
>      }

Ok.

> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index 3b175f104b..52e65c5020 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -1896,6 +1896,7 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
>  GLIBC_2.3 __ctype_b_loc F
>  GLIBC_2.3 __ctype_tolower_loc F
>  GLIBC_2.3 __ctype_toupper_loc F

Ok.

> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index 1b57710477..dccc15bb67 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -2147,3 +2147,4 @@ GLIBC_2.28 thrd_equal F
>  GLIBC_2.28 thrd_sleep F
>  GLIBC_2.28 thrd_yield F
>  GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
> +GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
> 

Ok.
  
Florian Weimer Dec. 3, 2018, 9:25 p.m. UTC | #2
* Adhemerval Zanella:

> On 30/11/2018 11:44, Florian Weimer wrote:
>> This will need porting to Hurd (currently it results in a -Werror
>> failure); it should be easier than the last time.  Since the
>> cross-buildbot is broken right now anyway, I intend to commit this once
>> the generic/Linux portion is approved.
>
> I think it is worth to mention on commit log there is an open POSIX
> enhancement request [1] that aims to add similar functionality.
>
> [1] http://austingroupbugs.net/view.php?id=1208

Something like this?

Along with posix_spawn_file_actions_addchdir,
posix_spawn_file_actions_addfchdir is the subject of a change proposal
for POSIX: <http://austingroupbugs.net/view.php?id=1208>

> As side note, should posix_spawn_file_actions_addchdir_np use __restrict for
> argument definitions? It also seems __restrict usage is also missing in some
> places for spawn.h.

There are other attributtes missing as well (nonnull comes to my mind).
I think we should add them in one go.

Thanks,
Florian
  
Florian Weimer Dec. 5, 2018, 1:21 p.m. UTC | #3
* Florian Weimer:

> * Adhemerval Zanella:
>
>> On 30/11/2018 11:44, Florian Weimer wrote:
>>> This will need porting to Hurd (currently it results in a -Werror
>>> failure); it should be easier than the last time.  Since the
>>> cross-buildbot is broken right now anyway, I intend to commit this once
>>> the generic/Linux portion is approved.
>>
>> I think it is worth to mention on commit log there is an open POSIX
>> enhancement request [1] that aims to add similar functionality.
>>
>> [1] http://austingroupbugs.net/view.php?id=1208
>
> Something like this?
>
> Along with posix_spawn_file_actions_addchdir,
> posix_spawn_file_actions_addfchdir is the subject of a change proposal
> for POSIX: <http://austingroupbugs.net/view.php?id=1208>

Any further comments on the patch?

Thanks,
Florian
  
Adhemerval Zanella Netto Dec. 5, 2018, 1:51 p.m. UTC | #4
On 03/12/2018 19:25, Florian Weimer wrote:
> * Adhemerval Zanella:
> 
>> On 30/11/2018 11:44, Florian Weimer wrote:
>>> This will need porting to Hurd (currently it results in a -Werror
>>> failure); it should be easier than the last time.  Since the
>>> cross-buildbot is broken right now anyway, I intend to commit this once
>>> the generic/Linux portion is approved.
>>
>> I think it is worth to mention on commit log there is an open POSIX
>> enhancement request [1] that aims to add similar functionality.
>>
>> [1] http://austingroupbugs.net/view.php?id=1208
> 
> Something like this?
> 
> Along with posix_spawn_file_actions_addchdir,
> posix_spawn_file_actions_addfchdir is the subject of a change proposal
> for POSIX: <http://austingroupbugs.net/view.php?id=1208>
> 

LGTM.

>> As side note, should posix_spawn_file_actions_addchdir_np use __restrict for
>> argument definitions? It also seems __restrict usage is also missing in some
>> places for spawn.h.
> 
> There are other attributtes missing as well (nonnull comes to my mind).
> I think we should add them in one go.

We can fix these in a subsequent patch.
  

Patch

diff --git a/NEWS b/NEWS
index 1098be1afb..c2fa2f7a85 100644
--- a/NEWS
+++ b/NEWS
@@ -30,10 +30,12 @@  Major new features:
   HTM state is saved and restore lazily (the state being saved even when the
   process actually does not use HTM).
 
-* The posix_spawn_file_actions_addchdir_np function has been added,
-  enabling posix_spawn and posix_spawnp to run the new process in a
-  different directory.  This is a GNU extension and similar to the
-  Solaris function of the same name.
+* The functions posix_spawn_file_actions_addchdir_np and
+  posix_spawn_file_actions_addfchdir_np have been added, enabling
+  posix_spawn and posix_spawnp to run the new process in a different
+  directory.  These functions are GNU extensions.  The function
+  posix_spawn_file_actions_addchdir_np is similar to the Solaris function of
+  the same name.
 
 Deprecated and removed features, and other changes affecting compatibility:
 
diff --git a/posix/Makefile b/posix/Makefile
index a8fb1e1839..d5a6844c88 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -55,7 +55,7 @@  routines :=								      \
 	pread pwrite pread64 pwrite64					      \
 	spawn_faction_init spawn_faction_destroy spawn_faction_addclose	      \
 	spawn_faction_addopen spawn_faction_adddup2 spawn_valid_fd	      \
-	spawn_faction_addchdir 						      \
+	spawn_faction_addchdir spawn_faction_addfchdir			      \
 	spawnattr_init spawnattr_destroy				      \
 	spawnattr_getdefault spawnattr_setdefault			      \
 	spawnattr_getflags spawnattr_setflags				      \
diff --git a/posix/Versions b/posix/Versions
index 56ab921562..ad693ae9a7 100644
--- a/posix/Versions
+++ b/posix/Versions
@@ -139,6 +139,7 @@  libc {
   }
   GLIBC_2.29 {
     posix_spawn_file_actions_addchdir_np;
+    posix_spawn_file_actions_addfchdir_np;
   }
   GLIBC_PRIVATE {
     __libc_fork; __libc_pread; __libc_pwrite;
diff --git a/posix/spawn.h b/posix/spawn.h
index c84ee4bf72..8c40b4d28b 100644
--- a/posix/spawn.h
+++ b/posix/spawn.h
@@ -190,6 +190,12 @@  extern int posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *
    affects the subsequent file actions.  */
 extern int posix_spawn_file_actions_addchdir_np (posix_spawn_file_actions_t *,
 						 const char *__path) __THROW;
+
+/* Add an action changing the directory to FD during spawn.  This
+   affects the subsequent file actions.  FD is not duplicated and must
+   be open when the file action is executed.  */
+extern int posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *,
+						  int __fd) __THROW;
 #endif
 
 __END_DECLS
diff --git a/posix/spawn_faction_addfchdir.c b/posix/spawn_faction_addfchdir.c
new file mode 100644
index 0000000000..6f069df29e
--- /dev/null
+++ b/posix/spawn_faction_addfchdir.c
@@ -0,0 +1,46 @@ 
+/* Add a directory change to a file action list for posix_spawn.
+   Copyright (C) 2000-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <spawn.h>
+#include <string.h>
+
+#include "spawn_int.h"
+
+int
+posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *actions,
+                                       int fd)
+{
+  struct __spawn_action *rec;
+
+  /* Allocate more memory if needed.  */
+  if (actions->__used == actions->__allocated
+      && __posix_spawn_file_actions_realloc (actions) != 0)
+    /* This can only mean we ran out of memory.  */
+    return ENOMEM;
+
+  /* Add the new value.  */
+  rec = &actions->__actions[actions->__used];
+  rec->tag = spawn_do_fchdir;
+  rec->action.fchdir_action.fd = fd;
+
+  /* Account for the new entry.  */
+  ++actions->__used;
+
+  return 0;
+}
diff --git a/posix/spawn_faction_destroy.c b/posix/spawn_faction_destroy.c
index 05ca9dc13b..da172a894e 100644
--- a/posix/spawn_faction_destroy.c
+++ b/posix/spawn_faction_destroy.c
@@ -38,6 +38,7 @@  __posix_spawn_file_actions_destroy (posix_spawn_file_actions_t *file_actions)
 	  break;
 	case spawn_do_close:
 	case spawn_do_dup2:
+	case spawn_do_fchdir:
 	  /* No cleanup required.  */
 	  break;
 	}
diff --git a/posix/spawn_int.h b/posix/spawn_int.h
index 9db35553c2..0d0e438ff6 100644
--- a/posix/spawn_int.h
+++ b/posix/spawn_int.h
@@ -31,6 +31,7 @@  struct __spawn_action
     spawn_do_dup2,
     spawn_do_open,
     spawn_do_chdir,
+    spawn_do_fchdir,
   } tag;
 
   union
@@ -55,6 +56,10 @@  struct __spawn_action
     {
       char *path;
     } chdir_action;
+    struct
+    {
+      int fd;
+    } fchdir_action;
   } action;
 };
 
diff --git a/posix/tst-spawn-chdir.c b/posix/tst-spawn-chdir.c
index dc14f2059b..8f447955c1 100644
--- a/posix/tst-spawn-chdir.c
+++ b/posix/tst-spawn-chdir.c
@@ -20,11 +20,13 @@ 
 #include <errno.h>
 #include <fcntl.h>
 #include <spawn.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <support/check.h>
 #include <support/support.h>
 #include <support/temp_file.h>
+#include <support/test-driver.h>
 #include <support/xstdio.h>
 #include <support/xunistd.h>
 #include <unistd.h>
@@ -64,6 +66,24 @@  get_pwd_program (void)
   FAIL_EXIT1 ("cannot find pwd program");
 }
 
+/* Adds chdir operations to ACTIONS, using PATH.  If DO_FCHDIR, use
+   the open function and TMPFD to emulate chdir using fchdir.  */
+static void
+add_chdir (posix_spawn_file_actions_t *actions, const char *path,
+           bool do_fchdir, int tmpfd)
+{
+  if (do_fchdir)
+    {
+      TEST_COMPARE (posix_spawn_file_actions_addopen
+                    (actions, tmpfd, path, O_DIRECTORY | O_RDONLY, 0), 0);
+      TEST_COMPARE (posix_spawn_file_actions_addfchdir_np
+                    (actions, tmpfd), 0);
+      TEST_COMPARE (posix_spawn_file_actions_addclose (actions, tmpfd), 0);
+    }
+  else
+    TEST_COMPARE (posix_spawn_file_actions_addchdir_np (actions, path), 0);
+}
+
 static int
 do_test (void)
 {
@@ -87,102 +107,108 @@  do_test (void)
   int iteration = 0;
   for (int do_spawnp = 0; do_spawnp < 2; ++do_spawnp)
     for (int do_overwrite = 0; do_overwrite < 2; ++do_overwrite)
-      {
-        ++iteration;
-        printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d\n",
-                iteration, do_spawnp, do_overwrite);
+      for (int do_fchdir = 0; do_fchdir < 2; ++do_fchdir)
+        {
+          /* This subtest does not make sense for fchdir.  */
+          if (do_overwrite && do_fchdir)
+            continue;
 
-        /* The "pwd" program runs in this directory.  */
-        char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
-        add_temp_file (iteration_directory);
-        xmkdir (iteration_directory, 0777);
+          ++iteration;
+          if (test_verbose > 0)
+            printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d"
+                    " do_fchdir=%d\n",
+                    iteration, do_spawnp, do_overwrite, do_fchdir);
 
-        /* This file receives output from "pwd".  */
-        char *output_file_path
-          = xasprintf ("%s/output-file", iteration_directory);
-        add_temp_file (output_file_path);
+          /* The "pwd" program runs in this directory.  */
+          char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
+          add_temp_file (iteration_directory);
+          xmkdir (iteration_directory, 0777);
 
-        /* This subdirectory is used for chdir ordering checks.  */
-        char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
-        add_temp_file (subdir_path);
-        xmkdir (subdir_path, 0777);
+          /* This file receives output from "pwd".  */
+          char *output_file_path
+            = xasprintf ("%s/output-file", iteration_directory);
+          add_temp_file (output_file_path);
 
-        /* Also used for checking the order of actions.  */
-        char *probe_file_path
-          = xasprintf ("%s/subdir/probe-file", iteration_directory);
-        add_temp_file (probe_file_path);
-        TEST_COMPARE (access (probe_file_path, F_OK), -1);
-        TEST_COMPARE (errno, ENOENT);
+          /* This subdirectory is used for chdir ordering checks.  */
+          char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
+          add_temp_file (subdir_path);
+          xmkdir (subdir_path, 0777);
 
-        /* This symbolic link is used in a relative path with
-           posix_spawn.  */
-        char *pwd_symlink_path
-          = xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
-        xsymlink (get_pwd_program (), pwd_symlink_path);
-        add_temp_file (pwd_symlink_path);
+          /* Also used for checking the order of actions.  */
+          char *probe_file_path
+            = xasprintf ("%s/subdir/probe-file", iteration_directory);
+          add_temp_file (probe_file_path);
+          TEST_COMPARE (access (probe_file_path, F_OK), -1);
+          TEST_COMPARE (errno, ENOENT);
 
-        posix_spawn_file_actions_t actions;
-        TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
-        TEST_COMPARE (posix_spawn_file_actions_addchdir_np
-                      (&actions, subdir_path), 0);
-        TEST_COMPARE (posix_spawn_file_actions_addopen
-                      (&actions, 3, /* Arbitrary unused descriptor.  */
-                       "probe-file",
-                       O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
-        TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
-        /* Run the actual in iteration_directory.  */
-        TEST_COMPARE (posix_spawn_file_actions_addchdir_np (&actions, ".."), 0);
-        TEST_COMPARE (posix_spawn_file_actions_addopen
-                      (&actions, STDOUT_FILENO, "output-file",
-                       O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
+          /* This symbolic link is used in a relative path with
+             posix_spawn.  */
+          char *pwd_symlink_path
+            = xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
+          xsymlink (get_pwd_program (), pwd_symlink_path);
+          add_temp_file (pwd_symlink_path);
 
-        /* Check that posix_spawn_file_actions_addchdir_np made a copy
-           of the path.  */
-        if (do_overwrite)
-          subdir_path[0] = '\0';
+          posix_spawn_file_actions_t actions;
+          TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
+          add_chdir (&actions, subdir_path, do_fchdir, 4);
+          TEST_COMPARE (posix_spawn_file_actions_addopen
+                        (&actions, 3, /* Arbitrary unused descriptor.  */
+                         "probe-file",
+                         O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
+          TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
+          /* Run the actual in iteration_directory.  */
+          add_chdir (&actions, "..", do_fchdir, 5);
+          TEST_COMPARE (posix_spawn_file_actions_addopen
+                        (&actions, STDOUT_FILENO, "output-file",
+                         O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
 
-        char *const argv[] = { (char *) "pwd", NULL };
-        char *const envp[] = { NULL } ;
-        pid_t pid;
-        if (do_spawnp)
-          TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
-                                      NULL, argv, envp), 0);
-        else
-          TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
-                                     NULL, argv, envp), 0);
-        TEST_VERIFY (pid > 0);
-        int status;
-        xwaitpid (pid, &status, 0);
-        TEST_COMPARE (status, 0);
+          /* Check that posix_spawn_file_actions_addchdir_np made a copy
+             of the path.  */
+          if (do_overwrite)
+            subdir_path[0] = '\0';
 
-        /* Check that the current directory did not change.  */
-        {
-          char *cwd = get_current_dir_name ();
-          if (cwd == NULL)
-            FAIL_EXIT1 ("get_current_dir_name: %m");
-          TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
-                             cwd, strlen (cwd));
-          free (cwd);
-        }
+          char *const argv[] = { (char *) "pwd", NULL };
+          char *const envp[] = { NULL } ;
+          pid_t pid;
+          if (do_spawnp)
+            TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
+                                        NULL, argv, envp), 0);
+          else
+            TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
+                                       NULL, argv, envp), 0);
+          TEST_VERIFY (pid > 0);
+          int status;
+          xwaitpid (pid, &status, 0);
+          TEST_COMPARE (status, 0);
 
+          /* Check that the current directory did not change.  */
+          {
+            char *cwd = get_current_dir_name ();
+            if (cwd == NULL)
+              FAIL_EXIT1 ("get_current_dir_name: %m");
+            TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
+                               cwd, strlen (cwd));
+            free (cwd);
+          }
 
-        /* Check the output from "pwd".  */
-        {
-          char *pwd = read_one_line (output_file_path);
-          TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
-                             pwd, strlen (pwd));
-          free (pwd);
-        }
 
-        /* This file must now exist.  */
-        TEST_COMPARE (access (probe_file_path, F_OK), 0);
+          /* Check the output from "pwd".  */
+          {
+            char *pwd = read_one_line (output_file_path);
+            TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
+                               pwd, strlen (pwd));
+            free (pwd);
+          }
+
+          /* This file must now exist.  */
+          TEST_COMPARE (access (probe_file_path, F_OK), 0);
 
-        TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
-        free (pwd_symlink_path);
-        free (probe_file_path);
-        free (subdir_path);
-        free (output_file_path);
-      }
+          TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
+          free (pwd_symlink_path);
+          free (probe_file_path);
+          free (subdir_path);
+          free (output_file_path);
+        }
 
   free (directory);
 
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index d4c4a91c84..450430237d 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2040,6 +2040,7 @@  GLIBC_2.28 renameat2 F
 GLIBC_2.28 statx F
 GLIBC_2.29 _hurd_port_move F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/posix/spawni.c b/sysdeps/posix/spawni.c
index c42fbd590e..18ccbddc98 100644
--- a/sysdeps/posix/spawni.c
+++ b/sysdeps/posix/spawni.c
@@ -214,6 +214,11 @@  __spawni_child (void *arguments)
 	      if (__chdir (action->action.chdir_action.path) != 0)
 		goto fail;
 	      break;
+
+	    case spawn_do_fchdir:
+	      if (__fchdir (action->action.fchdir_action.fd) != 0)
+		goto fail;
+	      break;
 	    }
 	}
     }
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index e66c741d04..8763e7b618 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2139,3 +2139,4 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 8df162fe99..c7dfef32d6 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2034,6 +2034,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
index 43c804f9dc..a306d13a0f 100644
--- a/sysdeps/unix/sysv/linux/arm/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
@@ -124,6 +124,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index 88b01c2e75..4285936c2c 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -1881,6 +1881,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 6d02f31612..d190399192 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2046,6 +2046,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index 4249712611..918daeb348 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -1915,6 +1915,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index d47b808862..c9e534cf8b 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -125,6 +125,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0x98
 GLIBC_2.4 _IO_2_1_stdin_ D 0x98
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index d5e38308be..c8e70be876 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -1990,6 +1990,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
index 8596b84399..e356ec6d33 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
@@ -2131,3 +2131,4 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index 88e0f896d5..3154251d25 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -1968,6 +1968,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index aff7462c34..e9445adf14 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -1966,6 +1966,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index 71d82444aa..4043077bc3 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -1974,6 +1974,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index de6c53d293..e47cb434dc 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -1969,6 +1969,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index e724bab9fb..024c55f29e 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2172,3 +2172,4 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index e9ecbccb71..5c26044f5e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -1994,6 +1994,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index da83ea6028..a12e7b6708 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -1998,6 +1998,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
index 4535b40d15..939978e2af 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
@@ -2229,3 +2229,4 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
index 65725de4f0..82f5aeed33 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
@@ -124,6 +124,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 _Exit F
 GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
 GLIBC_2.3 _IO_2_1_stdin_ D 0xe0
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index bbb3c4a8e7..9e7c904d2c 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2101,3 +2101,4 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index e85ac2a178..f4a52b543a 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -2003,6 +2003,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index d56931022c..8d8a4035bb 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -1909,6 +1909,7 @@  GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 __fentry__ F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
index ff939a15c4..5c05555842 100644
--- a/sysdeps/unix/sysv/linux/sh/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
@@ -1885,6 +1885,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 64fa9e10a5..4d4e972d58 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -1997,6 +1997,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index db909d1506..96ad7b8325 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -1938,6 +1938,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c
index 9f3a137b5c..cb18e3d4ac 100644
--- a/sysdeps/unix/sysv/linux/spawni.c
+++ b/sysdeps/unix/sysv/linux/spawni.c
@@ -263,6 +263,11 @@  __spawni_child (void *arguments)
 	      if (__chdir (action->action.chdir_action.path) != 0)
 		goto fail;
 	      break;
+
+	    case spawn_do_fchdir:
+	      if (__fchdir (action->action.fchdir_action.fd) != 0)
+		goto fail;
+	      break;
 	    }
 	}
     }
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index 3b175f104b..52e65c5020 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -1896,6 +1896,7 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index 1b57710477..dccc15bb67 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2147,3 +2147,4 @@  GLIBC_2.28 thrd_equal F
 GLIBC_2.28 thrd_sleep F
 GLIBC_2.28 thrd_yield F
 GLIBC_2.29 posix_spawn_file_actions_addchdir_np F
+GLIBC_2.29 posix_spawn_file_actions_addfchdir_np F