stdio-common: Add the fgetln function

diff --git a/NEWS b/NEWS
index ef8ac4acd2..f3fcd4edb5 100644
--- a/NEWS
+++ b/NEWS
@@ -16,6 +16,9 @@  Major new features:
   -z pack-relative-relocs option, which is supported for some targets
   in recent binutils versions.  Lazy binding doesn't apply to DT_RELR.
 
+* The fgetln line reading function has been added, based on the BSD
+  function of the same name.
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * Support for prelink will be removed in the next release; this includes
diff --git a/libio/bits/types/struct_FILE.h b/libio/bits/types/struct_FILE.h
index 1eb429888c..732df4c73d 100644
--- a/libio/bits/types/struct_FILE.h
+++ b/libio/bits/types/struct_FILE.h
@@ -92,10 +92,10 @@  struct _IO_FILE_complete
   struct _IO_wide_data *_wide_data;
   struct _IO_FILE *_freeres_list;
   void *_freeres_buf;
-  size_t __pad5;
+  char *_fgetln_buf;
   int _mode;
   /* Make sure we don't get into trouble again.  */
-  char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
+  char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (char *)];
 };
 
 /* These macros are used by bits/stdio.h and internal headers.  */
diff --git a/libio/genops.c b/libio/genops.c
index 1b629eb695..f61dacaefd 100644
--- a/libio/genops.c
+++ b/libio/genops.c
@@ -585,6 +585,7 @@  _IO_no_init (FILE *fp, int flags, int orientation,
        stream.  */
     fp->_wide_data = (struct _IO_wide_data *) -1L;
   fp->_freeres_list = NULL;
+  fp->_fgetln_buf = NULL;
 }
 
 int
diff --git a/libio/iofclose.c b/libio/iofclose.c
index 4191eb8cea..5c5b3236a0 100644
--- a/libio/iofclose.c
+++ b/libio/iofclose.c
@@ -71,6 +71,7 @@  _IO_new_fclose (FILE *fp)
       if (_IO_have_backup (fp))
 	_IO_free_backup_area (fp);
     }
+  free (fp->_fgetln_buf);
   _IO_deallocate_file (fp);
   return status;
 }
diff --git a/libio/stdio.h b/libio/stdio.h
index e6425341ce..d438bd00e2 100644
--- a/libio/stdio.h
+++ b/libio/stdio.h
@@ -645,6 +645,15 @@  extern __ssize_t getdelim (char **__restrict __lineptr,
 extern __ssize_t getline (char **__restrict __lineptr,
                           size_t *__restrict __n,
                           FILE *__restrict __stream) __wur;
+#endif /* __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) */
+
+#ifdef __USE_MISC
+/* Reads the next line from STREAM and returns a pointer to the start of
+   an array containing it.  The array is not null-terminated.  The
+   length of the array, including the line terminator if present in
+   the input, is written to *LENGTH.  Returns NULL on EOF and failure.
+   Subsequent operations on STREAM invalidate the returned pointer.  */
+extern char *fgetln (FILE *__stream, size_t *__length) __wur;
 #endif
 
 
diff --git a/manual/stdio.texi b/manual/stdio.texi
index 753c50920d..04ce4f6a0e 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -1365,6 +1365,38 @@  function except that it does not implicitly lock the stream.
 This function is a GNU extension.
 @end deftypefun
 
+@deftypefun {char *} fgetln (FILE *@var{stream}, size_t *@var{length})
+@standards{BSD, unistd.h}
+@safety{@mtsafe{@mtsrace{:stream}}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{}}}
+The @code{fgetln} function reads a line from @var{stream}, writes the
+length of the line to @code{@var{length}}, and returns a pointer to the
+start of a character array containing the line contents.  The length
+includes the line terminator if present in the stream.  (The last line
+of a file may lack a line terminator.)
+
+If the function encounters the end of stream before reading any
+characters or an error, a null pointer is returned, and zero is written
+to @code{*@var{length}}.  You can use @code{feof} and @code{ferror} to
+disambiguate the two cases.
+
+The returned pointer does not point to a string: the array is not
+null-terminated.  The pointer and the array are invalidated by a
+subsequent operation on @var{stream}.  The @code{fgetln} function does
+not perform locking.  If the caller needs locking, it has to call
+@code{flockfile} explicitly.  @xref{Streams and Threads}.
+
+The @code{fgetln} function is a BSD extension.  The comparable
+@code{getline} function is slightly less efficient on buffered streams,
+but it can be easier to use because the allocated string is
+null-terminated and not invalidated by unrelated operations on
+@var{stream}.  BSD specifies that the first @code{*@var{length}} bytes
+of the character array are writable.  In @theglibc{} implementation,
+this is not necessarily the case for some stream types, such as
+read-only memory-mapped files created by the @code{fopen} function with
+an @code{"rm"} mode argument.
+@xref{Opening Streams}.
+@end deftypefun
+
 @deftypefn {Deprecated function} {char *} gets (char *@var{s})
 @standards{ISO, stdio.h}
 @safety{@prelim{}@mtsafe{}@asunsafe{@asucorrupt{}}@acunsafe{@aculock{} @acucorrupt{}}}
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index a1603e82fe..3577c8d8ad 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -31,6 +31,7 @@  routines := \
   ctermid \
   cuserid \
   dprintf \
+  fgetln \
   flockfile \
   fprintf \
   fscanf \
@@ -161,6 +162,7 @@  tests := \
   tst-cookie \
   tst-fdopen \
   tst-ferror \
+  tst-fgetln \
   tst-fgets \
   tst-fileno \
   tst-fmemopen \
diff --git a/stdio-common/Versions b/stdio-common/Versions
index 522f302198..c1bb41acef 100644
--- a/stdio-common/Versions
+++ b/stdio-common/Versions
@@ -63,6 +63,9 @@  libc {
   GLIBC_2.29 {
     # SHLIB_COMPAT(GLIBC_2_0, GLIBC_2_29) used in iovfscanf.c etc.
   }
+  GLIBC_2.36 {
+    fgetln;
+  }
   GLIBC_PRIVATE {
     # global variables
     _itoa_lower_digits;
diff --git a/stdio-common/fgetln.c b/stdio-common/fgetln.c
new file mode 100644
index 0000000000..70cf684f43
--- /dev/null
+++ b/stdio-common/fgetln.c
@@ -0,0 +1,82 @@ 
+/* Zero-copy line reading function.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include "libioP.h"
+#include <errno.h>
+#include <shlib-compat.h>
+#include <stddef.h>
+#include <string.h>
+
+char *
+__fgetln (FILE *fp, size_t *length)
+{
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
+  /* There is no fgetln support for old streams.  */
+  if (_IO_vtable_offset (fp) != 0)
+    {
+      *length = 0;
+      __set_errno (EOPNOTSUPP);
+      return NULL;
+    }
+#endif
+
+  /* Discard the old buffer.  This optimizes for a buffered stream,
+     with multiple lines in each buffer.  */
+  if (fp->_fgetln_buf != NULL)
+    {
+      free (fp->_fgetln_buf);
+      fp->_fgetln_buf = NULL;
+    }
+
+  /* Fast path if there is a read buffer.  */
+  if (fp->_IO_read_ptr < fp->_IO_read_end)
+    {
+      char *nl = memchr (fp->_IO_read_ptr, '\n',
+                         fp->_IO_read_end - fp->_IO_read_ptr);
+      if (nl != NULL)
+        {
+          /* The line terminator was found.  Consume the line and
+             return it.  */
+          char *result = fp->_IO_read_ptr;
+          ++nl;
+          fp->_IO_read_ptr = nl;
+          *length = nl - result;
+          return result;
+        }
+      /* Fall through to the slow path.  */
+    }
+
+  /* In the slow path, just use getdelim.  __uflow would perhaps
+     re-fill the buffer without an allocation, but it also consumes a
+     character, and that would have to be somehow merged with the rest
+     of the line (if it is not possible to unread it in the same
+     buffer).  */
+  size_t allocated = 0;
+  ssize_t ret = __getdelim (&fp->_fgetln_buf, &allocated, '\n', fp);
+  if (ret <= 0)
+    {
+      free (fp->_fgetln_buf);
+      fp->_fgetln_buf = NULL;
+      ret = 0;
+    }
+  *length = ret;
+  return fp->_fgetln_buf;
+}
+
+
+weak_alias (__fgetln, fgetln)
diff --git a/stdio-common/tst-fgetln.c b/stdio-common/tst-fgetln.c
new file mode 100644
index 0000000000..e7633a9eda
--- /dev/null
+++ b/stdio-common/tst-fgetln.c
@@ -0,0 +1,179 @@ 
+/* Test the fgetln function.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <array_length.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdio.h>
+#include <support/check.h>
+
+struct expected_line
+{
+  const char *contents;
+  size_t length;
+};
+
+static void
+check_lines (FILE *fp, const struct expected_line *expected)
+{
+  for (size_t i = 0; expected[i].contents != NULL; ++i)
+    {
+      size_t line_length;
+      char *line = fgetln (fp, &line_length);
+      if (line == NULL)
+        FAIL_EXIT1 ("failure to read line %zu (feof=%d ferror=%d)",
+                    i, feof (fp), ferror (fp));
+      TEST_COMPARE_BLOB (expected[i].contents, expected[i].length,
+                         line, line_length);
+    }
+
+  size_t line_length;
+  TEST_VERIFY (fgetln (fp, &line_length) == NULL);
+  TEST_VERIFY (feof (fp));
+  TEST_VERIFY (!ferror (fp));
+}
+
+static void
+check_popen (const char *command,
+             const struct expected_line *expected)
+{
+  char file_buffer[8];
+
+  for (int do_file_redirect = 0; do_file_redirect < 2; ++do_file_redirect)
+    for (int buffering = 0; buffering < 4; ++buffering)
+      {
+        FILE *fp = popen (command, "r");
+        if (fp == NULL)
+          FAIL_EXIT1 ("popen: %m");
+
+        if (do_file_redirect)
+          {
+            /* Copy the data to a temporary file, and use that stream
+               instead.  */
+            FILE *tmpfp = tmpfile ();
+            if (tmpfp == NULL)
+              FAIL_EXIT1 ("tmpfile: %m");
+            while (true)
+              {
+                int ch = fgetc (fp);
+                if (ch == EOF)
+                  {
+                    TEST_VERIFY (!ferror (fp));
+                    break;
+                  }
+                fputc (ch, tmpfp);
+                TEST_VERIFY (!ferror (fp));
+              }
+
+            TEST_COMPARE (fflush (tmpfp), 0);
+            rewind (tmpfp);
+            TEST_COMPARE (pclose (fp), 0);
+            fp = tmpfp;
+          }
+
+        switch (buffering)
+          {
+          case 0:
+            /* Use default.  */
+            break;
+          case 1:
+            /* Unbuffered.  */
+            TEST_COMPARE (setvbuf (fp, NULL, _IONBF, 0), 0);
+            break;
+
+          case 2:
+            /* Small buffer.  */
+            TEST_COMPARE (setvbuf (fp, file_buffer, _IOFBF,
+                                   sizeof (file_buffer) / 2),
+                          0);
+            break;
+          case 3:
+            /* Slightly larger buffer.  */
+            TEST_COMPARE (setvbuf (fp, file_buffer, _IOFBF,
+                                   sizeof (file_buffer)),
+                          0);
+            break;
+          }
+
+        check_lines (fp, expected);
+
+        if (do_file_redirect)
+          TEST_COMPARE (fclose (fp), 0);
+        else
+          TEST_COMPARE (pclose (fp), 0);
+      }
+}
+
+static int
+do_test (void)
+{
+  check_popen ("exit 0", (const struct expected_line[]) { { } });
+  check_popen ("echo", (const struct expected_line[])
+               {
+                 { "\n", 1 },
+                 { }
+               });
+  check_popen ("echo Abc; echo Defg", (const struct expected_line[])
+               {
+                 { "Abc\n", 4 },
+                 { "Defg\n", 5 },
+                 { }
+               });
+  check_popen ("printf 'aBc\ndEfg'", (const struct expected_line[])
+               {
+                 { "aBc\n", 4 },
+                 { "dEfg", 4 },
+                 { }
+               });
+  check_popen ("printf 'abC123\ndeFg'", (const struct expected_line[])
+               {
+                 { "abC123\n", 7 },
+                 { "deFg", 4 },
+                 { }
+               });
+  check_popen ("printf 'AbC123\nDeFg4\n56\n'", (const struct expected_line[])
+               {
+                 { "AbC123\n", 7 },
+                 { "DeFg4\n", 6 },
+                 { "56\n", 3 },
+                 { }
+               });
+  check_popen ("printf 'AbC123.\nDeFg4.\n56.\n78.\n'",
+               (const struct expected_line[])
+               {
+                 { "AbC123.\n", 8 },
+                 { "DeFg4.\n", 7 },
+                 { "56.\n", 4 },
+                 { "78.\n", 4 },
+                 { }
+               });
+   check_popen ("printf 'ABC123.\nDEF\\000g4.\n56.\n78.\n'",
+               (const struct expected_line[])
+               {
+                 { "ABC123.\n", 8 },
+                 { "DEF\000g4.\n", 8 },
+                 { "56.\n", 4 },
+                 { "78.\n", 4 },
+                 { }
+               });
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index 4dc87e9061..3821886da2 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2289,6 +2289,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 close_range F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 1b63d9e447..0e09f9a07c 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2616,3 +2616,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index e7e4cf7d2a..c1611d7328 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2713,6 +2713,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
index bc3d228e31..23fc47a635 100644
--- a/sysdeps/unix/sysv/linux/arc/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
@@ -2377,3 +2377,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
index db7039c4ab..dffe4a4c0c 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -496,6 +496,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln 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/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index d2add4fb49..2124ee46d7 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -493,6 +493,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln 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/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
index 355d72a30c..901746d3ad 100644
--- a/sysdeps/unix/sysv/linux/csky/libc.abilist
+++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
@@ -2652,3 +2652,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index 3df39bb28c..be6dda0b5c 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2601,6 +2601,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index c4da358f80..890ba30894 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2785,6 +2785,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index 241bac70ea..7d9b2c75c0 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -2551,6 +2551,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 78bf372b72..7414ca5958 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -497,6 +497,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln 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 00df5c901f..e778ca0c85 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2728,6 +2728,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
index e8118569c3..0dee439dcf 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
@@ -2701,3 +2701,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
index c0d2373e64..b29a1bf658 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
@@ -2698,3 +2698,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index 2d0fd04f54..7a8c35382f 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2693,6 +2693,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index e39ccfb312..57c6d61ef3 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2691,6 +2691,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index 1e900f86e4..aa7d911708 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2699,6 +2699,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index 9145ba7931..718dde5d74 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -2602,6 +2602,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index e95d60d926..e84a1dae24 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2740,3 +2740,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist
index ca934e374b..c6d70f8605 100644
--- a/sysdeps/unix/sysv/linux/or1k/libc.abilist
+++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist
@@ -2123,3 +2123,4 @@  GLIBC_2.35 wprintf F
 GLIBC_2.35 write F
 GLIBC_2.35 writev F
 GLIBC_2.35 wscanf F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index 3820b9f235..4d980a48af 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -2755,6 +2755,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index 464dc27fcd..6e3dc8c2af 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -2788,6 +2788,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
index 2f7e58747f..8589c86e8d 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
@@ -2510,6 +2510,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
index 4f3043d913..775b77c5b0 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
@@ -2812,3 +2812,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
index 84b6ac815a..d7c5700468 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
@@ -2379,3 +2379,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index 4d5c19c56a..c3649699e6 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2579,3 +2579,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index 7c5ee8d569..6689b28a7b 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -2753,6 +2753,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index 50de0b46cf..95e55f8366 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -2547,6 +2547,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
index 66fba013ca..94d7b43bce 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
@@ -2608,6 +2608,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
index 38703f8aa0..dd348b1bd5 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
@@ -2605,6 +2605,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 6df55eb765..821ed2415b 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -2748,6 +2748,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index b90569d881..4ee94b6df9 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -2574,6 +2574,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index e88b0f101f..bb31ad0d09 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -2525,6 +2525,7 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index e0755272eb..b458cae553 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2631,3 +2631,4 @@  GLIBC_2.35 __memcmpeq F
 GLIBC_2.35 _dl_find_object F
 GLIBC_2.35 epoll_pwait2 F
 GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
+GLIBC_2.36 fgetln F