@@ -14,6 +14,14 @@ Major new features:
constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
+* The function _Fork has been added as a async-signal-safe fork
+ replacement since Austin Group issue 62 droped the async-signal-safe
+ requirement for fork (and it will be included in the future POSIX
+ standard). The new _Fork symbol does not issue any atfork handler neither
+ reset any internal state or lock (such as the malloc one) and only
+ setup a minimal state required to call async-signal-safe functions (such
+ as raise or execve). This function is currently a GNU extension.
+
Deprecated and removed features, and other changes affecting compatibility:
[Add deprecations, removals and changes affecting compatibility here]
@@ -31,6 +31,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
tst-malloc-backtrace tst-malloc-thread-exit \
tst-malloc-thread-fail tst-malloc-fork-deadlock \
tst-mallocfork2 \
+ tst-mallocfork3 \
tst-interpose-nothread \
tst-interpose-thread \
tst-alloc_buffer \
@@ -110,6 +111,8 @@ libmemusage-inhibit-o = $(filter-out .os,$(object-suffixes))
$(objpfx)tst-malloc-backtrace: $(shared-thread-library)
$(objpfx)tst-malloc-thread-exit: $(shared-thread-library)
$(objpfx)tst-malloc-thread-fail: $(shared-thread-library)
+$(objpfx)tst-mallocfork3: $(shared-thread-library)
+$(objpfx)tst-mallocfork3-mcheck: $(shared-thread-library)
$(objpfx)tst-malloc-fork-deadlock: $(shared-thread-library)
$(objpfx)tst-malloc-stats-cancellation: $(shared-thread-library)
$(objpfx)tst-malloc-backtrace-mcheck: $(shared-thread-library)
new file mode 100644
@@ -0,0 +1,213 @@
+/* Test case for async-signal-safe _Fork (with respect to malloc).
+ Copyright (C) 2021 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; see the file COPYING.LIB. If
+ not, see <https://www.gnu.org/licenses/>. */
+
+/* This test is similar to tst-mallocfork2.c, but specifically stress
+ the async-signal-safeness of _Fork on multithread environment. */
+
+#include <array_length.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/xsignal.h>
+#include <support/xthread.h>
+#include <support/xunistd.h>
+#include <sys/wait.h>
+
+/* How many malloc objects to keep arond. */
+enum { malloc_objects = 1009 };
+
+/* The maximum size of an object. */
+enum { malloc_maximum_size = 70000 };
+
+/* How many iterations the test performs before exiting. */
+enum { iterations = 10000 };
+
+/* Barrier for synchronization with the threads sending SIGUSR1
+ signals, to make it more likely that the signals arrive during a
+ fork/free/malloc call. */
+static pthread_barrier_t barrier;
+
+/* Set to 1 if SIGUSR1 is received. Used to detect a signal during
+ fork/free/malloc. */
+static volatile sig_atomic_t sigusr1_received;
+
+/* Periodically set to 1, to indicate that the thread is making
+ progress. Checked by liveness_signal_handler. */
+static volatile sig_atomic_t progress_indicator = 1;
+
+/* Set to 1 if an error occurs in the signal handler. */
+static volatile sig_atomic_t error_indicator = 0;
+
+static void
+sigusr1_handler (int signo)
+{
+ sigusr1_received = 1;
+
+ /* Perform a fork with a trivial subprocess. */
+ pid_t pid = _Fork ();
+ if (pid == -1)
+ {
+ write_message ("error: fork\n");
+ error_indicator = 1;
+ return;
+ }
+ if (pid == 0)
+ _exit (0);
+ int status;
+ int ret = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
+ if (ret < 0)
+ {
+ write_message ("error: waitpid\n");
+ error_indicator = 1;
+ return;
+ }
+ if (status != 0)
+ {
+ write_message ("error: unexpected exit status from subprocess\n");
+ error_indicator = 1;
+ return;
+ }
+}
+
+static void
+liveness_signal_handler (int signo)
+{
+ if (progress_indicator)
+ progress_indicator = 0;
+ else
+ write_message ("warning: thread seems to be stuck\n");
+}
+
+struct signal_send_args
+{
+ pthread_t target;
+ int signo;
+ bool sleep;
+};
+#define SIGNAL_SEND_GET_ARG(arg, field) \
+ (((struct signal_send_args *)(arg))->field)
+
+/* Send SIGNO to the parent thread. If SLEEP, wait a second between
+ signals, otherwise use barriers to delay sending signals. */
+static void *
+signal_sender (void *args)
+{
+ int signo = SIGNAL_SEND_GET_ARG (args, signo);
+ bool sleep = SIGNAL_SEND_GET_ARG (args, sleep);
+
+ pthread_t target = SIGNAL_SEND_GET_ARG (args, target);
+ while (true)
+ {
+ if (!sleep)
+ xpthread_barrier_wait (&barrier);
+ xpthread_kill (target, signo);
+ if (sleep)
+ usleep (1 * 1000 * 1000);
+ else
+ xpthread_barrier_wait (&barrier);
+ }
+ return NULL;
+}
+
+static pthread_t sigusr1_sender[5];
+static pthread_t sigusr2_sender;
+
+static int
+do_test (void)
+{
+ xsignal (SIGUSR1, sigusr1_handler);
+ xsignal (SIGUSR2, liveness_signal_handler);
+
+ pthread_t self = pthread_self ();
+
+ struct signal_send_args sigusr2_args = { self, SIGUSR2, true };
+ sigusr2_sender = xpthread_create (NULL, signal_sender, &sigusr2_args);
+
+ /* Send SIGUSR1 signals from several threads. Hopefully, one
+ signal will hit one of the ciritical functions. Use a barrier to
+ avoid sending signals while not running fork/free/malloc. */
+ struct signal_send_args sigusr1_args = { self, SIGUSR1, false };
+ xpthread_barrier_init (&barrier, NULL,
+ array_length (sigusr1_sender) + 1);
+ for (size_t i = 0; i < array_length (sigusr1_sender); ++i)
+ sigusr1_sender[i] = xpthread_create (NULL, signal_sender, &sigusr1_args);
+
+ void *objects[malloc_objects] = {};
+ unsigned int fork_signals = 0;
+ unsigned int free_signals = 0;
+ unsigned int malloc_signals = 0;
+ unsigned int seed = 1;
+ for (int i = 0; i < iterations; ++i)
+ {
+ progress_indicator = 1;
+ int slot = rand_r (&seed) % malloc_objects;
+ size_t size = rand_r (&seed) % malloc_maximum_size;
+
+ /* Occasionally do a fork first, to catch deadlocks there as
+ well (see bug 24161). */
+ bool do_fork = (rand_r (&seed) % 7) == 0;
+
+ xpthread_barrier_wait (&barrier);
+ if (do_fork)
+ {
+ sigusr1_received = 0;
+ pid_t pid = _Fork ();
+ TEST_VERIFY_EXIT (pid != -1);
+ if (sigusr1_received)
+ ++fork_signals;
+ if (pid == 0)
+ _exit (0);
+ int status;
+ int ret = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
+ if (ret < 0)
+ FAIL_EXIT1 ("waitpid: %m");
+ TEST_COMPARE (status, 0);
+ }
+ sigusr1_received = 0;
+ free (objects[slot]);
+ if (sigusr1_received)
+ ++free_signals;
+ sigusr1_received = 0;
+ objects[slot] = malloc (size);
+ if (sigusr1_received)
+ ++malloc_signals;
+ xpthread_barrier_wait (&barrier);
+
+ if (objects[slot] == NULL || error_indicator != 0)
+ {
+ printf ("error: malloc: %m\n");
+ return 1;
+ }
+ }
+
+ /* Clean up allocations. */
+ for (int slot = 0; slot < malloc_objects; ++slot)
+ free (objects[slot]);
+
+ printf ("info: signals received during fork: %u\n", fork_signals);
+ printf ("info: signals received during free: %u\n", free_signals);
+ printf ("info: signals received during malloc: %u\n", malloc_signals);
+
+ return 0;
+}
+
+#define TIMEOUT 100
+#include <support/test-driver.c>
@@ -138,8 +138,8 @@ creating a process and making it run another program.
@cindex parent process
@cindex subprocess
A new processes is created when one of the functions
-@code{posix_spawn}, @code{fork}, or @code{vfork} is called. (The
-@code{system} and @code{popen} also create new processes internally.)
+@code{posix_spawn}, @code{fork}, @code{_Fork} or @code{vfork} is called.
+(The @code{system} and @code{popen} also create new processes internally.)
Due to the name of the @code{fork} function, the act of creating a new
process is sometimes called @dfn{forking} a process. Each new process
(the @dfn{child process} or @dfn{subprocess}) is allocated a process
@@ -155,9 +155,10 @@ limited information about why the child terminated---for example, its
exit status code.
A newly forked child process continues to execute the same program as
-its parent process, at the point where the @code{fork} call returns.
-You can use the return value from @code{fork} to tell whether the program
-is running in the parent process or the child.
+its parent process, at the point where the @code{fork} or @code{_Fork}
+call returns. You can use the return value from @code{fork} or
+@code{_Fork} to tell whether the program is running in the parent process
+or the child.
@cindex process image
Having several processes run the same program is only occasionally
@@ -249,16 +250,13 @@ It is declared in the header file @file{unistd.h}.
@deftypefun pid_t fork (void)
@standards{POSIX.1, unistd.h}
@safety{@prelim{}@mtsafe{}@asunsafe{@ascuplugin{}}@acunsafe{@aculock{}}}
-@c The nptl/.../linux implementation safely collects fork_handlers into
-@c an alloca()ed linked list and increments ref counters; it uses atomic
-@c ops and retries, avoiding locking altogether. It then takes the
-@c IO_list lock, resets the thread-local pid, and runs fork. The parent
-@c restores the thread-local pid, releases the lock, and runs parent
-@c handlers, decrementing the ref count and signaling futex wait if
-@c requested by unregister_atfork. The child bumps the fork generation,
-@c sets the thread-local pid, resets cpu clocks, initializes the robust
-@c mutex list, the stream locks, the IO_list lock, the dynamic loader
-@c lock, runs the child handlers, reseting ref counters to 1, and
+@c The posix/fork.c implementation iterates over the fork_handlers
+@c using a lock. It then takes the IO_list lock, resets the thread-local
+@c pid, and runs fork. The parent releases the lock, and runs parent
+@c handlers, and unlocks the internal lock. The child bumps the fork
+@c generation, sets the thread-local pid, resets cpu clocks, initializes
+@c the robust mutex list, the stream locks, the IO_list lock, the dynamic
+@c loader lock, runs the child handlers, reseting ref counters to 1, and
@c initializes the fork lock. These are all safe, unless atfork
@c handlers themselves are unsafe.
The @code{fork} function creates a new process.
@@ -322,6 +320,17 @@ process is cleared. (The child process inherits its mask of blocked
signals and signal actions from the parent process.)
@end itemize
+@deftypefun pid_t _Fork (void)
+@standards{GNU, unistd.h}
+@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
+The @code{_Fork} function is similar to @code{fork} but does not issue
+any atfork callback registered with @code{pthread_atfork} neither reset
+any internal state or locks (such as the malloc one) and only setup a
+minimal state required to call async-signal-safe functions (such as raise
+or execve).
+
+It is an async-signal-safe replacement of @code{fork}.
+@end deftypefun
@deftypefun pid_t vfork (void)
@standards{BSD, unistd.h}
@@ -114,7 +114,7 @@ test-srcs := globtest
tests += wordexp-test tst-exec tst-spawn tst-spawn2 tst-spawn3
endif
ifeq (yesyes,$(build-shared)$(have-thread-library))
-tests += tst-getopt-cancel
+tests += tst-getopt-cancel tst-_Fork
endif
tests-static = tst-exec-static tst-spawn-static
tests += $(tests-static)
@@ -283,6 +283,7 @@ $(objpfx)ptestcases.h: PTESTS PTESTS2C.sed
$(objpfx)runptests.o: $(objpfx)ptestcases.h
$(objpfx)tst-getopt-cancel: $(shared-thread-library)
+$(objpfx)tst-_Fork: $(shared-thread-library)
test-xfail-annexc = yes
$(objpfx)annexc.out: $(objpfx)annexc
@@ -147,6 +147,9 @@ libc {
}
GLIBC_2.30 {
}
+ GLIBC_2.34 {
+ _Fork;
+ }
GLIBC_PRIVATE {
__libc_fork; __libc_pread; __libc_pwrite;
__nanosleep_nocancel; __pause_nocancel;
@@ -40,8 +40,10 @@ __libc_fork (void)
{
/* Determine if we are running multiple threads. We skip some fork
handlers in the single-thread case, to make fork safer to use in
- signal handlers. POSIX requires that fork is async-signal-safe,
- but our current fork implementation is not. */
+ signal handlers. Although POSIX has dropped async-signal-safe
+ requirement for fork (Austin Group tracker issue #62) this is
+ best effort to make is async-signal-safe at least for single-thread
+ case. */
bool multiple_threads = __libc_single_threaded == 0;
__run_fork_handlers (atfork_run_prepare, multiple_threads);
new file mode 100644
@@ -0,0 +1,218 @@
+/* Basic tests for _Fork.
+ Copyright (C) 2021 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 <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <support/check.h>
+#include <support/xsignal.h>
+#include <support/temp_file.h>
+#include <support/xunistd.h>
+#include <support/xthread.h>
+
+/* For single-thread, _Fork behaves like fork. */
+static int
+singlethread_test (void)
+{
+ const char testdata1[] = "abcdefghijklmnopqrtuvwxz";
+ enum { testdatalen1 = array_length (testdata1) };
+ const char testdata2[] = "01234567890";
+ enum { testdatalen2 = array_length (testdata2) };
+
+ pid_t ppid = getpid ();
+
+ int tempfd = create_temp_file ("tst-_Fork", NULL);
+
+ /* Check if the opened file is shared between process by read and write
+ some data on parent and child processes. */
+ xwrite (tempfd, testdata1, testdatalen1);
+ off_t off = xlseek (tempfd, 0, SEEK_CUR);
+ TEST_COMPARE (off, testdatalen1);
+
+ pid_t pid = _Fork ();
+ TEST_VERIFY_EXIT (pid != -1);
+ if (pid == 0)
+ {
+ TEST_VERIFY_EXIT (getpid () != ppid);
+ TEST_COMPARE (getppid(), ppid);
+
+ TEST_COMPARE (xlseek (tempfd, 0, SEEK_CUR), testdatalen1);
+
+ xlseek (tempfd, 0, SEEK_SET);
+ char buf[testdatalen1];
+ TEST_COMPARE (read (tempfd, buf, sizeof (buf)), testdatalen1);
+ TEST_COMPARE (memcmp (buf, testdata1, testdatalen1), 0);
+
+ xlseek (tempfd, 0, SEEK_SET);
+ xwrite (tempfd, testdata2, testdatalen2);
+
+ close (tempfd);
+
+ _exit (EXIT_SUCCESS);
+ }
+
+ int status;
+ xwaitpid (pid, &status, 0);
+ TEST_VERIFY (WIFEXITED (status));
+ TEST_COMPARE (WEXITSTATUS (status), EXIT_SUCCESS);
+
+ TEST_COMPARE (xlseek (tempfd, 0, SEEK_CUR), testdatalen2);
+
+ xlseek (tempfd, 0, SEEK_SET);
+ char buf[testdatalen2];
+ TEST_COMPARE (read (tempfd, buf, sizeof (buf)), testdatalen2);
+
+ TEST_COMPARE (memcmp (buf, testdata2, testdatalen2), 0);
+
+ return 0;
+}
+
+
+static volatile sig_atomic_t sigusr1_handler_ran;
+static pid_t sig_pid = -1;
+#define SIG_PID_EXIT_CODE 20
+
+static void
+sigusr1_handler (int signum)
+{
+ TEST_COMPARE (signum, SIGUSR1);
+
+ pid_t ppid = getpid ();
+
+ sig_pid = _Fork ();
+ TEST_VERIFY_EXIT (sig_pid != -1);
+ if (sig_pid == 0)
+ {
+ TEST_VERIFY_EXIT (getpid () != ppid);
+ TEST_COMPARE (getppid(), ppid);
+
+ _exit (SIG_PID_EXIT_CODE);
+ }
+
+ sigusr1_handler_ran = 1;
+}
+
+/* _Fork is async-signal-safe, so check if it can successfully issue
+ a new process in a signal handler. */
+static int
+singlethread_signal_test (void)
+{
+ xsignal (SIGUSR1, &sigusr1_handler);
+ /* Assume synchronous signal handling. */
+ xraise (SIGUSR1);
+ TEST_COMPARE (sigusr1_handler_ran, 1);
+
+ int status;
+ xwaitpid (sig_pid, &status, 0);
+ TEST_VERIFY (WIFEXITED (status));
+ TEST_COMPARE (WEXITSTATUS (status), SIG_PID_EXIT_CODE);
+
+ xsignal (SIGUSR1, SIG_DFL);
+
+ return 0;
+}
+
+
+static bool atfork_prepare_var;
+static bool atfork_parent_var;
+static bool atfork_child_var;
+
+static void
+atfork_prepare (void)
+{
+ atfork_prepare_var = true;
+}
+
+static void
+atfork_parent (void)
+{
+ atfork_parent_var = true;
+}
+
+static void
+atfork_child (void)
+{
+ atfork_child_var = true;
+}
+
+/* Different than fork, _Fork does not execute any pthread_atfork
+ handlers. */
+static int
+singlethread_atfork_test (void)
+{
+ pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
+ singlethread_test ();
+ TEST_COMPARE (atfork_prepare_var, false);
+ TEST_COMPARE (atfork_parent_var, false);
+ TEST_COMPARE (atfork_child_var, false);
+
+ return 0;
+}
+
+
+static void *
+mt_atfork_test (void *args)
+{
+ singlethread_atfork_test ();
+
+ return NULL;
+}
+
+static int
+multithread_atfork_test (void)
+{
+ pthread_t thr = xpthread_create (NULL, mt_atfork_test, NULL);
+ xpthread_join (thr);
+
+ return 0;
+}
+
+
+static void *
+mt_signal_test (void *args)
+{
+ singlethread_signal_test ();
+
+ return NULL;
+}
+
+static int
+multithread_signal_test (void)
+{
+ pthread_t thr = xpthread_create (NULL, mt_signal_test, NULL);
+ xpthread_join (thr);
+
+ return 0;
+}
+
+
+static int
+do_test (void)
+{
+ singlethread_atfork_test ();
+ singlethread_signal_test ();
+
+ multithread_atfork_test ();
+ multithread_signal_test ();
+
+ return 0;
+}
+
+#include <support/test-driver.c>
@@ -776,6 +776,13 @@ extern __pid_t fork (void) __THROWNL;
extern __pid_t vfork (void) __THROW;
#endif /* Use misc or XPG < 7. */
+#ifdef __USE_GNU
+/* This is similar to fork, however it does not run the atfork handlers
+ neither reinitialize any internal locks in multithread case.
+ Different than fork, _Fork is async-signal-safe. */
+extern __pid_t _Fork (void) __THROWNL;
+#endif
+
/* Return the pathname of the terminal FD is open on, or NULL on errors.
The returned storage is good only until the next call to this function. */
@@ -2203,6 +2203,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2171,3 +2171,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -2253,6 +2253,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -1931,3 +1931,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -155,6 +155,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -152,6 +152,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -2115,3 +2115,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -2074,6 +2074,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2241,6 +2241,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2106,6 +2106,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -156,6 +156,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0x98
GLIBC_2.4 _IO_2_1_stdin_ D 0x98
@@ -2186,6 +2186,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2166,3 +2166,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -2163,3 +2163,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -2157,6 +2157,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2155,6 +2155,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2163,6 +2163,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2157,6 +2157,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2204,3 +2204,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -2213,6 +2213,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2246,6 +2246,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2076,6 +2076,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2366,3 +2366,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -1933,3 +1933,4 @@ GLIBC_2.33 wprintf F
GLIBC_2.33 write F
GLIBC_2.33 writev F
GLIBC_2.33 wscanf F
+GLIBC_2.34 _Fork F
@@ -2133,3 +2133,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
@@ -2211,6 +2211,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2112,6 +2112,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2081,6 +2081,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2078,6 +2078,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2202,6 +2202,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2129,6 +2129,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2088,6 +2088,7 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2185,3 +2185,4 @@ GLIBC_2.33 mknod F
GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
+GLIBC_2.34 _Fork F