/* Waiting for a subprocess to finish.
- Copyright (C) 2001-2003 Free Software Foundation, Inc.
+ Copyright (C) 2001-2003, 2005-2014 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include <config.h>
/* Specification. */
#include "wait-process.h"
#include <signal.h>
#include <sys/types.h>
-
-#if defined _MSC_VER || defined __MINGW32__
-
-/* Native Woe32 API. */
-#include <process.h>
-#define waitpid(pid,statusp,options) _cwait (statusp, pid, WAIT_CHILD)
-#define WAIT_T int
-#define WTERMSIG(x) ((x) & 0xff) /* or: SIGABRT ?? */
-#define WCOREDUMP(x) 0
-#define WEXITSTATUS(x) (((x) >> 8) & 0xff) /* or: (x) ?? */
-#define WIFSIGNALED(x) (WTERMSIG (x) != 0) /* or: ((x) == 3) ?? */
-#define WIFEXITED(x) (WTERMSIG (x) == 0) /* or: ((x) != 3) ?? */
-#define WIFSTOPPED(x) 0
-
-#else
-
-/* Unix API. */
#include <sys/wait.h>
-/* On Linux, WEXITSTATUS are bits 15..8 and WTERMSIG are bits 7..0, while
- BeOS uses the contrary. Therefore we use the abstract macros. */
-#if HAVE_UNION_WAIT
-# define WAIT_T union wait
-# ifndef WTERMSIG
-# define WTERMSIG(x) ((x).w_termsig)
-# endif
-# ifndef WCOREDUMP
-# define WCOREDUMP(x) ((x).w_coredump)
-# endif
-# ifndef WEXITSTATUS
-# define WEXITSTATUS(x) ((x).w_retcode)
-# endif
-#else
-# define WAIT_T int
-# ifndef WTERMSIG
-# define WTERMSIG(x) ((x) & 0x7f)
-# endif
-# ifndef WCOREDUMP
-# define WCOREDUMP(x) ((x) & 0x80)
-# endif
-# ifndef WEXITSTATUS
-# define WEXITSTATUS(x) (((x) >> 8) & 0xff)
-# endif
-#endif
-/* For valid x, exactly one of WIFSIGNALED(x), WIFEXITED(x), WIFSTOPPED(x)
- is true. */
-#ifndef WIFSIGNALED
-# define WIFSIGNALED(x) (WTERMSIG (x) != 0 && WTERMSIG(x) != 0x7f)
-#endif
-#ifndef WIFEXITED
-# define WIFEXITED(x) (WTERMSIG (x) == 0)
-#endif
-#ifndef WIFSTOPPED
-# define WIFSTOPPED(x) (WTERMSIG (x) == 0x7f)
-#endif
-/* Note that portable applications may access
- WTERMSIG(x) only if WIFSIGNALED(x) is true, and
- WEXITSTATUS(x) only if WIFEXITED(x) is true. */
-
-#endif
#include "error.h"
-#include "exit.h"
#include "fatal-signal.h"
#include "xalloc.h"
#include "gettext.h"
#define SIZEOF(a) (sizeof(a) / sizeof(a[0]))
+#if defined _MSC_VER || defined __MINGW32__
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+/* The return value of spawnvp() is really a process handle as returned
+ by CreateProcess(). Therefore we can kill it using TerminateProcess. */
+#define kill(pid,sig) TerminateProcess ((HANDLE) (pid), sig)
+
+#endif
+
+
/* Type of an entry in the slaves array.
The 'used' bit determines whether this entry is currently in use.
(If pid_t was an atomic type like sig_atomic_t, we could just set the
/* The cleanup action. It gets called asynchronously. */
static void
-cleanup_slaves ()
+cleanup_slaves (void)
{
for (;;)
{
/* Get the last registered slave. */
size_t n = slaves_count;
if (n == 0)
- break;
+ break;
n--;
slaves_count = n;
/* Skip unused entries in the slaves array. */
if (slaves[n].used)
- {
- pid_t slave = slaves[n].child;
+ {
+ pid_t slave = slaves[n].child;
- /* Kill the slave. */
- kill (slave, TERMINATOR);
- }
+ /* Kill the slave. */
+ kill (slave, TERMINATOR);
+ }
}
}
for (; s < s_end; s++)
if (!s->used)
- {
- /* The two uses of 'volatile' in the slaves_entry_t type above
- (and ISO C 99 section 5.1.2.3.(5)) ensure that we mark the
- entry as used only after the child pid has been written to the
- memory location s->child. */
- s->child = child;
- s->used = 1;
- return;
- }
+ {
+ /* The two uses of 'volatile' in the slaves_entry_t type above
+ (and ISO C 99 section 5.1.2.3.(5)) ensure that we mark the
+ entry as used only after the child pid has been written to the
+ memory location s->child. */
+ s->child = child;
+ s->used = 1;
+ return;
+ }
}
if (slaves_count == slaves_allocated)
{
/* Extend the slaves array. Note that we cannot use xrealloc(),
- because then the cleanup_slaves() function could access an already
- deallocated array. */
+ because then the cleanup_slaves() function could access an already
+ deallocated array. */
slaves_entry_t *old_slaves = slaves;
size_t new_slaves_allocated = 2 * slaves_allocated;
slaves_entry_t *new_slaves =
- malloc (new_slaves_allocated * sizeof (slaves_entry_t));
+ (slaves_entry_t *)
+ malloc (new_slaves_allocated * sizeof (slaves_entry_t));
if (new_slaves == NULL)
- {
- /* xalloc_die() will call exit() which will invoke cleanup_slaves().
- Additionally we need to kill child, because it's not yet among
- the slaves list. */
- kill (child, TERMINATOR);
- xalloc_die ();
- }
+ {
+ /* xalloc_die() will call exit() which will invoke cleanup_slaves().
+ Additionally we need to kill child, because it's not yet among
+ the slaves list. */
+ kill (child, TERMINATOR);
+ xalloc_die ();
+ }
memcpy (new_slaves, old_slaves,
- slaves_allocated * sizeof (slaves_entry_t));
+ slaves_allocated * sizeof (slaves_entry_t));
slaves = new_slaves;
slaves_allocated = new_slaves_allocated;
/* Now we can free the old slaves array. */
if (old_slaves != static_slaves)
- free (old_slaves);
+ free (old_slaves);
}
/* The three uses of 'volatile' in the types above (and ISO C 99 section
5.1.2.3.(5)) ensure that we increment the slaves_count only after the
}
/* Unregister a child from the list of slave subprocesses. */
-static inline void
+static void
unregister_slave_subprocess (pid_t child)
{
/* The easiest way to remove an entry from a list that can be used by
return 127. */
int
wait_subprocess (pid_t child, const char *progname,
- bool null_stderr,
- bool slave_process, bool exit_on_error)
+ bool ignore_sigpipe, bool null_stderr,
+ bool slave_process, bool exit_on_error,
+ int *termsigp)
{
+#if HAVE_WAITID && defined WNOWAIT && 0
+ /* Commented out because waitid() without WEXITED and with WNOWAIT doesn't
+ work: On Solaris 7 and OSF/1 4.0, it returns -1 and sets errno = ECHILD,
+ and on HP-UX 10.20 it just hangs. */
+ /* Use of waitid() with WNOWAIT avoids a race condition: If slave_process is
+ true, and this process sleeps a very long time between the return from
+ waitpid() and the execution of unregister_slave_subprocess(), and
+ meanwhile another process acquires the same PID as child, and then - still
+ before unregister_slave_subprocess() - this process gets a fatal signal,
+ it would kill the other totally unrelated process. */
+ siginfo_t info;
+
+ if (termsigp != NULL)
+ *termsigp = 0;
+ for (;;)
+ {
+ if (waitid (P_PID, child, &info, WEXITED | (slave_process ? WNOWAIT : 0))
+ < 0)
+ {
+# ifdef EINTR
+ if (errno == EINTR)
+ continue;
+# endif
+ if (exit_on_error || !null_stderr)
+ error (exit_on_error ? EXIT_FAILURE : 0, errno,
+ _("%s subprocess"), progname);
+ return 127;
+ }
+
+ /* info.si_code is set to one of CLD_EXITED, CLD_KILLED, CLD_DUMPED,
+ CLD_TRAPPED, CLD_STOPPED, CLD_CONTINUED. Loop until the program
+ terminates. */
+ if (info.si_code == CLD_EXITED
+ || info.si_code == CLD_KILLED || info.si_code == CLD_DUMPED)
+ break;
+ }
+
+ /* The child process has exited or was signalled. */
+
+ if (slave_process)
+ {
+ /* Unregister the child from the list of slave subprocesses, so that
+ later, when we exit, we don't kill a totally unrelated process which
+ may have acquired the same pid. */
+ unregister_slave_subprocess (child);
+
+ /* Now remove the zombie from the process list. */
+ for (;;)
+ {
+ if (waitid (P_PID, child, &info, WEXITED) < 0)
+ {
+# ifdef EINTR
+ if (errno == EINTR)
+ continue;
+# endif
+ if (exit_on_error || !null_stderr)
+ error (exit_on_error ? EXIT_FAILURE : 0, errno,
+ _("%s subprocess"), progname);
+ return 127;
+ }
+ break;
+ }
+ }
+
+ switch (info.si_code)
+ {
+ case CLD_KILLED:
+ case CLD_DUMPED:
+ if (termsigp != NULL)
+ *termsigp = info.si_status; /* TODO: or info.si_signo? */
+# ifdef SIGPIPE
+ if (info.si_status == SIGPIPE && ignore_sigpipe)
+ return 0;
+# endif
+ if (exit_on_error || (!null_stderr && termsigp == NULL))
+ error (exit_on_error ? EXIT_FAILURE : 0, 0,
+ _("%s subprocess got fatal signal %d"),
+ progname, info.si_status);
+ return 127;
+ case CLD_EXITED:
+ if (info.si_status == 127)
+ {
+ if (exit_on_error || !null_stderr)
+ error (exit_on_error ? EXIT_FAILURE : 0, 0,
+ _("%s subprocess failed"), progname);
+ return 127;
+ }
+ return info.si_status;
+ default:
+ abort ();
+ }
+#else
/* waitpid() is just as portable as wait() nowadays. */
- WAIT_T status;
+ int status;
- *(int *) &status = 0;
+ if (termsigp != NULL)
+ *termsigp = 0;
+ status = 0;
for (;;)
{
int result = waitpid (child, &status, 0);
if (result != child)
- {
-#ifdef EINTR
- if (errno == EINTR)
- continue;
-#endif
-#if 0 /* defined ECHILD */
- if (errno == ECHILD)
- {
- /* Child process nonexistent?! Assume it terminated
- successfully. */
- *(int *) &status = 0;
- break;
- }
-#endif
- if (exit_on_error || !null_stderr)
- error (exit_on_error ? EXIT_FAILURE : 0, errno,
- _("%s subprocess"), progname);
- return 127;
- }
+ {
+# ifdef EINTR
+ if (errno == EINTR)
+ continue;
+# endif
+# if 0 /* defined ECHILD */
+ if (errno == ECHILD)
+ {
+ /* Child process nonexistent?! Assume it terminated
+ successfully. */
+ status = 0;
+ break;
+ }
+# endif
+ if (exit_on_error || !null_stderr)
+ error (exit_on_error ? EXIT_FAILURE : 0, errno,
+ _("%s subprocess"), progname);
+ return 127;
+ }
/* One of WIFSIGNALED (status), WIFEXITED (status), WIFSTOPPED (status)
- must always be true. Loop until the program terminates. */
+ must always be true, since we did not specify WCONTINUED in the
+ waitpid() call. Loop until the program terminates. */
if (!WIFSTOPPED (status))
- break;
+ break;
}
/* The child process has exited or was signalled. */
if (WIFSIGNALED (status))
{
- if (exit_on_error || !null_stderr)
- error (exit_on_error ? EXIT_FAILURE : 0, 0,
- _("%s subprocess got fatal signal %d"),
- progname, (int) WTERMSIG (status));
+ if (termsigp != NULL)
+ *termsigp = WTERMSIG (status);
+# ifdef SIGPIPE
+ if (WTERMSIG (status) == SIGPIPE && ignore_sigpipe)
+ return 0;
+# endif
+ if (exit_on_error || (!null_stderr && termsigp == NULL))
+ error (exit_on_error ? EXIT_FAILURE : 0, 0,
+ _("%s subprocess got fatal signal %d"),
+ progname, (int) WTERMSIG (status));
return 127;
}
+ if (!WIFEXITED (status))
+ abort ();
if (WEXITSTATUS (status) == 127)
{
if (exit_on_error || !null_stderr)
- error (exit_on_error ? EXIT_FAILURE : 0, 0,
- _("%s subprocess failed"), progname);
+ error (exit_on_error ? EXIT_FAILURE : 0, 0,
+ _("%s subprocess failed"), progname);
return 127;
}
return WEXITSTATUS (status);
+#endif
}
projects / gnulib.git / blobdiff