131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
|
/* Wait for process to change state. Linux version.
|
||
|
|
Copyright (C) 2019-2022 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 <sys/wait.h>
|
||
|
|
#include <sys/resource.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sysdep-cancel.h>
|
||
|
|
#include <tv32-compat.h>
|
||
|
|
|
||
|
|
pid_t
|
||
|
|
__wait4_time64 (pid_t pid, int *stat_loc, int options, struct __rusage64 *usage)
|
||
|
|
{
|
||
|
|
#ifdef __NR_wait4
|
||
|
|
# if __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
|
||
|
|
return SYSCALL_CANCEL (wait4, pid, stat_loc, options, usage);
|
||
|
|
# else
|
||
|
|
pid_t ret;
|
||
|
|
struct __rusage32 usage32;
|
||
|
|
|
||
|
|
ret = SYSCALL_CANCEL (wait4, pid, stat_loc, options,
|
||
|
|
usage != NULL ? &usage32 : NULL);
|
||
|
|
|
||
|
|
if (ret > 0 && usage != NULL)
|
||
|
|
rusage32_to_rusage64 (&usage32, usage);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
# endif
|
||
|
|
#elif defined (__ASSUME_WAITID_PID0_P_PGID)
|
||
|
|
idtype_t idtype = P_PID;
|
||
|
|
|
||
|
|
if (pid < -1)
|
||
|
|
{
|
||
|
|
idtype = P_PGID;
|
||
|
|
pid *= -1;
|
||
|
|
}
|
||
|
|
else if (pid == -1)
|
||
|
|
idtype = P_ALL;
|
||
|
|
else if (pid == 0)
|
||
|
|
idtype = P_PGID;
|
||
|
|
|
||
|
|
options |= WEXITED;
|
||
|
|
|
||
|
|
siginfo_t infop;
|
||
|
|
|
||
|
|
# if __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
|
||
|
|
if (SYSCALL_CANCEL (waitid, idtype, pid, &infop, options, usage) < 0)
|
||
|
|
return -1;
|
||
|
|
# else
|
||
|
|
{
|
||
|
|
struct __rusage32 usage32;
|
||
|
|
if (SYSCALL_CANCEL (waitid, idtype, pid, &infop, options, &usage32) < 0)
|
||
|
|
return -1;
|
||
|
|
if (usage != NULL)
|
||
|
|
rusage32_to_rusage64 (&usage32, usage);
|
||
|
|
}
|
||
|
|
# endif
|
||
|
|
|
||
|
|
if (stat_loc)
|
||
|
|
{
|
||
|
|
switch (infop.si_code)
|
||
|
|
{
|
||
|
|
case CLD_EXITED:
|
||
|
|
*stat_loc = W_EXITCODE (infop.si_status, 0);
|
||
|
|
break;
|
||
|
|
case CLD_DUMPED:
|
||
|
|
*stat_loc = WCOREFLAG | infop.si_status;
|
||
|
|
break;
|
||
|
|
case CLD_KILLED:
|
||
|
|
*stat_loc = infop.si_status;
|
||
|
|
break;
|
||
|
|
case CLD_TRAPPED:
|
||
|
|
case CLD_STOPPED:
|
||
|
|
*stat_loc = W_STOPCODE (infop.si_status);
|
||
|
|
break;
|
||
|
|
case CLD_CONTINUED:
|
||
|
|
*stat_loc = __W_CONTINUED;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
*stat_loc = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return infop.si_pid;
|
||
|
|
#else
|
||
|
|
/* Linux waitid prior kernel 5.4 does not support waiting for the current
|
||
|
|
process. It is possible to emulate wait4 it by calling getpgid for
|
||
|
|
PID 0, however, it would require an additional syscall and it is inherent
|
||
|
|
racy: after the current process group is received and before it is passed
|
||
|
|
to waitid a signal could arrive causing the current process group to
|
||
|
|
change. */
|
||
|
|
# error "The kernel ABI does not provide a way to implement wait4"
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#if __TIMESIZE != 64
|
||
|
|
libc_hidden_def (__wait4_time64)
|
||
|
|
|
||
|
|
pid_t
|
||
|
|
__wait4 (pid_t pid, int *stat_loc, int options, struct rusage *usage)
|
||
|
|
{
|
||
|
|
pid_t ret;
|
||
|
|
struct __rusage64 usage64;
|
||
|
|
|
||
|
|
ret = __wait4_time64 (pid, stat_loc, options,
|
||
|
|
usage != NULL ? &usage64 : NULL);
|
||
|
|
|
||
|
|
if (ret > 0 && usage != 0)
|
||
|
|
rusage64_to_rusage (&usage64, usage);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
libc_hidden_def (__wait4);
|
||
|
|
weak_alias (__wait4, wait4)
|