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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* Wait for process to change state. Linux version.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/wait.h>
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#include <sys/resource.h>
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#include <sysdep-cancel.h>
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pid_t
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__wait4 (pid_t pid, int *stat_loc, int options, struct rusage *usage)
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{
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#ifdef __NR_wait4
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return SYSCALL_CANCEL (wait4, pid, stat_loc, options, usage);
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#elif defined (__ASSUME_WAITID_PID0_P_PGID)
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idtype_t idtype = P_PID;
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if (pid < -1)
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{
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idtype = P_PGID;
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pid *= -1;
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}
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else if (pid == -1)
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idtype = P_ALL;
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else if (pid == 0)
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idtype = P_PGID;
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options |= WEXITED;
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siginfo_t infop;
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if (SYSCALL_CANCEL (waitid, idtype, pid, &infop, options, usage) < 0)
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return -1;
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if (stat_loc)
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{
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switch (infop.si_code)
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{
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case CLD_EXITED:
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*stat_loc = W_EXITCODE (infop.si_status, 0);
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break;
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case CLD_DUMPED:
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*stat_loc = WCOREFLAG | infop.si_status;
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break;
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case CLD_KILLED:
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*stat_loc = infop.si_status;
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break;
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case CLD_TRAPPED:
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case CLD_STOPPED:
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*stat_loc = W_STOPCODE (infop.si_status);
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break;
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case CLD_CONTINUED:
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*stat_loc = __W_CONTINUED;
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break;
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default:
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*stat_loc = 0;
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break;
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}
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}
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return infop.si_pid;
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# else
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/* Linux waitid prior kernel 5.4 does not support waiting for the current
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process. It is possible to emulate wait4 it by calling getpgid for
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PID 0, however, it would require an additional syscall and it is inherent
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racy: after the current process group is received and before it is passed
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to waitid a signal could arrive causing the current process group to
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change. */
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# error "The kernel ABI does not provide a way to implement wait4"
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#endif
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}
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libc_hidden_def (__wait4);
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weak_alias (__wait4, wait4)
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