143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Pseudo implementation of waitid.
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Copyright (C) 1997, 1998, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1997.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#define __need_NULL
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#include <stddef.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sysdep-cancel.h>
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static int
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do_waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
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{
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pid_t pid, child;
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int status;
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switch (idtype)
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{
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case P_PID:
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if(id <= 0)
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goto invalid;
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pid = (pid_t) id;
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break;
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case P_PGID:
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if (id < 0 || id == 1)
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goto invalid;
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pid = (pid_t) -id;
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break;
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case P_ALL:
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pid = -1;
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break;
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default:
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invalid:
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__set_errno (EINVAL);
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return -1;
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}
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/* Technically we're supposed to return EFAULT if infop is bogus,
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but that would involve mucking with signals, which is
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too much hassle. User will have to deal with SIGSEGV/SIGBUS.
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We just check for a null pointer. */
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if (infop == NULL)
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{
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__set_errno (EFAULT);
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return -1;
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}
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/* Note the waitid() is a cancellation point. But since we call
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waitpid() which itself is a cancellation point we do not have
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to do anything here. */
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child = __waitpid (pid, &status, options);
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if (child == -1)
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/* `waitpid' set `errno' for us. */
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return -1;
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if (child == 0)
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{
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/* The WHOHANG bit in OPTIONS is set and there are children available
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but none has a status for us. The XPG docs do not mention this
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case so we clear the `siginfo_t' struct and return successfully. */
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infop->si_signo = 0;
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infop->si_code = 0;
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return 0;
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}
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/* Decode the status field and set infop members... */
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infop->si_signo = SIGCHLD;
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infop->si_pid = child;
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infop->si_errno = 0;
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if (WIFEXITED (status))
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{
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infop->si_code = CLD_EXITED;
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infop->si_status = WEXITSTATUS (status);
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}
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else if (WIFSIGNALED (status))
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{
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infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED;
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infop->si_status = WTERMSIG (status);
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}
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else if (WIFSTOPPED (status))
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{
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infop->si_code = CLD_STOPPED;
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infop->si_status = WSTOPSIG (status);
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}
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#ifdef WIFCONTINUED
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else if (WIFCONTINUED (status))
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{
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infop->si_code = CLD_CONTINUED;
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infop->si_status = SIGCONT;
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}
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#endif
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else
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/* Can't happen. */
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assert (! "What?");
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return 0;
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}
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int
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__waitid (idtype, id, infop, options)
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idtype_t idtype;
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id_t id;
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siginfo_t *infop;
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int options;
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{
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if (SINGLE_THREAD_P)
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return do_waitid (idtype, id, infop, options);
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int oldtype = LIBC_CANCEL_ASYNC ();
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int result = do_waitid (idtype, id, infop, options);
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LIBC_CANCEL_RESET (oldtype);
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return result;
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}
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weak_alias (__waitid, waitid)
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strong_alias (__waitid, __libc_waitid)
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