130 lines
2.7 KiB
C++
130 lines
2.7 KiB
C++
/* wait.cc: Posix wait routines.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "cygerrno.h"
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#include "sigproc.h"
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#include "perthread.h"
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#include "thread.h"
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/* This is called _wait and not wait because the real wait is defined
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in libc/syscalls/syswait.c. It calls us. */
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extern "C" pid_t
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wait (int *status)
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{
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return wait4 (-1, status, 0, NULL);
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}
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extern "C" pid_t
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waitpid (pid_t intpid, int *status, int options)
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{
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return wait4 (intpid, status, options, NULL);
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}
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extern "C" pid_t
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wait3 (int *status, int options, struct rusage *r)
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{
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return wait4 (-1, status, options, r);
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}
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/* Wait for any child to complete.
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* Note: this is not thread safe. Use of wait in multiple threads will
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* not work correctly.
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*/
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extern "C" pid_t
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wait4 (int intpid, int *status, int options, struct rusage *r)
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{
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int res;
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waitq *w;
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HANDLE waitfor;
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bool sawsig;
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pthread_testcancel ();
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while (1)
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{
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sig_dispatch_pending (0);
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sigframe thisframe (mainthread);
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sawsig = 0;
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if (options & ~(WNOHANG | WUNTRACED))
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{
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set_errno (EINVAL);
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return -1;
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}
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if (r)
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memset (r, 0, sizeof (*r));
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if ((w = (waitq *) waitq_storage.get ()) == NULL)
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w = (waitq *) waitq_storage.create ();
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w->pid = intpid;
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w->options = options;
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w->rusage = r;
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sigproc_printf ("calling proc_subproc, pid %d, options %d",
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w->pid, w->options);
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if (!proc_subproc (PROC_WAIT, (DWORD)w))
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{
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set_errno (ENOSYS);
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paranoid_printf ("proc_subproc returned 0");
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res = -1;
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goto done;
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}
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if ((waitfor = w->ev) == NULL)
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goto nochildren;
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res = pthread::cancelable_wait (waitfor, INFINITE);
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sigproc_printf ("%d = WaitForSingleObject (...)", res);
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if (w->ev == NULL)
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{
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nochildren:
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/* found no children */
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set_errno (ECHILD);
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res = -1;
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goto done;
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}
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if (w->status == -1)
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{
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set_sig_errno (EINTR);
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sawsig = 1;
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res = -1;
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}
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else if (res != WAIT_OBJECT_0)
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{
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/* We shouldn't set errno to any random value if we can help it.
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See the Posix manual for a list of valid values for `errno'. */
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set_errno (EINVAL);
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res = -1;
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}
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else if ((res = w->pid) != 0 && status)
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*status = w->status;
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done:
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if (!sawsig || !thisframe.call_signal_handler ())
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break;
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}
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sigproc_printf ("intpid %d, status %p, w->status %d, options %d, res %d",
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intpid, status, w->status, options, res);
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w->status = -1;
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if (res < 0)
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sigproc_printf ("*** errno = %d", get_errno ());
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return res;
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}
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