import winsup-2000-02-17 snapshot

1 files changed, 113 insertions, 0 deletions

diff --git a/winsup/cygwin/wait.cc b/winsup/cygwin/wait.cc
new file mode 100644
index 000000000..182240022
--- /dev/null
+++ b/winsup/cygwin/wait.cc
@@ -0,0 +1,113 @@
+/* wait.cc: Posix wait routines.
+
+   Copyright 1996, 1997, 1998, 1999 Cygnus Solutions.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "winsup.h"
+
+/* This is called _wait and not wait because the real wait is defined
+   in libc/syscalls/syswait.c.  It calls us.  */
+
+extern "C"
+pid_t
+_wait (int *status)
+{
+  return wait4 (-1, status, 0, NULL);
+}
+
+pid_t
+waitpid (pid_t intpid, int *status, int options)
+{
+  return wait4 (intpid, status, options, NULL);
+}
+
+pid_t
+wait3 (int *status, int options, struct rusage *r)
+{
+  return wait4 (-1, status, options, r);
+}
+
+/* Wait for any child to complete.
+ * Note: this is not thread safe.  Use of wait in multiple threads will
+ * not work correctly.
+ */
+
+pid_t
+wait4 (int intpid, int *status, int options, struct rusage *r)
+{
+  int rc;
+  waitq *w;
+  HANDLE waitfor;
+
+ if (options & ~(WNOHANG | WUNTRACED))
+    {
+      set_errno (EINVAL);
+      return -1;
+    }
+
+  if (r)
+    memset (r, 0, sizeof (*r));
+
+  if ((w = (waitq *) waitq_storage.get ()) == NULL)
+    w = (waitq *) waitq_storage.create ();
+
+  w->pid = intpid;
+  w->options = options;
+  w->rusage = r;
+  sigproc_printf("calling proc_subproc, pid %d, options %d",
+		 w->pid, w->options);
+  if (!proc_subproc(PROC_WAIT, (DWORD)w))
+    {
+      set_errno(ENOSYS);
+      paranoid_printf ("proc_subproc returned 0");
+      rc = -1;
+      goto done;
+    }
+
+  if ((waitfor = w->ev) == NULL)
+    goto nochildren;
+
+  rc = WaitForSingleObject (waitfor, INFINITE);
+
+  sigproc_printf ("%d = WaitForSingleObject (...)", rc);
+
+  if (w->ev == NULL)
+    {
+    nochildren:
+      /* found no children */
+      set_errno (ECHILD);
+      rc = -1;
+      goto done;
+    }
+
+  if (w->status == -1)
+    {
+      set_sig_errno (EINTR);
+      rc = -1;
+    }
+  else if (rc != WAIT_OBJECT_0)
+    {
+      /* We shouldn't set errno to any random value if we can help it.
+	 See the Posix manual for a list of valid values for `errno'.  */
+      set_errno (EINVAL);
+      rc = -1;
+    }
+  else if ((rc = w->pid) != 0 && status)
+    *status = w->status;
+
+done:
+  sigproc_printf ("intpid %d, status %p, w->status %d, options %d, rc %d",
+		  intpid, status, w->status, options, rc);
+  w->status = -1;
+  if (rc < 0)
+    sigproc_printf("*** errno = %d", get_errno());
+  return rc;
+}