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authorPerberos <[email protected]>2011-11-04 22:16:15 -0300
committerPerberos <[email protected]>2011-11-04 22:16:15 -0300
commitfff4ecc82f2bcfa7427596e7ad9c3769fcab040b (patch)
treeac4f1812a7991609c9c32c776daede2d8492f7b5 /src/subprocs.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * subprocs.c --- choosing, spawning, and killing screenhacks.
+ *
+ * xscreensaver, Copyright (c) 1991-2003 Jamie Zawinski <[email protected]>
+ * Modified: Copyright (c) 2004 William Jon McCann <[email protected]>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation. No representations are made about the suitability of this
+ * software for any purpose. It is provided "as is" without express or
+ * implied warranty.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifndef ESRCH
+# include <errno.h>
+#endif
+
+#include <sys/time.h> /* sys/resource.h needs this for timeval */
+# include <sys/wait.h> /* for waitpid() and associated macros */
+
+#ifdef VMS
+# include <processes.h>
+# include <unixio.h> /* for close */
+# include <unixlib.h> /* for getpid */
+# define pid_t int
+# define fork vfork
+#endif /* VMS */
+
+#include <signal.h> /* for the signal names */
+
+#include <glib.h>
+#include "subprocs.h"
+
+#if !defined(SIGCHLD) && defined(SIGCLD)
+# define SIGCHLD SIGCLD
+#endif
+
+/* Semaphore to temporarily turn the SIGCHLD handler into a no-op.
+ Don't alter this directly -- use block_sigchld() / unblock_sigchld().
+*/
+static int block_sigchld_handler = 0;
+
+
+#ifdef HAVE_SIGACTION
+sigset_t
+#else /* !HAVE_SIGACTION */
+int
+#endif /* !HAVE_SIGACTION */
+block_sigchld (void)
+{
+#ifdef HAVE_SIGACTION
+ sigset_t child_set;
+ sigemptyset (&child_set);
+ sigaddset (&child_set, SIGCHLD);
+ sigaddset (&child_set, SIGPIPE);
+ sigprocmask (SIG_BLOCK, &child_set, 0);
+#endif /* HAVE_SIGACTION */
+
+ block_sigchld_handler++;
+
+#ifdef HAVE_SIGACTION
+ return child_set;
+#else /* !HAVE_SIGACTION */
+ return 0;
+#endif /* !HAVE_SIGACTION */
+}
+
+void
+unblock_sigchld (void)
+{
+#ifdef HAVE_SIGACTION
+ sigset_t child_set;
+ sigemptyset (&child_set);
+ sigaddset (&child_set, SIGCHLD);
+ sigaddset (&child_set, SIGPIPE);
+ sigprocmask (SIG_UNBLOCK, &child_set, 0);
+#endif /* HAVE_SIGACTION */
+
+ block_sigchld_handler--;
+}
+
+int
+signal_pid (int pid,
+ int signal)
+{
+ int status = -1;
+ gboolean verbose = TRUE;
+
+ if (block_sigchld_handler)
+ /* This function should not be called from the signal handler. */
+ abort();
+
+ block_sigchld (); /* we control the horizontal... */
+
+ status = kill (pid, signal);
+
+ if (verbose && status < 0)
+ {
+ if (errno == ESRCH)
+ g_message ("Child process %lu was already dead.",
+ (unsigned long) pid);
+ else
+ {
+ char buf [1024];
+ snprintf (buf, sizeof (buf), "Couldn't kill child process %lu",
+ (unsigned long) pid);
+ perror (buf);
+ }
+ }
+
+ unblock_sigchld ();
+
+ if (block_sigchld_handler < 0)
+ abort ();
+
+ return status;
+}
+
+#ifndef VMS
+
+void
+await_dying_children (int pid,
+ gboolean debug)
+{
+ while (1)
+ {
+ int wait_status = 0;
+ pid_t kid;
+
+ errno = 0;
+ kid = waitpid (-1, &wait_status, WNOHANG|WUNTRACED);
+
+ if (debug)
+ {
+ if (kid < 0 && errno)
+ g_message ("waitpid(%d) ==> %ld (%d)", pid, (long) kid, errno);
+ else if (kid != 0)
+ g_message ("waitpid(%d) ==> %ld", pid, (long) kid);
+ }
+
+ /* 0 means no more children to reap.
+ -1 means error -- except "interrupted system call" isn't a "real"
+ error, so if we get that, we should just try again. */
+ if (kid < 0 && errno != EINTR)
+ break;
+ }
+}
+
+
+#else /* VMS */
+static void await_dying_children (saver_info *si)
+{
+ return;
+}
+#endif /* VMS */
+