From 3c77c6e7d3f597400b3ae10dd1228aabf1ad6280 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sat, 20 Nov 2004 23:48:18 +0000
Subject: * remove autospawn lock file usage * fix some compiler warnings *
 implement PID file support

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@296 fefdeb5f-60dc-0310-8127-8f9354f1896f
---
 polyp/pid.c | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100644 polyp/pid.c

(limited to 'polyp/pid.c')

diff --git a/polyp/pid.c b/polyp/pid.c
new file mode 100644
index 00000000..142c4f6d
--- /dev/null
+++ b/polyp/pid.c
@@ -0,0 +1,197 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or (at your option) any later version.
+ 
+  polypaudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public
+  License along with polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <signal.h>
+
+#include "pid.h"
+#include "util.h"
+#include "log.h"
+
+static pid_t read_pid(const char *fn, int fd) {
+    ssize_t r;
+    char t[20], *e = NULL;
+    long int pid;
+
+    assert(fn && fd >= 0);
+
+    if ((r = pa_loop_read(fd, t, sizeof(t)-1)) < 0) {
+        pa_log(__FILE__": WARNING: failed to read PID file '%s': %s\n", fn, strerror(errno));
+        return (pid_t) -1;
+    }
+
+    if (r == 0)
+        return (pid_t) 0;
+    
+    t[r] = 0;
+
+    if (!t[0] || (pid = strtol(t, &e, 0)) == 0 || (*e != 0 && *e != '\n')) {
+        pa_log(__FILE__": WARNING: failed to parse PID file '%s'\n", fn);
+        return (pid_t) -1;
+    }
+
+    return (pid_t) pid;
+}
+
+int pa_pid_file_create(void) {
+    int fd = -1, lock = -1;
+    int ret = -1;
+    char fn[PATH_MAX];
+    char t[20];
+    pid_t pid;
+    size_t l;
+
+    pa_runtime_path("pid", fn, sizeof(fn));
+    if ((fd = open(fn, O_CREAT|O_RDWR, S_IRUSR|S_IWUSR)) < 0) {
+        pa_log(__FILE__": WARNING: failed to open PID file '%s': %s\n", fn, strerror(errno));
+        goto fail;
+    }
+
+    lock = pa_lock_fd(fd, 1);
+
+    if ((pid = read_pid(fn, fd)) == (pid_t) -1)
+        pa_log(__FILE__": corrupt PID file, overwriting.\n");
+    else if (pid > 0) {
+        if (kill(pid, 0) >= 0 || errno != ESRCH) {
+            pa_log(__FILE__": valid PID file.\n");
+            goto fail;
+        }
+
+        pa_log(__FILE__": stale PID file, overwriting.\n");
+    }
+
+    lseek(fd, 0, SEEK_SET);
+    
+    snprintf(t, sizeof(t), "%lu", (unsigned long) getpid());
+    l = strlen(t);
+    
+    if (pa_loop_write(fd, t, l) != (ssize_t) l) {
+        pa_log(__FILE__": failed to write PID file.\n");
+        goto fail;
+    }
+
+    ret = 0;
+    
+fail:
+    if (fd >= 0) {
+        if (lock >= 0)
+            pa_lock_fd(fd, 0);
+
+        close(fd);
+    }
+    
+    return ret;
+}
+
+int pa_pid_file_remove(void) {
+    int fd = -1, lock = -1;
+    char fn[PATH_MAX];
+    int ret = -1;
+    pid_t pid;
+
+    pa_runtime_path("pid", fn, sizeof(fn));
+    if ((fd = open(fn, O_RDWR)) < 0) {
+        pa_log(__FILE__": WARNING: failed to open PID file '%s': %s\n", fn, strerror(errno));
+        goto fail;
+    }
+
+    lock = pa_lock_fd(fd, 1);
+
+    if ((pid = read_pid(fn, fd)) == (pid_t) -1)
+        goto fail;
+
+    if (pid != getpid()) {
+        pa_log(__FILE__": WARNING: PID file '%s' not mine!\n", fn);
+        goto fail;
+    }
+
+    if (ftruncate(fd, 0) < 0) {
+        pa_log(__FILE__": failed to truncate PID file '%s': %s\n", fn, strerror(errno));
+        goto fail;
+    }
+
+    if (unlink(fn) < 0) {
+        pa_log(__FILE__": failed to remove PID file '%s': %s\n", fn, strerror(errno));
+        goto fail;
+    }
+
+    ret = 0;
+    
+fail:
+
+    if (fd >= 0) {
+        if (lock >= 0)
+            pa_lock_fd(fd, 0);
+
+        close(fd);
+    }
+
+    return ret;
+}
+
+int pa_pid_file_check_running(pid_t *pid) {
+    return pa_pid_file_kill(0, pid);
+}
+
+int pa_pid_file_kill(int sig, pid_t *pid) {
+    int fd = -1, lock = -1;
+    char fn[PATH_MAX];
+    int ret = -1;
+    pid_t _pid;
+
+    if (!pid)
+        pid = &_pid;
+
+    pa_runtime_path("pid", fn, sizeof(fn));
+    if ((fd = open(fn, O_RDONLY)) < 0)
+        goto fail;
+
+    lock = pa_lock_fd(fd, 1);
+
+    if ((*pid = read_pid(fn, fd)) == (pid_t) -1)
+        goto fail;
+
+    ret = kill(*pid, sig);
+    
+fail:
+
+    if (fd >= 0) {
+        if (lock >= 0)
+            pa_lock_fd(fd, 0);
+
+        close(fd);
+    }
+
+    return ret;
+    
+}
-- 
cgit