1 files changed, 124 insertions, 0 deletions
diff --git a/src/tools/common/sss_process.c b/src/tools/common/sss_process.c
new file mode 100644
index 0000000..fc710a5
--- /dev/null
+++ b/src/tools/common/sss_process.c
@@ -0,0 +1,124 @@
+/*
+    Authors:
+        Pavel Březina <pbrezina@redhat.com>
+
+    Copyright (C) 2016 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include "util/util.h"
+#include "tools/common/sss_process.h"
+
+static pid_t parse_pid(const char *strpid)
+{
+    long value;
+    char *endptr;
+
+    errno = 0;
+    value = strtol(strpid, &endptr, 10);
+    if ((errno != 0) || (endptr == strpid)
+        || ((*endptr != '\0') && (*endptr != '\n'))) {
+        return 0;
+    }
+
+    return value;
+}
+
+static errno_t sss_pid(pid_t *out_pid)
+{
+    int ret;
+    size_t fsize;
+    FILE *pid_file;
+    char pid_str[MAX_PID_LENGTH] = {'\0'};
+
+    *out_pid = 0;
+
+    errno = 0;
+    pid_file = fopen(SSSD_PIDFILE, "r");
+    if (pid_file == NULL) {
+        ret = errno;
+        DEBUG(SSSDBG_MINOR_FAILURE, "Unable to open pid file \"%s\": %s\n",
+              SSSD_PIDFILE, strerror(ret));
+        goto done;
+    }
+
+    fsize = fread(pid_str, sizeof(char), MAX_PID_LENGTH * sizeof(char),
+                  pid_file);
+    if (!feof(pid_file)) {
+        /* eof not reached */
+        ret = ferror(pid_file);
+        if (ret != 0) {
+            DEBUG(SSSDBG_CRIT_FAILURE, "Unable to read from file \"%s\": %s\n",
+                  SSSD_PIDFILE, strerror(ret));
+        } else {
+            DEBUG(SSSDBG_CRIT_FAILURE, "File \"%s\" contains invalid pid.\n",
+                  SSSD_PIDFILE);
+        }
+        goto done;
+    }
+    if (fsize == 0) {
+        DEBUG(SSSDBG_CRIT_FAILURE, "File \"%s\" contains no pid.\n",
+              SSSD_PIDFILE);
+        ret = EINVAL;
+        goto done;
+    }
+
+    pid_str[MAX_PID_LENGTH-1] = '\0';
+    *out_pid = parse_pid(pid_str);
+    if (*out_pid == 0) {
+        DEBUG(SSSDBG_CRIT_FAILURE,
+              "File \"%s\" contains invalid pid.\n", SSSD_PIDFILE);
+        ret = EINVAL;
+        goto done;
+    }
+
+    ret = EOK;
+
+done:
+    if (pid_file != NULL) {
+        fclose(pid_file);
+    }
+    return ret;
+}
+
+bool sss_daemon_running(void)
+{
+    return sss_signal(0) == EOK;
+}
+
+errno_t sss_signal(int signum)
+{
+    int ret;
+    pid_t pid;
+
+    ret = sss_pid(&pid);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    if (kill(pid, signum) != 0) {
+        ret = errno;
+        DEBUG(SSSDBG_CRIT_FAILURE,
+              "Could not send signal %d to process %d: %s\n",
+              signum, pid, strerror(errno));
+        return ret;
+    }
+
+    return EOK;
+}