[PATCH 5/6] opensm: Add command-line option --pidfile

[Bart Van Assche]

This option is necessary to control opensm from an LSB-compliant
init script.

Signed-off-by: Bart Van Assche <bvanass...@acm.org>
---
 opensm/main.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/opensm/main.c b/opensm/main.c
index e9a0b4c..1a061a8 100644
--- a/opensm/main.c
+++ b/opensm/main.c
@@ -68,6 +68,7 @@ volatile unsigned int osm_exit_flag = 0;
 
 static volatile unsigned int osm_hup_flag = 0;
 static volatile unsigned int osm_usr1_flag = 0;
+static char *pidfile;
 
 #define MAX_LOCAL_IBPORTS 64
 #define INVALID_GUID (0xFFFFFFFFFFFFFFFFULL)
@@ -498,10 +499,17 @@ static ib_net64_t get_port_guid(IN osm_opensm_t * p_osm, 
uint64_t port_guid)
        return attr_array[choice].port_guid;
 }
 
+static void remove_pidfile(void)
+{
+       if (pidfile)
+               unlink(pidfile);
+}
+
 static int daemonize(osm_opensm_t * osm)
 {
        pid_t pid;
        int fd;
+       FILE *f;
 
        fd = open("/dev/null", O_WRONLY);
        if (fd < 0) {
@@ -523,6 +531,18 @@ static int daemonize(osm_opensm_t * osm)
        } else if (pid > 0)
                exit(0);
 
+       if (pidfile) {
+               remove_pidfile();
+               f = fopen(pidfile, "w");
+               if (f) {
+                       fprintf(f, "%d\n", getpid());
+                       fclose(f);
+               } else {
+                       perror("fopen");
+                       exit(1);
+               }
+       }
+
        close(0);
        close(1);
        close(2);
@@ -649,6 +669,7 @@ int main(int argc, char *argv[])
                {"console-port", 1, NULL, 'C'},
 #endif
                {"daemon", 0, NULL, 'B'},
+               {"pidfile", 1, NULL, 'J'},
                {"inactive", 0, NULL, 'I'},
 #ifdef ENABLE_OSM_PERF_MGR
                {"perfmgr", 0, NULL, 1},
@@ -887,6 +908,10 @@ int main(int argc, char *argv[])
                        printf(" Creating new log file\n");
                        break;
 
+               case 'J':
+                       pidfile = optarg;
+                       break;
+
                case 'P':
                        SET_STR_OPT(opt.partition_config_file, optarg);
                        break;
@@ -1212,6 +1237,7 @@ int main(int argc, char *argv[])
 Exit:
        osm_opensm_destroy(&osm);
        complib_exit();
+       remove_pidfile();
 
        exit(0);
 }
-- 
1.7.7

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