Messi gli esempi nel testo e usata daemon dove serve nei server

[gapil.git] / sources / DirMonitor.c

diff --git a/sources/DirMonitor.c b/sources/DirMonitor.c
index 7e6b2884ee7866b3e666c702420266e4f1337c16..c9b92f43ab2bf8245a8ff5a2a1d6c7bdd311a4d0 100644 (file)
--- a/sources/DirMonitor.c
+++ b/sources/DirMonitor.c
@@ -25,7 +25,7 @@
  *
  * Author: S. Piccardi Jan. 2003
  *
- * $Id: DirMonitor.c,v 1.2 2003/01/04 17:24:30 piccardi Exp $
+ * $Id: DirMonitor.c,v 1.5 2003/01/12 00:24:28 piccardi Exp $
  *
  *****************************************************************************/
 #include <sys/types.h>
@@ -54,8 +54,7 @@ struct DirProp {
     int tot_block;   
     int tot_char;    
     int tot_sock;
-};
-struct DirProp *shmptr;
+} *shmptr;
 int shmid; 
 int mutex;
 
@@ -99,11 +98,14 @@ int main(int argc, char *argv[])
        printf("Wrong number of arguments %d\n", argc - optind);
         usage();
     }
+    if (chdir(argv[1])) {                      /* chdir to be sure dir exist */
+       perror("Cannot find directory to monitor");
+       exit(1);
+    }
     Signal(SIGTERM, HandSIGTERM);            /* set handlers for termination */
     Signal(SIGINT, HandSIGTERM);
     Signal(SIGQUIT, HandSIGTERM);
-    /* create needed IPC objects */
-    key = ftok("./DirMonitor.c", 1);                         /* define a key */
+    key = ftok("~/gapil/sources/DirMonitor.c", 1);  /* define a key, use dir */
     shmid = shmget(key, 4096, IPC_CREAT|0666);        /* get a shared memory */
     if (shmid < 0) {
        perror("Cannot create shared memory");
@@ -111,12 +113,14 @@ int main(int argc, char *argv[])
     }
     if ( (shmptr = shmat(shmid, NULL, 0)) == NULL ) {   /* attach to process */
        perror("Cannot attach segment");
+       exit(1);
     }
     if ((mutex = MutexCreate(key)) == -1) {                   /* get a Mutex */
        perror("Cannot create mutex");
        exit(1);
     }
     /* main loop, monitor directory properties each 10 sec */
+    daemon(1, 0);              /* demonize process, staying in monitored dir */
     while (1) {
        MutexLock(mutex);                              /* lock shared memory */
        memset(shmptr, 0, sizeof(struct DirProp));    /* erase previous data */
@@ -126,7 +130,7 @@ int main(int argc, char *argv[])
     }
 }
 /*
- * Routine to print file name and size inside DirScan
+ * Routine to compute directory properties inside DirScan
  */
 int ComputeValues(struct dirent * direntry) 
 {
@@ -137,10 +141,10 @@ int ComputeValues(struct dirent * direntry)
     if (S_ISREG(data.st_mode)) shmptr->tot_regular++;
     if (S_ISFIFO(data.st_mode)) shmptr->tot_fifo++;
     if (S_ISLNK(data.st_mode)) shmptr->tot_link++;
-    if (S_ISDIR(data.st_mode)) shmptr->tot_dir;
-    if (S_ISBLK(data.st_mode)) shmptr->tot_block;
-    if (S_ISCHR(data.st_mode)) shmptr->tot_char;
-    if (S_ISSOCK(data.st_mode)) shmptr->tot_sock;
+    if (S_ISDIR(data.st_mode)) shmptr->tot_dir++;
+    if (S_ISBLK(data.st_mode)) shmptr->tot_block++;
+    if (S_ISCHR(data.st_mode)) shmptr->tot_char++;
+    if (S_ISSOCK(data.st_mode)) shmptr->tot_sock++;
     return 0;
 }
 /*