Updated utils.

[utils.git] / serialize.c

diff --git a/serialize.c b/serialize.c
new file mode 100644 (file)
index 0000000..4a851b1
--- /dev/null
+++ b/serialize.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/file.h>
+
+int main(int argc, unsigned char **argv)
+{
+    int c;
+    int fd, locktype;
+    pid_t pid;
+    int status;
+    
+    locktype = LOCK_EX;
+    while((c = getopt(argc, argv, "se")) > 0)
+    {
+       switch(c)
+       {
+       case 's':
+           locktype = LOCK_SH;
+           break;
+       case 'e':
+           locktype = LOCK_EX;
+           break;
+       default:
+           return(1);
+       }
+    }
+    if(argc - optind < 2)
+    {
+       fprintf(stderr, "Wrong number of arguments\n");
+       return(1);
+    }
+    if((fd = open(argv[optind], O_RDWR | O_CREAT, 0600)) < 0)
+    {
+       perror(argv[optind]);
+       return(1);
+    }
+    optind++;
+    flock(fd, locktype);
+    if((pid = fork()) < 0)
+    {
+       perror("fork");
+       return(1);
+    } else if(!pid) {
+       execvp(argv[optind], argv + optind);
+       perror(argv[optind]);
+       exit(127);
+    }
+    while(wait(&status) != pid);
+    flock(fd, LOCK_UN);
+    return(status);
+}