Use argv0 instead of passing "slock:" to die every time

diff --git a/slock.c b/slock.c
index 4531f95a5cd67cc3e767794e6144fdcb08663c92..a0ffed07e0cd321c2a5fcceda98fe9d10ca6f3d0 100644 (file)
--- a/slock.c
+++ b/slock.c
@@ -46,6 +46,7 @@ static Bool failure = False;
 static Bool rr;
 static int rrevbase;
 static int rrerrbase;
+static char *argv0;
 
 static void
 die(const char *errstr, ...)
@@ -53,6 +54,7 @@ die(const char *errstr, ...)
        va_list ap;
 
        va_start(ap, errstr);
+       fprintf(stderr, "%s: ", argv0);
        vfprintf(stderr, errstr, ap);
        va_end(ap);
        exit(1);
@@ -88,9 +90,9 @@ getpw(void)
        errno = 0;
        if (!(pw = getpwuid(getuid()))) {
                if (errno)
-                       die("slock: getpwuid: %s\n", strerror(errno));
+                       die("getpwuid: %s\n", strerror(errno));
                else
-                       die("slock: cannot retrieve password entry\n");
+                       die("cannot retrieve password entry\n");
        }
        rval = pw->pw_passwd;
 
@@ -98,7 +100,7 @@ getpw(void)
        if (rval[0] == 'x' && rval[1] == '\0') {
                struct spwd *sp;
                if (!(sp = getspnam(getenv("USER"))))
-                       die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
+                       die("cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
                rval = sp->sp_pwdp;
        }
 #endif
@@ -106,7 +108,7 @@ getpw(void)
        /* drop privileges */
        if (geteuid() == 0 &&
            ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
-               die("slock: cannot drop privileges\n");
+               die("cannot drop privileges\n");
        return rval;
 }
 #endif
@@ -254,7 +256,7 @@ lockscreen(Display *dpy, int screen)
                usleep(1000);
        }
        if (!len) {
-               fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
+               fprintf(stderr, "unable to grab mouse pointer for screen %d\n", screen);
        } else {
                for (len = 1000; len; len--) {
                        if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) {
@@ -264,7 +266,7 @@ lockscreen(Display *dpy, int screen)
                        }
                        usleep(1000);
                }
-               fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
+               fprintf(stderr, "unable to grab keyboard for screen %d\n", screen);
        }
        /* grabbing one of the inputs failed */
        running = 0;
@@ -281,24 +283,26 @@ main(int argc, char **argv)
        Display *dpy;
        int screen;
 
+       argv0 = argv[0], argc--, argv++;
+
 #ifdef __linux__
        dontkillme();
 #endif
 
        if (!getpwuid(getuid()))
-               die("slock: no passwd entry for you\n");
+               die("no passwd entry for you\n");
 
 #ifndef HAVE_BSD_AUTH
        pws = getpw();
 #endif
 
        if (!(dpy = XOpenDisplay(0)))
-               die("slock: cannot open display\n");
+               die("cannot open display\n");
        rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
        /* Get the number of screens in display "dpy" and blank them all. */
        nscreens = ScreenCount(dpy);
        if (!(locks = malloc(sizeof(Lock*) * nscreens)))
-               die("slock: malloc: %s\n", strerror(errno));
+               die("Out of memory.\n");
        int nlocks = 0;
        for (screen = 0; screen < nscreens; screen++) {
                if ((locks[screen] = lockscreen(dpy, screen)) != NULL)
@@ -313,11 +317,11 @@ main(int argc, char **argv)
                return 1;
        }
 
-       if (argc >= 2 && fork() == 0) {
+       if (argc >= 1 && fork() == 0) {
                if (dpy)
                        close(ConnectionNumber(dpy));
-               execvp(argv[1], argv+1);
-               die("slock: execvp %s failed: %s\n", argv[1], strerror(errno));
+               execvp(argv[0], argv);
+               die("execvp %s failed: %s\n", argv[0], strerror(errno));
        }
 
        /* Everything is now blank. Now wait for the correct password. */