PID should be stored in pid_t, not int or long.

find_pid_by_name() was returning 0 or -1 in last array element,
but -1 was never checked. We can use just 0 intead.

procps/kill.c

@@ -103,31 +103,31 @@ do_it_now:
 	}
 
 	/* Pid or name required for kill/killall */
-	if (argc<1)
+	if (argc < 1)
 		bb_show_usage();
 
 	if (killall) {
 		/* Looks like they want to do a killall.  Do that */
 		pid = getpid();
 		while (arg) {
-			long* pidList;
+			pid_t* pidList;
 
 			pidList = find_pid_by_name(arg);
-			if (!pidList || *pidList<=0) {
+			if (*pidList == 0) {
 				errors++;
 				if (!quiet)
 					bb_error_msg("%s: no process killed", arg);
 			} else {
-				long *pl;
+				pid_t *pl;
 
-				for (pl = pidList; *pl!=0; pl++) {
-					if (*pl==pid)
+				for (pl = pidList; *pl; pl++) {
+					if (*pl == pid)
 						continue;
-					if (kill(*pl, signo)!=0) {
-						errors++;
-						if (!quiet)
-							bb_perror_msg("cannot kill pid %ld", *pl);
-					}
+					if (kill(*pl, signo) == 0)
+						continue;
+					errors++;
+					if (!quiet)
+						bb_perror_msg("cannot kill pid %u", (unsigned)*pl);
 				}
 			}
 			free(pidList);
@@ -138,12 +138,14 @@ do_it_now:
 
 	/* Looks like they want to do a kill. Do that */
 	while (arg) {
-		if (!isdigit(arg[0]) && arg[0]!='-')
+		/* Huh?
+		if (!isdigit(arg[0]) && arg[0] != '-')
 			bb_error_msg_and_die("bad pid '%s'", arg);
+		*/
 		pid = xatou(arg);
 		/* FIXME: better overflow check? */
-		if (kill(pid, signo)!=0) {
-			bb_perror_msg("cannot kill pid %ld", (long)pid);
+		if (kill(pid, signo) != 0) {
+			bb_perror_msg("cannot kill pid %u", (unsigned)pid);
 			errors++;
 		}
 		arg = *++argv;

procps/pidof.c

@@ -18,18 +18,18 @@
 #endif
 
 #if ENABLE_FEATURE_PIDOF_OMIT
-#define _OMIT_COMPL(a) a
-#define _OMIT(a) ,a
-#if ENABLE_FEATURE_PIDOF_SINGLE
-#define OMIT (1<<1)
+# define _OMIT_COMPL(a) a
+# define _OMIT(a) ,a
+# if ENABLE_FEATURE_PIDOF_SINGLE
+#  define OMIT (1<<1)
+# else
+#  define OMIT (1<<0)
+# endif
 #else
-#define OMIT (1<<0)
-#endif
-#else
-#define _OMIT_COMPL(a) ""
-#define _OMIT(a)
-#define OMIT (0)
-#define omitted (0)
+# define _OMIT_COMPL(a) ""
+# define _OMIT(a)
+# define OMIT (0)
+# define omitted (0)
 #endif
 
 int pidof_main(int argc, char **argv)
@@ -65,21 +65,23 @@ int pidof_main(int argc, char **argv)
 #endif
 	/* Looks like everything is set to go.  */
 	while (optind < argc) {
-		long *pidList;
-		long *pl;
+		pid_t *pidList;
+		pid_t *pl;
 
 		/* reverse the pidlist like GNU pidof does.  */
 		pidList = pidlist_reverse(find_pid_by_name(argv[optind]));
-		for (pl = pidList; *pl > 0; pl++) {
+		for (pl = pidList; *pl; pl++) {
 #if ENABLE_FEATURE_PIDOF_OMIT
 			unsigned omitted = 0;
 			if (opt & OMIT) {
 				llist_t *omits_p = omits;
-				while (omits_p)
+				while (omits_p) {
 					if (xatoul(omits_p->data) == *pl) {
-						omitted = 1; break;
+						omitted = 1;
+						break;
 					} else
 						omits_p = omits_p->link;
+				}
 			}
 #endif
 			if (!omitted) {
@@ -88,7 +90,7 @@ int pidof_main(int argc, char **argv)
 				} else {
 					n = 1;
 				}
-				printf("%ld", *pl);
+				printf("%u", (unsigned)*pl);
 			}
 			fail = (!ENABLE_FEATURE_PIDOF_OMIT && omitted);
 

procps/ps.c

@@ -58,7 +58,7 @@ int ps_main(int argc, char **argv)
 			len = sizeof(sbuf);
 
 			if (is_selinux_enabled()) {
-				if (getpidcon(p->pid,&sid) < 0)
+				if (getpidcon(p->pid, &sid) < 0)
 					sid = NULL;
 			}
 
@@ -71,14 +71,14 @@ int ps_main(int argc, char **argv)
 			} else {
 				safe_strncpy(sbuf, "unknown", 7);
 			}
-			len = printf("%5d %-32s %s ", p->pid, sbuf, p->state);
+			len = printf("%5u %-32s %s ", (unsigned)p->pid, sbuf, p->state);
 		}
 		else
 #endif
 			if (p->rss == 0)
-				len = printf("%5d %-8s        %s ", p->pid, p->user, p->state);
+				len = printf("%5u %-8s        %s ", (unsigned)p->pid, p->user, p->state);
 			else
-				len = printf("%5d %-8s %6ld %s ", p->pid, p->user, p->rss, p->state);
+				len = printf("%5u %-8s %6ld %s ", (unsigned)p->pid, p->user, p->rss, p->state);
 
 		i = terminal_width-len;
 

procps/top.c

@@ -78,7 +78,7 @@ static int mult_lvl_cmp(void* a, void* b) {
    the next. Mostly used for sorting. */
 struct save_hist {
 	int ticks;
-	int pid;
+	pid_t pid;
 };
 
 /*
@@ -119,7 +119,8 @@ static void get_jiffy_counts(void)
 static void do_stats(void)
 {
 	procps_status_t *cur;
-	int pid, total_time, i, last_i, n;
+	pid_t pid;
+	int total_time, i, last_i, n;
 	struct save_hist *new_hist;
 
 	get_jiffy_counts();
@@ -328,9 +329,9 @@ static void display_status(int count, int scr_width)
 		else
 			sprintf(rss_str_buf, "%7ld", s->rss);
 		USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);)
-		col -= printf("\n%5d %-8s %s  %s%6d%3u.%c" \
+		col -= printf("\n%5u %-8s %s  %s%6u%3u.%c" \
 				USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c") " ",
-				s->pid, s->user, s->state, rss_str_buf, s->ppid,
+				(unsigned)s->pid, s->user, s->state, rss_str_buf, (unsigned)s->ppid,
 				USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
 				pmem.quot, '0'+pmem.rem);
 		if (col > 0)