Index: pkill.1
===================================================================
RCS file: /private/FreeBSD/src/usr.bin/pkill/pkill.1,v
retrieving revision 1.8
diff -u -p -r1.8 pkill.1
--- pkill.1	16 Aug 2004 04:49:43 -0000	1.8
+++ pkill.1	24 Oct 2004 23:21:46 -0000
@@ -45,6 +45,7 @@
 .Sh SYNOPSIS
 .Nm pgrep
 .Op Fl flnvx
+.Op Fl F Ar pidfile
 .Op Fl G Ar gid
 .Op Fl M Ar core
 .Op Fl N Ar system
@@ -59,6 +60,7 @@
 .Nm pkill
 .Op Fl Ar signal
 .Op Fl fnvx
+.Op Fl F Ar pidfile
 .Op Fl G Ar gid
 .Op Fl M Ar core
 .Op Fl N Ar system
@@ -82,7 +84,11 @@ command searches the process table on th
 processes that match the criteria given on the command line.
 .Pp
 The following options are available:
-.Bl -tag -width ".Fl d Ar delim"
+.Bl -tag -width ".Fl F Ar pidfile"
+.It Fl F Ar pidfile
+Restrict matches to process which pid is stored in
+.Ar pidfile
+file.
 .It Fl G Ar gid
 Restrict matches to processes with a real group ID in the comma-separated
 list
Index: pkill.c
===================================================================
RCS file: /private/FreeBSD/src/usr.bin/pkill/pkill.c,v
retrieving revision 1.18
diff -u -p -r1.18 pkill.c
--- pkill.c	15 Jul 2004 08:10:26 -0000	1.18
+++ pkill.c	25 Oct 2004 19:33:24 -0000
@@ -69,6 +69,9 @@ __FBSDID("$FreeBSD: src/usr.bin/pkill/pk
 #define	STATUS_BADUSAGE	2
 #define	STATUS_ERROR	3
 
+#define	MIN_PID		5
+#define	MAX_PID		99999
+
 /* Check for system-processes which should always be ignored. */
 #define	IS_KERNPROC(kp)	((kp)->ki_flag & P_KTHREAD)
 
@@ -115,6 +118,7 @@ void	usage(void);
 void	killact(struct kinfo_proc *);
 void	grepact(struct kinfo_proc *);
 void	makelist(struct listhead *, enum listtype, char *);
+int	takepid(const char *);
 
 int
 main(int argc, char **argv)
@@ -124,7 +128,7 @@ main(int argc, char **argv)
 	char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q;
 	const char *execf, *coref;
 	int debug_opt;
-	int i, ch, bestidx, rv, criteria, drop_privs;
+	int i, ch, bestidx, rv, criteria, drop_privs, pidfromfile;
 	size_t jsz;
 	void (*action)(struct kinfo_proc *);
 	struct kinfo_proc *kp;
@@ -167,13 +171,18 @@ main(int argc, char **argv)
 	criteria = 0;
 	debug_opt = 0;
 	drop_privs = 0;
+	pidfromfile = -1;
 	execf = coref = _PATH_DEVNULL;
 
-	while ((ch = getopt(argc, argv, "DG:M:N:P:U:d:fg:lns:t:u:vx")) != -1)
+	while ((ch = getopt(argc, argv, "DF:G:M:N:P:U:d:fg:lns:t:u:vx")) != -1)
 		switch (ch) {
 		case 'D':
 			debug_opt++;
 			break;
+		case 'F':
+			pidfromfile = takepid(optarg);
+			criteria = 1;
+			break;
 		case 'G':
 			makelist(&rgidlist, LT_GROUP, optarg);
 			criteria = 1;
@@ -342,6 +351,11 @@ main(int argc, char **argv)
 		if (IS_KERNPROC(kp) != 0)
 			continue;
 
+		if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) {
+			selected[i] = 0;
+			continue;
+		}
+
 		SLIST_FOREACH(li, &ruidlist, li_chain)
 			if (kp->ki_ruid == (uid_t)li->li_number)
 				break;
@@ -590,3 +604,33 @@ makelist(struct listhead *head, enum lis
 	if (empty)
 		usage();
 }
+
+int
+takepid(const char *pidfile)
+{
+	char *endp, line[BUFSIZ];
+	FILE *fh;
+	long rval;
+
+	fh = fopen(pidfile, "r");
+	if (fh == NULL)
+		err(STATUS_ERROR, "can't open pid file `%s'", pidfile);
+
+	if (fgets(line, sizeof(line), fh) == NULL) {
+		if (feof(fh)) {
+			(void)fclose(fh);
+			errx(STATUS_ERROR, "pid file `%s' is empty", pidfile);
+		}
+		(void)fclose(fh);
+		err(STATUS_ERROR, "can't read from pid file `%s'", pidfile);
+	}
+	(void)fclose(fh);
+
+	errno = 0;
+	rval = strtol(line, &endp, 10);
+	if (*endp != '\0' && !isspace(*endp))
+		errx(STATUS_ERROR, "invalid pid in file `%s'", pidfile);
+	else if (rval < MIN_PID || rval > MAX_PID)
+		errx(STATUS_ERROR, "invalid pid in file `%s'", pidfile);
+	return (rval);
+}