Index: bin/ps/ps.1
===================================================================
--- bin/ps/ps.1
+++ bin/ps/ps.1
@@ -165,7 +165,7 @@
 .Cm user , pid , ppid , pgid , sid , jobc , state , tt , time ,
 and
 .Cm command .
-.It Fl J
+.It Fl J , Fl Fl jail
 Display information about processes which match the specified jail IDs.
 This may be either the
 .Cm jid
@@ -224,8 +224,11 @@
 option.
 So the header texts for multiple keywords can be changed.
 If all keywords have empty header texts, no header line is written.
-.It Fl p
+.It Fl p , Fl Fl pid
 Display information about processes which match the specified process IDs.
+.It Fl P , Fl Fl ppid
+Display information about processes whose parent matches the specified
+process IDs.
 .It Fl r
 Sort by current CPU usage, instead of the combination of controlling
 terminal and process ID.
@@ -235,7 +238,7 @@
 .It Fl T
 Display information about processes attached to the device associated
 with the standard input.
-.It Fl t
+.It Fl t , Fl Fl tty
 Display information about processes attached to the specified terminal
 devices.
 Full pathnames, as well as abbreviations (see explanation of the
Index: bin/ps/ps.c
===================================================================
--- bin/ps/ps.c
+++ bin/ps/ps.c
@@ -64,6 +64,7 @@
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <getopt.h>
 #include <grp.h>
 #include <jail.h>
 #include <kvm.h>
@@ -170,12 +171,20 @@
 			"%cpu,%mem,command";
 static char Zfmt[] = "label";
 
-#define	PS_ARGS	"AaCcde" OPT_LAZY_f "G:gHhjJ:LlM:mN:O:o:p:rSTt:U:uvwXxZ"
+static struct option longopts[] = {
+	{ "jail", 	required_argument,	NULL,	'J' },
+	{ "pid", 	required_argument,	NULL,	'p' },
+	{ "ppid", 	required_argument,	NULL,	'P' },
+	{ "tty", 	required_argument,	NULL,	't' },
+	{ NULL,		0,					NULL,	0 }
+};
+
+#define	PS_ARGS	"AaCcde" OPT_LAZY_f "G:gHhjJ:LlM:mN:O:o:p:P:rSTt:U:uvwXxZ"
 
 int
 main(int argc, char *argv[])
 {
-	struct listinfo gidlist, jidlist, pgrplist, pidlist;
+	struct listinfo gidlist, jidlist, pgrplist, pidlist, ppidlist;
 	struct listinfo ruidlist, sesslist, ttylist, uidlist;
 	struct kinfo_proc *kp;
 	KINFO *kinfo = NULL, *next_KINFO;
@@ -234,6 +243,7 @@
 	init_list(&jidlist, addelem_jid, sizeof(int), "jail id");
 	init_list(&pgrplist, addelem_pid, sizeof(pid_t), "process group");
 	init_list(&pidlist, addelem_pid, sizeof(pid_t), "process id");
+	init_list(&ppidlist, addelem_pid, sizeof(pid_t), "parent process id");
 	init_list(&ruidlist, addelem_uid, sizeof(uid_t), "ruser");
 	init_list(&sesslist, addelem_pid, sizeof(pid_t), "session id");
 	init_list(&ttylist, addelem_tty, sizeof(dev_t), "tty");
@@ -245,7 +255,7 @@
 	if (argc < 0)
 		exit(1);
 
-	while ((ch = getopt(argc, argv, PS_ARGS)) != -1)
+	while ((ch = getopt_long(argc, argv, PS_ARGS, longopts, NULL)) != -1)
 		switch (ch) {
 		case 'A':
 			/*
@@ -352,6 +362,13 @@
 			 */
 			nselectors++;
 			break;
+		case 'P':
+			/*
+			 * Non-standard option corresponding to Linux --ppid.
+			 */
+			add_list(&ppidlist, optarg);
+			nselectors++;
+			break;
 #if 0
 		case 'R':
 			/*-
@@ -558,6 +575,11 @@
 					if (kp->ki_pid == pidlist.l.pids[elem])
 						goto keepit;
 			}
+			if (ppidlist.count > 0) {
+				for (elem = 0; elem < ppidlist.count; elem++)
+					if (kp->ki_ppid == ppidlist.l.pids[elem])
+						goto keepit;
+			}
 			/*
 			 * Note that we had to process pidlist before
 			 * filtering out processes which do not have
@@ -1453,10 +1475,11 @@
 {
 #define	SINGLE_OPTS	"[-aCcde" OPT_LAZY_f "HhjlmrSTuvwXxZ]"
 
-	(void)xo_error("%s\n%s\n%s\n%s\n",
+	(void)xo_error("%s\n%s\n%s\n%s\n%s\n",
 	    "usage: ps " SINGLE_OPTS " [-O fmt | -o fmt] [-G gid[,gid...]]",
-	    "          [-J jid[,jid...]] [-M core] [-N system]",
-	    "          [-p pid[,pid...]] [-t tty[,tty...]] [-U user[,user...]]",
+	    "          [-J|--jail jid[,jid...]] [-M core] [-N system]",
+	    "          [-p|--pid pid[,pid...]] [-P|--ppid pid[,pid...]]",
+	    "          [-t tty[,tty...]] [-U user[,user...]]",
 	    "       ps [-L]");
 	exit(1);
 }