Support -f for ps(1)

Fix missing break in tty.c as well.

proc.h

@@ -27,6 +27,8 @@ struct procstat {
 	long rsslim;
 };
 
+int parsecmdline(pid_t pid, char *buf, size_t siz);
 int parsestat(pid_t pid, struct procstat *ps);
 int proceuid(pid_t pid, uid_t *euid);
+int procuid(pid_t pid, uid_t *euid);
 int validps(const char *path);

ps.c

@@ -1,10 +1,13 @@
 /* See LICENSE file for copyright and license details. */
+#include <sys/sysinfo.h>
 #include <errno.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <limits.h>
+#include <time.h>
+#include <pwd.h>
 #include "proc.h"
 #include "util.h"
 
@@ -15,7 +18,8 @@ static void psr(const char *path);
 enum {
 	PS_aflag = 1 << 0,
 	PS_Aflag = 1 << 1,
-	PS_dflag = 1 << 2
+	PS_dflag = 1 << 2,
+	PS_fflag = 1 << 3
 };
 
 static int flags;
@@ -37,14 +41,17 @@ main(int argc, char *argv[])
 		flags |= PS_Aflag;
 		break;
 	case 'f':
-		eprintf("not implemented\n");
+		flags |= PS_fflag;
+		break;
 	default:
 		usage();
 	} ARGEND;
 
+	if (!(flags & PS_fflag))
 		printf("  PID TTY          TIME CMD\n");
+	else
+		printf("UID        PID  PPID  C STIME TTY          TIME CMD\n");
 	recurse("/proc", psr);
-
 	return 0;
 }
 
@@ -57,10 +64,16 @@ usage(void)
 static void
 psout(struct procstat *ps)
 {
+	char cmdline[BUFSIZ], *cmd;
+	char stimestr[6];
 	char *ttystr, *myttystr;
 	int tty_maj, tty_min;
-	uid_t myeuid, peuid;
+	uid_t myeuid, peuid, puid;
 	unsigned sut;
+	struct sysinfo info;
+	struct tm *tm;
+	time_t start;
+	struct passwd *pw;
 
 	/* Ignore session leaders */
 	if (flags & PS_dflag)
@@ -72,13 +85,15 @@ psout(struct procstat *ps)
 	devtotty(ps->tty_nr, &tty_maj, &tty_min);
 	ttystr = ttytostr(tty_maj, tty_min);
 	/* Only print processes that are associated with
-	 * a terminal */
-	if (ttystr[0] == '?' && (flags & PS_aflag)) {
+	 * a terminal and they are not session leaders */
+	if (flags & PS_aflag) {
+		if (ps->pid == ps->sid || ttystr[0] == '?') {
 			free(ttystr);
 			return;
 		}
+	}
 
-	if (!flags) {
+	if (!(flags & (PS_aflag | PS_Aflag | PS_dflag))) {
 		myttystr = ttyname(STDIN_FILENO);
 		if (myttystr) {
 			if (strcmp(myttystr + strlen("/dev/"), ttystr)) {
@@ -97,8 +112,33 @@ psout(struct procstat *ps)
 		}
 	}
 
+	procuid(ps->pid, &puid);
+	errno = 0;
+	pw = getpwuid(puid);
+	if (errno || !pw)
+		eprintf("getpwuid %d:", puid);
+
+	sysinfo(&info);
+	start = time(NULL) - (info.uptime - (ps->starttime / 100));
+	tm = localtime(&start);
+	strftime(stimestr, sizeof(stimestr),
+		 "%H:%M", tm);
+	if (parsecmdline(ps->pid, cmdline, sizeof(cmdline)) < 0)
+		cmd = ps->comm;
+	else
+		cmd = cmdline;
+
+	if (!(flags & PS_fflag))
 		printf("%5d %-6s   %02u:%02u:%02u %s\n", ps->pid, ttystr,
 		       sut / 3600, (sut % 3600) / 60, sut % 60, ps->comm);
+	else {
+		printf("%-8s %5d %5d  ? %5s %-5s    %02u:%02u:%02u %s%s%s\n",
+		       pw->pw_name, ps->pid,
+		       ps->ppid, stimestr, ttystr,
+		       sut / 3600, (sut % 3600) / 60, sut % 60,
+		       (cmd == ps->comm) ? "[" : "", cmd,
+		       (cmd == ps->comm) ? "]" : "");
+	}
 	free(ttystr);
 }
 

util/proc.c

@@ -1,4 +1,6 @@
 /* See LICENSE file for copyright and license details. */
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
 #include <stdio.h>
@@ -32,6 +34,56 @@ proceuid(pid_t pid, uid_t *euid)
 	return -1;
 }
 
+int
+procuid(pid_t pid, uid_t *uid)
+{
+	FILE *fp;
+	char buf[BUFSIZ], *p;
+	char path[PATH_MAX];
+	uid_t procuid;
+
+	snprintf(path, sizeof(path), "/proc/%d/status", pid);
+	if (!(fp = fopen(path, "r")))
+		eprintf("%s fopen:", path);
+	while (fgets(buf, sizeof(buf), fp)) {
+		if (!strncmp(buf, "Uid:", 4)) {
+			p = buf + strlen("Uid:");
+			sscanf(p, "%u", &procuid);
+			*uid = procuid;
+			fclose(fp);
+			return 0;
+		}
+	}
+	fclose(fp);
+	return -1;
+}
+
+int
+parsecmdline(pid_t pid, char *buf, size_t siz)
+{
+	int fd;
+	char path[PATH_MAX];
+	ssize_t n, i;
+
+	snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		eprintf("open %s:", path);
+	n = read(fd, buf, siz - 1);
+	if (n < 0)
+		eprintf("read %s:", path);
+	if (!n) {
+		close(fd);
+		return -1;
+	}
+	buf[n] = '\0';
+	for (i = 0; i < n; i++)
+		if (buf[i] == '\0')
+			buf[i] = ' ';
+	close(fd);
+	return 0;
+}
+
 int
 parsestat(pid_t pid, struct procstat *ps)
 {

util/tty.c

@@ -30,6 +30,7 @@ ttytostr(int tty_maj, int tty_min)
 		break;
 	case 4:
 		snprintf(ttystr, len, "%s%d", tty, tty_min);
+		break;
 	default:
 		ttystr[0] = '?';
 		ttystr[1] = '\0';