1 /* vi: set sw=4 ts=4: */
3 * Mini ps implementation(s) for busybox
5 * Copyright (C) 1999,2000,2001 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
9 * This contains _two_ implementations of ps for Linux. One uses the
10 * traditional /proc virtual filesystem, and the other use the devps kernel
11 * driver (written by Erik Andersen to avoid using /proc thereby saving 100k+).
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the Free
17 * Software Foundation; either version 2 of the License, or (at your option)
20 * This program is distributed in the hope that it will be useful, but WITHOUT
21 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
22 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
25 * You should have received a copy of the GNU General Public License along with
26 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
27 * Place, Suite 330, Boston, MA 02111-1307 USA
39 #include <sys/ioctl.h>
42 static const int TERMINAL_WIDTH = 79; /* not 80 in case terminal has linefold bug */
46 #if ! defined BB_FEATURE_USE_DEVPS_PATCH
48 /* The following is the first ps implementation --
49 * the one using the /proc virtual filesystem.
52 typedef struct proc_s {
54 cmd[16]; /* basename of executable file in call to exec(2) */
56 ruid, /* real only (sorry) */
58 ppid; /* pid of parent process */
60 state; /* single-char code for process state (S=sleeping) */
65 static int file2str(char *filename, char *ret, int cap)
69 if ((fd = open(filename, O_RDONLY, 0)) == -1)
71 if ((num_read = read(fd, ret, cap - 1)) <= 0)
79 static void parse_proc_status(char *S, proc_t * P)
83 memset(P->cmd, 0, sizeof P->cmd);
84 sscanf(S, "Name:\t%15c", P->cmd);
85 tmp = strchr(P->cmd, '\n');
88 tmp = strstr(S, "State");
89 sscanf(tmp, "State:\t%c", &P->state);
91 tmp = strstr(S, "Pid:");
93 sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid);
95 error_msg("Internal error!");
97 /* For busybox, ignoring effective, saved, etc. */
98 tmp = strstr(S, "Uid:");
100 sscanf(tmp, "Uid:\t%d", &P->ruid);
102 error_msg("Internal error!");
107 extern int ps_main(int argc, char **argv)
112 struct dirent *entry;
113 char path[32], sbuf[512];
116 #ifdef BB_FEATURE_AUTOWIDTH
117 struct winsize win = { 0, 0, 0, 0 };
118 int terminal_width = TERMINAL_WIDTH;
120 #define terminal_width TERMINAL_WIDTH
125 dir = opendir("/proc");
127 error_msg_and_die("Can't open /proc");
129 #ifdef BB_FEATURE_AUTOWIDTH
130 ioctl(fileno(stdout), TIOCGWINSZ, &win);
132 terminal_width = win.ws_col - 1;
135 printf(" PID Uid Stat Command\n");
136 while ((entry = readdir(dir)) != NULL) {
137 if (!isdigit(*entry->d_name))
139 sprintf(path, "/proc/%s/status", entry->d_name);
140 if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
141 parse_proc_status(sbuf, &p);
144 /* Make some adjustments as needed */
145 my_getpwuid(uidName, p.ruid);
146 if (*uidName == '\0')
147 sprintf(uidName, "%d", p.ruid);
149 sprintf(path, "/proc/%s/cmdline", entry->d_name);
150 file = fopen(path, "r");
154 len = printf("%5d %-8s %c ", p.pid, uidName, p.state);
155 while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) {
163 printf("[%s]", p.cmd);
171 #else /* BB_FEATURE_USE_DEVPS_PATCH */
174 /* The following is the second ps implementation --
175 * this one uses the nifty new devps kernel device.
178 #include <linux/devps.h> /* For Erik's nifty devps device driver */
181 extern int ps_main(int argc, char **argv)
183 char device[] = "/dev/ps";
186 pid_t* pid_array = NULL;
187 struct pid_info info;
189 #ifdef BB_FEATURE_AUTOWIDTH
190 struct winsize win = { 0, 0, 0, 0 };
191 int terminal_width = TERMINAL_WIDTH;
193 #define terminal_width TERMINAL_WIDTH
196 if (argc > 1 && **(argv + 1) == '-')
200 fd = open(device, O_RDONLY);
202 perror_msg_and_die( "open failed for `%s'", device);
204 /* Find out how many processes there are */
205 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
206 perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
208 /* Allocate some memory -- grab a few extras just in case
209 * some new processes start up while we wait. The kernel will
210 * just ignore any extras if we give it too many, and will trunc.
211 * the list if we give it too few. */
212 pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
213 pid_array[0] = num_pids+10;
215 /* Now grab the pid list */
216 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
217 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
219 #ifdef BB_FEATURE_AUTOWIDTH
220 ioctl(fileno(stdout), TIOCGWINSZ, &win);
222 terminal_width = win.ws_col - 1;
225 /* Print up a ps listing */
226 printf(" PID Uid Stat Command\n");
228 for (i=1; i<pid_array[0] ; i++) {
229 info.pid = pid_array[i];
231 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
232 perror_msg_and_die("\nDEVPS_GET_PID_INFO");
234 /* Make some adjustments as needed */
235 my_getpwuid(uidName, info.euid);
236 if (*uidName == '\0')
237 sprintf(uidName, "%ld", info.euid);
239 len = printf("%5d %-8s %c ", info.pid, uidName, info.state);
241 if (strlen(info.command_line) > 1) {
242 for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
243 if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
244 *(info.command_line+j) = ' ';
247 *(info.command_line+j) = '\0';
248 puts(info.command_line);
250 printf("[%s]\n", info.name);
259 perror_msg_and_die("close failed for `%s'", device);
264 #endif /* BB_FEATURE_USE_DEVPS_PATCH */