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, rgid, /* 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!");
104 tmp = strstr(S, "Gid:");
106 sscanf(tmp, "Gid:\t%d", &P->rgid);
108 error_msg("Internal error!");
112 extern int ps_main(int argc, char **argv)
117 struct dirent *entry;
118 char path[32], sbuf[512];
122 #ifdef BB_FEATURE_AUTOWIDTH
123 struct winsize win = { 0, 0, 0, 0 };
124 int terminal_width = TERMINAL_WIDTH;
126 #define terminal_width TERMINAL_WIDTH
131 dir = opendir("/proc");
133 error_msg_and_die("Can't open /proc");
135 #ifdef BB_FEATURE_AUTOWIDTH
136 ioctl(fileno(stdout), TIOCGWINSZ, &win);
138 terminal_width = win.ws_col - 1;
141 printf("%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
142 while ((entry = readdir(dir)) != NULL) {
143 if (!isdigit(*entry->d_name))
145 sprintf(path, "/proc/%s/status", entry->d_name);
146 if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
147 parse_proc_status(sbuf, &p);
150 /* Make some adjustments as needed */
151 my_getpwuid(uidName, p.ruid);
152 if (*uidName == '\0')
153 sprintf(uidName, "%d", p.ruid);
154 my_getgrgid(groupName, p.rgid);
155 if (*groupName == '\0')
156 sprintf(groupName, "%d", p.rgid);
158 sprintf(path, "/proc/%s/cmdline", entry->d_name);
159 file = fopen(path, "r");
163 len = printf("%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
164 while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) {
172 printf("[%s]", p.cmd);
180 #else /* BB_FEATURE_USE_DEVPS_PATCH */
183 /* The following is the second ps implementation --
184 * this one uses the nifty new devps kernel device.
187 #include <linux/devps.h> /* For Erik's nifty devps device driver */
190 extern int ps_main(int argc, char **argv)
192 char device[] = "/dev/ps";
195 pid_t* pid_array = NULL;
196 struct pid_info info;
199 #ifdef BB_FEATURE_AUTOWIDTH
200 struct winsize win = { 0, 0, 0, 0 };
201 int terminal_width = TERMINAL_WIDTH;
203 #define terminal_width TERMINAL_WIDTH
206 if (argc > 1 && **(argv + 1) == '-')
210 fd = open(device, O_RDONLY);
212 perror_msg_and_die( "open failed for `%s'", device);
214 /* Find out how many processes there are */
215 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
216 perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
218 /* Allocate some memory -- grab a few extras just in case
219 * some new processes start up while we wait. The kernel will
220 * just ignore any extras if we give it too many, and will trunc.
221 * the list if we give it too few. */
222 pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
223 pid_array[0] = num_pids+10;
225 /* Now grab the pid list */
226 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
227 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
229 #ifdef BB_FEATURE_AUTOWIDTH
230 ioctl(fileno(stdout), TIOCGWINSZ, &win);
232 terminal_width = win.ws_col - 1;
235 /* Print up a ps listing */
236 printf("%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
238 for (i=1; i<pid_array[0] ; i++) {
239 info.pid = pid_array[i];
241 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
242 perror_msg_and_die("\nDEVPS_GET_PID_INFO");
244 /* Make some adjustments as needed */
245 my_getpwuid(uidName, info.euid);
246 if (*uidName == '\0')
247 sprintf(uidName, "%ld", info.euid);
248 my_getgrgid(groupName, info.egid);
249 if (*groupName == '\0')
250 sprintf(groupName, "%ld", info.egid);
252 len = printf("%5d %-8s %-8s %c ", info.pid, uidName, groupName, info.state);
254 if (strlen(info.command_line) > 1) {
255 for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
256 if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
257 *(info.command_line+j) = ' ';
260 *(info.command_line+j) = '\0';
261 puts(info.command_line);
263 printf("[%s]\n", info.name);
272 perror_msg_and_die("close failed for `%s'", device);
277 #endif /* BB_FEATURE_USE_DEVPS_PATCH */