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
40 #include <sys/ioctl.h>
41 #define BB_DECLARE_EXTERN
45 static const int TERMINAL_WIDTH = 79; /* not 80 in case terminal has linefold bug */
49 #if ! defined BB_FEATURE_USE_DEVPS_PATCH
51 /* The following is the first ps implementation --
52 * the one using the /proc virtual filesystem.
55 typedef struct proc_s {
57 cmd[16]; /* basename of executable file in call to exec(2) */
59 ruid, rgid, /* real only (sorry) */
61 ppid; /* pid of parent process */
63 state; /* single-char code for process state (S=sleeping) */
68 static int file2str(char *filename, char *ret, int cap)
72 if ((fd = open(filename, O_RDONLY, 0)) == -1)
74 if ((num_read = read(fd, ret, cap - 1)) <= 0)
82 static void parse_proc_status(char *S, proc_t * P)
86 memset(P->cmd, 0, sizeof P->cmd);
87 sscanf(S, "Name:\t%15c", P->cmd);
88 tmp = strchr(P->cmd, '\n');
91 tmp = strstr(S, "State");
92 sscanf(tmp, "State:\t%c", &P->state);
94 tmp = strstr(S, "Pid:");
96 sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid);
98 error_msg("Internal error!");
100 /* For busybox, ignoring effective, saved, etc */
101 tmp = strstr(S, "Uid:");
103 sscanf(tmp, "Uid:\t%d", &P->ruid);
105 error_msg("Internal error!");
107 tmp = strstr(S, "Gid:");
109 sscanf(tmp, "Gid:\t%d", &P->rgid);
111 error_msg("Internal error!");
115 extern int ps_main(int argc, char **argv)
120 struct dirent *entry;
121 char path[32], sbuf[512];
125 #ifdef BB_FEATURE_AUTOWIDTH
126 struct winsize win = { 0, 0, 0, 0 };
127 int terminal_width = TERMINAL_WIDTH;
129 #define terminal_width TERMINAL_WIDTH
134 dir = opendir("/proc");
136 error_msg_and_die("Can't open /proc");
138 #ifdef BB_FEATURE_AUTOWIDTH
139 ioctl(fileno(stdout), TIOCGWINSZ, &win);
141 terminal_width = win.ws_col - 1;
144 printf("%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
145 while ((entry = readdir(dir)) != NULL) {
146 if (!isdigit(*entry->d_name))
148 sprintf(path, "/proc/%s/status", entry->d_name);
149 if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
150 parse_proc_status(sbuf, &p);
153 /* Make some adjustments as needed */
154 my_getpwuid(uidName, p.ruid);
155 if (*uidName == '\0')
156 sprintf(uidName, "%d", p.ruid);
157 my_getgrgid(groupName, p.rgid);
158 if (*groupName == '\0')
159 sprintf(groupName, "%d", p.rgid);
161 sprintf(path, "/proc/%s/cmdline", entry->d_name);
162 file = fopen(path, "r");
166 len = printf("%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
167 while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) {
175 printf("[%s]", p.cmd);
183 #else /* BB_FEATURE_USE_DEVPS_PATCH */
186 /* The following is the second ps implementation --
187 * this one uses the nifty new devps kernel device.
190 #include <linux/devps.h> /* For Erik's nifty devps device driver */
193 extern int ps_main(int argc, char **argv)
195 char device[] = "/dev/ps";
198 pid_t* pid_array = NULL;
199 struct pid_info info;
202 #ifdef BB_FEATURE_AUTOWIDTH
203 struct winsize win = { 0, 0, 0, 0 };
204 int terminal_width = TERMINAL_WIDTH;
206 #define terminal_width TERMINAL_WIDTH
209 if (argc > 1 && **(argv + 1) == '-')
213 fd = open(device, O_RDONLY);
215 perror_msg_and_die( "open failed for `%s'", device);
217 /* Find out how many processes there are */
218 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
219 perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
221 /* Allocate some memory -- grab a few extras just in case
222 * some new processes start up while we wait. The kernel will
223 * just ignore any extras if we give it too many, and will trunc.
224 * the list if we give it too few. */
225 pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
226 pid_array[0] = num_pids+10;
228 /* Now grab the pid list */
229 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
230 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
232 #ifdef BB_FEATURE_AUTOWIDTH
233 ioctl(fileno(stdout), TIOCGWINSZ, &win);
235 terminal_width = win.ws_col - 1;
238 /* Print up a ps listing */
239 printf("%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
241 for (i=1; i<pid_array[0] ; i++) {
242 info.pid = pid_array[i];
244 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
245 perror_msg_and_die("\nDEVPS_GET_PID_INFO");
247 /* Make some adjustments as needed */
248 my_getpwuid(uidName, info.euid);
249 if (*uidName == '\0')
250 sprintf(uidName, "%ld", info.euid);
251 my_getgrgid(groupName, info.egid);
252 if (*groupName == '\0')
253 sprintf(groupName, "%ld", info.egid);
255 len = printf("%5d %-8s %-8s %c ", info.pid, uidName, groupName, info.state);
257 if (strlen(info.command_line) > 1) {
258 for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
259 if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
260 *(info.command_line+j) = ' ';
263 *(info.command_line+j) = '\0';
264 puts(info.command_line);
266 printf("[%s]\n", info.name);
275 perror_msg_and_die("close failed for `%s'", device);
280 #endif /* BB_FEATURE_USE_DEVPS_PATCH */