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Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersenef8b6c71999-10-20 08:05:35 +00002/*
Erik Andersen246cc6d2000-03-07 07:41:42 +00003 * Mini ps implementation(s) for busybox
4 *
Erik Andersen61677fe2000-04-13 01:18:56 +00005 * Copyright (C) 1999,2000 by Lineo, inc. Written by Erik Andersen
Erik Andersen246cc6d2000-03-07 07:41:42 +00006 * <andersen@lineo.com>, <andersee@debian.org>
Eric Andersenef8b6c71999-10-20 08:05:35 +00007 *
Eric Andersenc4996011999-10-20 22:08:37 +00008 *
Erik Andersen246cc6d2000-03-07 07:41:42 +00009 * 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+).
Eric Andersenef8b6c71999-10-20 08:05:35 +000012 *
Eric Andersenef8b6c71999-10-20 08:05:35 +000013 *
Eric Andersenef8b6c71999-10-20 08:05:35 +000014 *
Erik Andersen246cc6d2000-03-07 07:41:42 +000015 * 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)
18 * any later version.
19 *
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
23 * more details.
24 *
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
Eric Andersenef8b6c71999-10-20 08:05:35 +000028 *
29 */
30
31#include "internal.h"
Erik Andersen246cc6d2000-03-07 07:41:42 +000032#include <stdio.h>
Eric Andersenef8b6c71999-10-20 08:05:35 +000033#include <unistd.h>
34#include <dirent.h>
Erik Andersen246cc6d2000-03-07 07:41:42 +000035#include <errno.h>
Eric Andersend23f9ba1999-10-20 19:18:15 +000036#include <fcntl.h>
37#include <ctype.h>
Erik Andersen2ac2fae2000-03-07 23:32:17 +000038#include <sys/ioctl.h>
39
Eric Andersend23f9ba1999-10-20 19:18:15 +000040
Erik Andersen269bba22000-03-08 14:50:47 +000041#if ! defined BB_FEATURE_USE_DEVPS_PATCH
Erik Andersen246cc6d2000-03-07 07:41:42 +000042
43/* The following is the first ps implementation --
44 * the one using the /proc virtual filesystem.
45 */
46
Eric Andersen0ecb54a1999-12-05 23:24:55 +000047#if ! defined BB_FEATURE_USE_PROCFS
48#error Sorry, I depend on the /proc filesystem right now.
49#endif
Eric Andersend23f9ba1999-10-20 19:18:15 +000050
51typedef struct proc_s {
Erik Andersene49d5ec2000-02-08 19:58:47 +000052 char
53 cmd[16]; /* basename of executable file in call to exec(2) */
54 int
55 ruid, rgid, /* real only (sorry) */
56 pid, /* process id */
57 ppid; /* pid of parent process */
58 char
59 state; /* single-char code for process state (S=sleeping) */
Eric Andersend23f9ba1999-10-20 19:18:15 +000060} proc_t;
61
62
63
Erik Andersene49d5ec2000-02-08 19:58:47 +000064static int file2str(char *filename, char *ret, int cap)
Eric Andersend23f9ba1999-10-20 19:18:15 +000065{
Erik Andersene49d5ec2000-02-08 19:58:47 +000066 int fd, num_read;
Eric Andersend23f9ba1999-10-20 19:18:15 +000067
Erik Andersene49d5ec2000-02-08 19:58:47 +000068 if ((fd = open(filename, O_RDONLY, 0)) == -1)
69 return -1;
70 if ((num_read = read(fd, ret, cap - 1)) <= 0)
71 return -1;
72 ret[num_read] = 0;
73 close(fd);
74 return num_read;
Eric Andersend23f9ba1999-10-20 19:18:15 +000075}
76
77
Erik Andersene49d5ec2000-02-08 19:58:47 +000078static void parse_proc_status(char *S, proc_t * P)
Eric Andersend23f9ba1999-10-20 19:18:15 +000079{
Erik Andersene49d5ec2000-02-08 19:58:47 +000080 char *tmp;
Eric Andersend23f9ba1999-10-20 19:18:15 +000081
Erik Andersene49d5ec2000-02-08 19:58:47 +000082 memset(P->cmd, 0, sizeof P->cmd);
83 sscanf(S, "Name:\t%15c", P->cmd);
84 tmp = strchr(P->cmd, '\n');
85 if (tmp)
86 *tmp = '\0';
87 tmp = strstr(S, "State");
88 sscanf(tmp, "State:\t%c", &P->state);
Eric Andersend23f9ba1999-10-20 19:18:15 +000089
Erik Andersene49d5ec2000-02-08 19:58:47 +000090 tmp = strstr(S, "Pid:");
91 if (tmp)
92 sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid);
93 else
94 fprintf(stderr, "Internal error!\n");
Eric Andersend23f9ba1999-10-20 19:18:15 +000095
Erik Andersene49d5ec2000-02-08 19:58:47 +000096 /* For busybox, ignoring effective, saved, etc */
97 tmp = strstr(S, "Uid:");
98 if (tmp)
99 sscanf(tmp, "Uid:\t%d", &P->ruid);
100 else
101 fprintf(stderr, "Internal error!\n");
102
103 tmp = strstr(S, "Gid:");
104 if (tmp)
105 sscanf(tmp, "Gid:\t%d", &P->rgid);
106 else
107 fprintf(stderr, "Internal error!\n");
Eric Andersend23f9ba1999-10-20 19:18:15 +0000108
109}
Eric Andersenef8b6c71999-10-20 08:05:35 +0000110
111
112extern int ps_main(int argc, char **argv)
113{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000114 proc_t p;
115 DIR *dir;
116 FILE *file;
117 struct dirent *entry;
118 char path[32], sbuf[512];
119 char uidName[10] = "";
120 char groupName[10] = "";
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000121 int len, i, c;
122#ifdef BB_FEATURE_AUTOWIDTH
123 struct winsize win = { 0, 0 };
124 int terminal_width = 0;
125#else
126#define terminal_width 79
127#endif
128
129
Eric Andersenef8b6c71999-10-20 08:05:35 +0000130
Erik Andersena3e57ca2000-04-19 03:38:01 +0000131 if (argc > 1 && strcmp(argv[1], "--help") == 0) {
Erik Andersen246cc6d2000-03-07 07:41:42 +0000132 usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
Erik Andersena3e57ca2000-04-19 03:38:01 +0000133 }
Eric Andersenef8b6c71999-10-20 08:05:35 +0000134
Erik Andersene49d5ec2000-02-08 19:58:47 +0000135 dir = opendir("/proc");
Erik Andersen246cc6d2000-03-07 07:41:42 +0000136 if (!dir)
137 fatalError("Can't open /proc");
Eric Andersend23f9ba1999-10-20 19:18:15 +0000138
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000139#ifdef BB_FEATURE_AUTOWIDTH
140 ioctl(fileno(stdout), TIOCGWINSZ, &win);
141 if (win.ws_col > 0)
142 terminal_width = win.ws_col - 1;
143#endif
144
Erik Andersene49d5ec2000-02-08 19:58:47 +0000145 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
146 "State", "Command");
147 while ((entry = readdir(dir)) != NULL) {
148 uidName[0] = '\0';
149 groupName[0] = '\0';
150
151 if (!isdigit(*entry->d_name))
152 continue;
153 sprintf(path, "/proc/%s/status", entry->d_name);
154 if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
155 parse_proc_status(sbuf, &p);
156 }
157
158 /* Make some adjustments as needed */
159 my_getpwuid(uidName, p.ruid);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000160 if (*uidName == '\0')
161 sprintf(uidName, "%d", p.ruid);
Erik Andersen246cc6d2000-03-07 07:41:42 +0000162 my_getgrgid(groupName, p.rgid);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000163 if (*groupName == '\0')
164 sprintf(groupName, "%d", p.rgid);
165
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000166 len = fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000167 p.state);
168 sprintf(path, "/proc/%s/cmdline", entry->d_name);
169 file = fopen(path, "r");
Erik Andersen246cc6d2000-03-07 07:41:42 +0000170 if (file == NULL)
171 fatalError("Can't open %s: %s\n", path, strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000172 i = 0;
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000173 while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000174 i++;
175 if (c == '\0')
176 c = ' ';
177 putc(c, stdout);
178 }
179 if (i == 0)
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000180 fprintf(stdout, "[%s]", p.cmd);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000181 fprintf(stdout, "\n");
Eric Andersend23f9ba1999-10-20 19:18:15 +0000182 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000183 closedir(dir);
184 exit(TRUE);
Eric Andersenef8b6c71999-10-20 08:05:35 +0000185}
Erik Andersen246cc6d2000-03-07 07:41:42 +0000186
187
Erik Andersen269bba22000-03-08 14:50:47 +0000188#else /* BB_FEATURE_USE_DEVPS_PATCH */
Erik Andersen246cc6d2000-03-07 07:41:42 +0000189
190
191/* The following is the second ps implementation --
192 * this one uses the nifty new devps kernel device.
193 */
194
Erik Andersen246cc6d2000-03-07 07:41:42 +0000195#include <linux/devps.h>
196
197
198extern int ps_main(int argc, char **argv)
199{
200 char device[] = "/dev/ps";
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000201 int i, j, len, fd;
Erik Andersen246cc6d2000-03-07 07:41:42 +0000202 pid_t num_pids;
203 pid_t* pid_array = NULL;
204 struct pid_info info;
205 char uidName[10] = "";
206 char groupName[10] = "";
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000207#ifdef BB_FEATURE_AUTOWIDTH
208 struct winsize win = { 0, 0 };
209 int terminal_width = 0;
210#else
211#define terminal_width 79
212#endif
Erik Andersen246cc6d2000-03-07 07:41:42 +0000213
214 if (argc > 1 && **(argv + 1) == '-')
215 usage("ps-devps\n\nReport process status\n\nThis version of ps accepts no options.\n\n");
216
217 /* open device */
218 fd = open(device, O_RDONLY);
219 if (fd < 0)
220 fatalError( "open failed for `%s': %s\n", device, strerror (errno));
221
222 /* Find out how many processes there are */
223 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
224 fatalError( "\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
225
226 /* Allocate some memory -- grab a few extras just in case
227 * some new processes start up while we wait. The kernel will
228 * just ignore any extras if we give it too many, and will trunc.
229 * the list if we give it too few. */
230 pid_array = (pid_t*) calloc( num_pids+10, sizeof(pid_t));
231 pid_array[0] = num_pids+10;
232
233 /* Now grab the pid list */
234 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
235 fatalError("\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
236
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000237#ifdef BB_FEATURE_AUTOWIDTH
238 ioctl(fileno(stdout), TIOCGWINSZ, &win);
239 if (win.ws_col > 0)
240 terminal_width = win.ws_col - 1;
241#endif
242
Erik Andersen246cc6d2000-03-07 07:41:42 +0000243 /* Print up a ps listing */
244 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
245 "State", "Command");
246
247 for (i=1; i<pid_array[0] ; i++) {
248 uidName[0] = '\0';
249 groupName[0] = '\0';
250 info.pid = pid_array[i];
251
252 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
253 fatalError("\nDEVPS_GET_PID_INFO: %s\n", strerror (errno));
254
255 /* Make some adjustments as needed */
256 my_getpwuid(uidName, info.euid);
257 if (*uidName == '\0')
258 sprintf(uidName, "%ld", info.euid);
259 my_getgrgid(groupName, info.egid);
260 if (*groupName == '\0')
261 sprintf(groupName, "%ld", info.egid);
262
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000263 len = fprintf(stdout, "%5d %-8s %-8s %c ", info.pid, uidName, groupName, info.state);
Erik Andersen246cc6d2000-03-07 07:41:42 +0000264
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000265 if (strlen(info.command_line) > 1) {
266 for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
267 if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
268 *(info.command_line+j) = ' ';
269 }
270 }
271 *(info.command_line+j) = '\0';
Erik Andersen246cc6d2000-03-07 07:41:42 +0000272 fprintf(stdout, "%s\n", info.command_line);
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000273 } else {
Erik Andersen246cc6d2000-03-07 07:41:42 +0000274 fprintf(stdout, "[%s]\n", info.name);
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000275 }
Erik Andersen246cc6d2000-03-07 07:41:42 +0000276 }
277
278 /* Free memory */
279 free( pid_array);
280
281 /* close device */
282 if (close (fd) != 0)
283 fatalError("close failed for `%s': %s\n", device, strerror (errno));
284
285 exit (0);
286}
287
Erik Andersen269bba22000-03-08 14:50:47 +0000288#endif /* BB_FEATURE_USE_DEVPS_PATCH */
Erik Andersen246cc6d2000-03-07 07:41:42 +0000289