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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 *
5 * Copyright (C) 1999 by Lineo, inc. Written by Erik Andersen
6 * <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 Andersen246cc6d2000-03-07 07:41:42 +000041#if ! defined BB_FEATURE_USE_DEVPS_N_DEVMTAB
42
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 Andersen246cc6d2000-03-07 07:41:42 +0000131 if (argc > 1 && **(argv + 1) == '-')
132 usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
Eric Andersenef8b6c71999-10-20 08:05:35 +0000133
Erik Andersene49d5ec2000-02-08 19:58:47 +0000134 dir = opendir("/proc");
Erik Andersen246cc6d2000-03-07 07:41:42 +0000135 if (!dir)
136 fatalError("Can't open /proc");
Eric Andersend23f9ba1999-10-20 19:18:15 +0000137
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000138#ifdef BB_FEATURE_AUTOWIDTH
139 ioctl(fileno(stdout), TIOCGWINSZ, &win);
140 if (win.ws_col > 0)
141 terminal_width = win.ws_col - 1;
142#endif
143
Erik Andersene49d5ec2000-02-08 19:58:47 +0000144 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
145 "State", "Command");
146 while ((entry = readdir(dir)) != NULL) {
147 uidName[0] = '\0';
148 groupName[0] = '\0';
149
150 if (!isdigit(*entry->d_name))
151 continue;
152 sprintf(path, "/proc/%s/status", entry->d_name);
153 if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
154 parse_proc_status(sbuf, &p);
155 }
156
157 /* Make some adjustments as needed */
158 my_getpwuid(uidName, p.ruid);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000159 if (*uidName == '\0')
160 sprintf(uidName, "%d", p.ruid);
Erik Andersen246cc6d2000-03-07 07:41:42 +0000161 my_getgrgid(groupName, p.rgid);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000162 if (*groupName == '\0')
163 sprintf(groupName, "%d", p.rgid);
164
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000165 len = fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName,
Erik Andersene49d5ec2000-02-08 19:58:47 +0000166 p.state);
167 sprintf(path, "/proc/%s/cmdline", entry->d_name);
168 file = fopen(path, "r");
Erik Andersen246cc6d2000-03-07 07:41:42 +0000169 if (file == NULL)
170 fatalError("Can't open %s: %s\n", path, strerror(errno));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000171 i = 0;
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000172 while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000173 i++;
174 if (c == '\0')
175 c = ' ';
176 putc(c, stdout);
177 }
178 if (i == 0)
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000179 fprintf(stdout, "[%s]", p.cmd);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000180 fprintf(stdout, "\n");
Eric Andersend23f9ba1999-10-20 19:18:15 +0000181 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000182 closedir(dir);
183 exit(TRUE);
Eric Andersenef8b6c71999-10-20 08:05:35 +0000184}
Erik Andersen246cc6d2000-03-07 07:41:42 +0000185
186
187#else /* BB_FEATURE_USE_DEVPS_N_DEVMTAB */
188
189
190/* The following is the second ps implementation --
191 * this one uses the nifty new devps kernel device.
192 */
193
Erik Andersen246cc6d2000-03-07 07:41:42 +0000194#include <linux/devps.h>
195
196
197extern int ps_main(int argc, char **argv)
198{
199 char device[] = "/dev/ps";
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000200 int i, j, len, fd;
Erik Andersen246cc6d2000-03-07 07:41:42 +0000201 pid_t num_pids;
202 pid_t* pid_array = NULL;
203 struct pid_info info;
204 char uidName[10] = "";
205 char groupName[10] = "";
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000206#ifdef BB_FEATURE_AUTOWIDTH
207 struct winsize win = { 0, 0 };
208 int terminal_width = 0;
209#else
210#define terminal_width 79
211#endif
Erik Andersen246cc6d2000-03-07 07:41:42 +0000212
213 if (argc > 1 && **(argv + 1) == '-')
214 usage("ps-devps\n\nReport process status\n\nThis version of ps accepts no options.\n\n");
215
216 /* open device */
217 fd = open(device, O_RDONLY);
218 if (fd < 0)
219 fatalError( "open failed for `%s': %s\n", device, strerror (errno));
220
221 /* Find out how many processes there are */
222 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
223 fatalError( "\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
224
225 /* Allocate some memory -- grab a few extras just in case
226 * some new processes start up while we wait. The kernel will
227 * just ignore any extras if we give it too many, and will trunc.
228 * the list if we give it too few. */
229 pid_array = (pid_t*) calloc( num_pids+10, sizeof(pid_t));
230 pid_array[0] = num_pids+10;
231
232 /* Now grab the pid list */
233 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
234 fatalError("\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
235
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000236#ifdef BB_FEATURE_AUTOWIDTH
237 ioctl(fileno(stdout), TIOCGWINSZ, &win);
238 if (win.ws_col > 0)
239 terminal_width = win.ws_col - 1;
240#endif
241
Erik Andersen246cc6d2000-03-07 07:41:42 +0000242 /* Print up a ps listing */
243 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
244 "State", "Command");
245
246 for (i=1; i<pid_array[0] ; i++) {
247 uidName[0] = '\0';
248 groupName[0] = '\0';
249 info.pid = pid_array[i];
250
251 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
252 fatalError("\nDEVPS_GET_PID_INFO: %s\n", strerror (errno));
253
254 /* Make some adjustments as needed */
255 my_getpwuid(uidName, info.euid);
256 if (*uidName == '\0')
257 sprintf(uidName, "%ld", info.euid);
258 my_getgrgid(groupName, info.egid);
259 if (*groupName == '\0')
260 sprintf(groupName, "%ld", info.egid);
261
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000262 len = fprintf(stdout, "%5d %-8s %-8s %c ", info.pid, uidName, groupName, info.state);
Erik Andersen246cc6d2000-03-07 07:41:42 +0000263
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000264 if (strlen(info.command_line) > 1) {
265 for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
266 if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
267 *(info.command_line+j) = ' ';
268 }
269 }
270 *(info.command_line+j) = '\0';
Erik Andersen246cc6d2000-03-07 07:41:42 +0000271 fprintf(stdout, "%s\n", info.command_line);
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000272 } else {
Erik Andersen246cc6d2000-03-07 07:41:42 +0000273 fprintf(stdout, "[%s]\n", info.name);
Erik Andersen2ac2fae2000-03-07 23:32:17 +0000274 }
Erik Andersen246cc6d2000-03-07 07:41:42 +0000275 }
276
277 /* Free memory */
278 free( pid_array);
279
280 /* close device */
281 if (close (fd) != 0)
282 fatalError("close failed for `%s': %s\n", device, strerror (errno));
283
284 exit (0);
285}
286
287#endif /* BB_FEATURE_USE_DEVPS_N_DEVMTAB */
288