1 /* vi: set sw=4 ts=4: */
3 * Mini ps implementation(s) for busybox
5 * Copyright (C) 1999 by Lineo, inc. Written by Erik Andersen
6 * <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 #if ! defined BB_FEATURE_USE_DEVPS_N_DEVMTAB
41 /* The following is the first ps implementation --
42 * the one using the /proc virtual filesystem.
45 #if ! defined BB_FEATURE_USE_PROCFS
46 #error Sorry, I depend on the /proc filesystem right now.
49 typedef struct proc_s {
51 cmd[16]; /* basename of executable file in call to exec(2) */
53 ruid, rgid, /* real only (sorry) */
55 ppid; /* pid of parent process */
57 state; /* single-char code for process state (S=sleeping) */
62 static int file2str(char *filename, char *ret, int cap)
66 if ((fd = open(filename, O_RDONLY, 0)) == -1)
68 if ((num_read = read(fd, ret, cap - 1)) <= 0)
76 static void parse_proc_status(char *S, proc_t * P)
80 memset(P->cmd, 0, sizeof P->cmd);
81 sscanf(S, "Name:\t%15c", P->cmd);
82 tmp = strchr(P->cmd, '\n');
85 tmp = strstr(S, "State");
86 sscanf(tmp, "State:\t%c", &P->state);
88 tmp = strstr(S, "Pid:");
90 sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid);
92 fprintf(stderr, "Internal error!\n");
94 /* For busybox, ignoring effective, saved, etc */
95 tmp = strstr(S, "Uid:");
97 sscanf(tmp, "Uid:\t%d", &P->ruid);
99 fprintf(stderr, "Internal error!\n");
101 tmp = strstr(S, "Gid:");
103 sscanf(tmp, "Gid:\t%d", &P->rgid);
105 fprintf(stderr, "Internal error!\n");
110 extern int ps_main(int argc, char **argv)
115 struct dirent *entry;
116 char path[32], sbuf[512];
117 char uidName[10] = "";
118 char groupName[10] = "";
121 if (argc > 1 && **(argv + 1) == '-')
122 usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
124 dir = opendir("/proc");
126 fatalError("Can't open /proc");
128 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
130 while ((entry = readdir(dir)) != NULL) {
134 if (!isdigit(*entry->d_name))
136 sprintf(path, "/proc/%s/status", entry->d_name);
137 if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
138 parse_proc_status(sbuf, &p);
141 /* Make some adjustments as needed */
142 my_getpwuid(uidName, p.ruid);
143 if (*uidName == '\0')
144 sprintf(uidName, "%d", p.ruid);
145 my_getgrgid(groupName, p.rgid);
146 if (*groupName == '\0')
147 sprintf(groupName, "%d", p.rgid);
149 fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName,
151 sprintf(path, "/proc/%s/cmdline", entry->d_name);
152 file = fopen(path, "r");
154 fatalError("Can't open %s: %s\n", path, strerror(errno));
156 while (((c = getc(file)) != EOF) && (i < 53)) {
163 fprintf(stdout, "%s", p.cmd);
164 fprintf(stdout, "\n");
171 #else /* BB_FEATURE_USE_DEVPS_N_DEVMTAB */
174 /* The following is the second ps implementation --
175 * this one uses the nifty new devps kernel device.
178 #include <sys/ioctl.h>
179 #include <linux/devps.h>
182 extern int ps_main(int argc, char **argv)
184 char device[] = "/dev/ps";
187 pid_t* pid_array = NULL;
188 struct pid_info info;
189 char uidName[10] = "";
190 char groupName[10] = "";
192 if (argc > 1 && **(argv + 1) == '-')
193 usage("ps-devps\n\nReport process status\n\nThis version of ps accepts no options.\n\n");
196 fd = open(device, O_RDONLY);
198 fatalError( "open failed for `%s': %s\n", device, strerror (errno));
200 /* Find out how many processes there are */
201 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
202 fatalError( "\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
204 /* Allocate some memory -- grab a few extras just in case
205 * some new processes start up while we wait. The kernel will
206 * just ignore any extras if we give it too many, and will trunc.
207 * the list if we give it too few. */
208 pid_array = (pid_t*) calloc( num_pids+10, sizeof(pid_t));
209 pid_array[0] = num_pids+10;
211 /* Now grab the pid list */
212 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
213 fatalError("\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
215 /* Print up a ps listing */
216 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
219 for (i=1; i<pid_array[0] ; i++) {
222 info.pid = pid_array[i];
224 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
225 fatalError("\nDEVPS_GET_PID_INFO: %s\n", strerror (errno));
227 /* Make some adjustments as needed */
228 my_getpwuid(uidName, info.euid);
229 if (*uidName == '\0')
230 sprintf(uidName, "%ld", info.euid);
231 my_getgrgid(groupName, info.egid);
232 if (*groupName == '\0')
233 sprintf(groupName, "%ld", info.egid);
235 fprintf(stdout, "%5d %-8s %-8s %c ", info.pid, uidName, groupName, info.state);
237 if (strlen(info.command_line) > 1)
238 fprintf(stdout, "%s\n", info.command_line);
240 fprintf(stdout, "[%s]\n", info.name);
249 fatalError("close failed for `%s': %s\n", device, strerror (errno));
254 #endif /* BB_FEATURE_USE_DEVPS_N_DEVMTAB */