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Eric Andersenef8b6c71999-10-20 08:05:35 +00001/*
2 * Mini ps implementation for busybox
3 *
Eric Andersenc4996011999-10-20 22:08:37 +00004 *
5 * Copyright (C) 1999 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
Eric Andersenef8b6c71999-10-20 08:05:35 +00007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include "internal.h"
25#include <unistd.h>
26#include <dirent.h>
27#include <stdio.h>
Eric Andersend23f9ba1999-10-20 19:18:15 +000028#include <fcntl.h>
29#include <ctype.h>
30
31
32typedef struct proc_s {
33 char
34 cmd[16]; /* basename of executable file in call to exec(2) */
35 int
36 ruid, rgid, /* real only (sorry) */
37 pid, /* process id */
38 ppid; /* pid of parent process */
39 char
40 state; /* single-char code for process state (S=sleeping) */
41} proc_t;
42
43
44
45static int file2str(char *filename, char *ret, int cap)
46{
47 int fd, num_read;
48
49 if ( (fd = open(filename, O_RDONLY, 0)) == -1 ) return -1;
50 if ( (num_read = read(fd, ret, cap - 1)) <= 0 ) return -1;
51 ret[num_read] = 0;
52 close(fd);
53 return num_read;
54}
55
56
57static void parse_proc_status(char* S, proc_t* P)
58{
59 char* tmp;
60 memset(P->cmd, 0, sizeof P->cmd);
61 sscanf (S, "Name:\t%15c", P->cmd);
62 tmp = strchr(P->cmd,'\n');
63 if (tmp)
64 *tmp='\0';
65 tmp = strstr (S,"State");
66 sscanf (tmp, "State:\t%c", &P->state);
67
68 tmp = strstr (S,"Pid:");
69 if(tmp) sscanf (tmp,
70 "Pid:\t%d\n"
71 "PPid:\t%d\n",
72 &P->pid,
73 &P->ppid
74 );
75 else fprintf(stderr, "Internal error!\n");
76
Eric Andersen50d63601999-11-09 01:47:36 +000077 /* For busybox, ignoring effective, saved, etc */
Eric Andersend23f9ba1999-10-20 19:18:15 +000078 tmp = strstr (S,"Uid:");
79 if(tmp) sscanf (tmp,
80 "Uid:\t%d", &P->ruid);
81 else fprintf(stderr, "Internal error!\n");
82
83 tmp = strstr (S,"Gid:");
84 if(tmp) sscanf (tmp,
85 "Gid:\t%d", &P->rgid);
86 else fprintf(stderr, "Internal error!\n");
87
88}
Eric Andersenef8b6c71999-10-20 08:05:35 +000089
90
91extern int ps_main(int argc, char **argv)
92{
Eric Andersend23f9ba1999-10-20 19:18:15 +000093 proc_t p;
Eric Andersenef8b6c71999-10-20 08:05:35 +000094 DIR *dir;
95 FILE *file;
96 struct dirent *entry;
Eric Andersend23f9ba1999-10-20 19:18:15 +000097 char path[32], sbuf[512];
98 char uidName[10]="";
99 char groupName[10]="";
100 int i, c;
Eric Andersenef8b6c71999-10-20 08:05:35 +0000101
102 if ( argc>1 && **(argv+1) == '-' ) {
Eric Andersend73dc5b1999-11-10 23:13:02 +0000103 usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
Eric Andersenef8b6c71999-10-20 08:05:35 +0000104 }
105
106 dir = opendir("/proc");
107 if (!dir) {
108 perror("Can't open /proc");
109 exit(FALSE);
110 }
111
Eric Andersend23f9ba1999-10-20 19:18:15 +0000112 fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
Eric Andersenef8b6c71999-10-20 08:05:35 +0000113 while ((entry = readdir(dir)) != NULL) {
Eric Andersend23f9ba1999-10-20 19:18:15 +0000114 uidName[0]='\0';
115 groupName[0]='\0';
116
117 if (! isdigit(*entry->d_name))
Eric Andersenef8b6c71999-10-20 08:05:35 +0000118 continue;
Eric Andersend23f9ba1999-10-20 19:18:15 +0000119 sprintf(path, "/proc/%s/status", entry->d_name);
120 if ((file2str(path, sbuf, sizeof sbuf)) != -1 ) {
121 parse_proc_status(sbuf, &p);
Eric Andersenef8b6c71999-10-20 08:05:35 +0000122 }
Eric Andersenef8b6c71999-10-20 08:05:35 +0000123
Eric Andersend23f9ba1999-10-20 19:18:15 +0000124 /* Make some adjustments as needed */
125 my_getpwuid( uidName, p.ruid);
126 my_getgrgid( groupName, p.rgid);
127 if (*uidName == '\0')
128 sprintf( uidName, "%d", p.ruid);
129 if (*groupName == '\0')
130 sprintf( groupName, "%d", p.rgid);
131
132 fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
133 sprintf(path, "/proc/%s/cmdline", entry->d_name);
134 file = fopen(path, "r");
135 if (file == NULL) {
136 perror(path);
137 exit(FALSE);
138 }
139 i=0;
140 while (((c = getc(file)) != EOF) && (i < 53)) {
141 i++;
142 if (c == '\0')
143 c = ' ';
144 putc(c, stdout);
145 }
146 if (i==0)
147 fprintf(stdout, "%s", p.cmd);
148 fprintf(stdout, "\n");
Eric Andersenef8b6c71999-10-20 08:05:35 +0000149 }
150 closedir(dir);
151 exit(TRUE);
152}