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/*
* Mini ps implementation for busybox
*
*
* Copyright (C) 1999 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#if ! defined BB_FEATURE_USE_PROCFS
#error Sorry, I depend on the /proc filesystem right now.
#endif
typedef struct proc_s {
char
cmd[16]; /* basename of executable file in call to exec(2) */
int
ruid, rgid, /* real only (sorry) */
pid, /* process id */
ppid; /* pid of parent process */
char
state; /* single-char code for process state (S=sleeping) */
} proc_t;
static int file2str(char *filename, char *ret, int cap)
{
int fd, num_read;
if ( (fd = open(filename, O_RDONLY, 0)) == -1 ) return -1;
if ( (num_read = read(fd, ret, cap - 1)) <= 0 ) return -1;
ret[num_read] = 0;
close(fd);
return num_read;
}
static void parse_proc_status(char* S, proc_t* P)
{
char* tmp;
memset(P->cmd, 0, sizeof P->cmd);
sscanf (S, "Name:\t%15c", P->cmd);
tmp = strchr(P->cmd,'\n');
if (tmp)
*tmp='\0';
tmp = strstr (S,"State");
sscanf (tmp, "State:\t%c", &P->state);
tmp = strstr (S,"Pid:");
if(tmp) sscanf (tmp,
"Pid:\t%d\n"
"PPid:\t%d\n",
&P->pid,
&P->ppid
);
else fprintf(stderr, "Internal error!\n");
/* For busybox, ignoring effective, saved, etc */
tmp = strstr (S,"Uid:");
if(tmp) sscanf (tmp,
"Uid:\t%d", &P->ruid);
else fprintf(stderr, "Internal error!\n");
tmp = strstr (S,"Gid:");
if(tmp) sscanf (tmp,
"Gid:\t%d", &P->rgid);
else fprintf(stderr, "Internal error!\n");
}
extern int ps_main(int argc, char **argv)
{
proc_t p;
DIR *dir;
FILE *file;
struct dirent *entry;
char path[32], sbuf[512];
char uidName[10]="";
char groupName[10]="";
int i, c;
if ( argc>1 && **(argv+1) == '-' ) {
usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
}
dir = opendir("/proc");
if (!dir) {
perror("Can't open /proc");
exit(FALSE);
}
fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
while ((entry = readdir(dir)) != NULL) {
uidName[0]='\0';
groupName[0]='\0';
if (! isdigit(*entry->d_name))
continue;
sprintf(path, "/proc/%s/status", entry->d_name);
if ((file2str(path, sbuf, sizeof sbuf)) != -1 ) {
parse_proc_status(sbuf, &p);
}
/* Make some adjustments as needed */
my_getpwuid( uidName, p.ruid);
my_getgrgid( groupName, p.rgid);
if (*uidName == '\0')
sprintf( uidName, "%d", p.ruid);
if (*groupName == '\0')
sprintf( groupName, "%d", p.rgid);
fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
sprintf(path, "/proc/%s/cmdline", entry->d_name);
file = fopen(path, "r");
if (file == NULL) {
perror(path);
exit(FALSE);
}
i=0;
while (((c = getc(file)) != EOF) && (i < 53)) {
i++;
if (c == '\0')
c = ' ';
putc(c, stdout);
}
if (i==0)
fprintf(stdout, "%s", p.cmd);
fprintf(stdout, "\n");
}
closedir(dir);
exit(TRUE);
}
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