265 lines
6.4 KiB
C
265 lines
6.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini ps implementation(s) for busybox
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*
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* Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
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* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* This contains _two_ implementations of ps for Linux. One uses the
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* traditional /proc virtual filesystem, and the other use the devps kernel
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* driver (written by Erik Andersen to avoid using /proc thereby saving 100k+).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <string.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include "busybox.h"
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static const int TERMINAL_WIDTH = 79; /* not 80 in case terminal has linefold bug */
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#if ! defined CONFIG_FEATURE_USE_DEVPS_PATCH
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/* The following is the first ps implementation --
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* the one using the /proc virtual filesystem.
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*/
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typedef struct proc_s {
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char
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cmd[16]; /* basename of executable file in call to exec(2) */
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int
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ruid, /* real only (sorry) */
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pid, /* process id */
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ppid; /* pid of parent process */
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char
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state; /* single-char code for process state (S=sleeping) */
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} proc_t;
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static int file2str(char *filename, char *ret, int cap)
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{
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int fd, num_read;
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if ((fd = open(filename, O_RDONLY, 0)) == -1)
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return -1;
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if ((num_read = read(fd, ret, cap - 1)) <= 0)
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return -1;
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ret[num_read] = 0;
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close(fd);
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return num_read;
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}
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static void parse_proc_status(char *S, proc_t * P)
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{
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char *tmp;
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memset(P->cmd, 0, sizeof P->cmd);
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sscanf(S, "Name:\t%15c", P->cmd);
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tmp = strchr(P->cmd, '\n');
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if (tmp)
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*tmp = '\0';
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tmp = strstr(S, "State");
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sscanf(tmp, "State:\t%c", &P->state);
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tmp = strstr(S, "Pid:");
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if (tmp)
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sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid);
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else
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error_msg("Internal error!");
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/* For busybox, ignoring effective, saved, etc. */
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tmp = strstr(S, "Uid:");
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if (tmp)
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sscanf(tmp, "Uid:\t%d", &P->ruid);
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else
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error_msg("Internal error!");
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}
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extern int ps_main(int argc, char **argv)
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{
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proc_t p;
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DIR *dir;
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FILE *file;
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struct dirent *entry;
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char path[32], sbuf[512];
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char uidName[9];
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int len, i, c;
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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struct winsize win = { 0, 0, 0, 0 };
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int terminal_width = TERMINAL_WIDTH;
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#else
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#define terminal_width TERMINAL_WIDTH
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#endif
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dir = opendir("/proc");
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if (!dir)
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error_msg_and_die("Can't open /proc");
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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ioctl(fileno(stdout), TIOCGWINSZ, &win);
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if (win.ws_col > 0)
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terminal_width = win.ws_col - 1;
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#endif
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printf(" PID Uid Stat Command\n");
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while ((entry = readdir(dir)) != NULL) {
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if (!isdigit(*entry->d_name))
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continue;
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sprintf(path, "/proc/%s/status", entry->d_name);
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if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
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parse_proc_status(sbuf, &p);
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}
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/* Make some adjustments as needed */
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my_getpwuid(uidName, p.ruid);
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if (*uidName == '\0')
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sprintf(uidName, "%d", p.ruid);
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sprintf(path, "/proc/%s/cmdline", entry->d_name);
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file = fopen(path, "r");
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if (file == NULL)
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continue;
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i = 0;
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len = printf("%5d %-8s %c ", p.pid, uidName, p.state);
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while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) {
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i++;
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if (c == '\0')
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c = ' ';
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putc(c, stdout);
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}
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fclose(file);
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if (i == 0)
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printf("[%s]", p.cmd);
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putchar('\n');
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}
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closedir(dir);
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return EXIT_SUCCESS;
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}
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#else /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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/* The following is the second ps implementation --
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* this one uses the nifty new devps kernel device.
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*/
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#include <linux/devps.h> /* For Erik's nifty devps device driver */
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extern int ps_main(int argc, char **argv)
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{
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char device[] = "/dev/ps";
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int i, j, len, fd;
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pid_t num_pids;
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pid_t* pid_array = NULL;
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struct pid_info info;
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char uidName[9];
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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struct winsize win = { 0, 0, 0, 0 };
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int terminal_width = TERMINAL_WIDTH;
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#else
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#define terminal_width TERMINAL_WIDTH
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#endif
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if (argc > 1 && **(argv + 1) == '-')
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show_usage();
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/* open device */
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fd = open(device, O_RDONLY);
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if (fd < 0)
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perror_msg_and_die( "open failed for `%s'", device);
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/* Find out how many processes there are */
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if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
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perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
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/* Allocate some memory -- grab a few extras just in case
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* some new processes start up while we wait. The kernel will
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* just ignore any extras if we give it too many, and will trunc.
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* the list if we give it too few. */
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pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
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pid_array[0] = num_pids+10;
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/* Now grab the pid list */
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if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_LIST");
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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ioctl(fileno(stdout), TIOCGWINSZ, &win);
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if (win.ws_col > 0)
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terminal_width = win.ws_col - 1;
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#endif
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/* Print up a ps listing */
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printf(" PID Uid Stat Command\n");
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for (i=1; i<pid_array[0] ; i++) {
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info.pid = pid_array[i];
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if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_INFO");
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/* Make some adjustments as needed */
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my_getpwuid(uidName, info.euid);
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if (*uidName == '\0')
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sprintf(uidName, "%ld", info.euid);
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len = printf("%5d %-8s %c ", info.pid, uidName, info.state);
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if (strlen(info.command_line) > 1) {
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for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
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if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
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*(info.command_line+j) = ' ';
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}
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}
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*(info.command_line+j) = '\0';
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puts(info.command_line);
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} else {
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printf("[%s]\n", info.name);
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}
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}
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/* Free memory */
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free( pid_array);
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/* close device */
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if (close (fd) != 0)
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perror_msg_and_die("close failed for `%s'", device);
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exit (0);
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}
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#endif /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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