| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini ps implementation(s) for busybox |
| * |
| * Copyright (C) 1999,2000,2001 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> |
| * |
| * |
| * This contains _two_ implementations of ps for Linux. One uses the |
| * traditional /proc virtual filesystem, and the other use the devps kernel |
| * driver (written by Erik Andersen to avoid using /proc thereby saving 100k+). |
| * |
| * |
| * |
| * 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 <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <ctype.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include "busybox.h" |
| |
| static const int TERMINAL_WIDTH = 79; /* not 80 in case terminal has linefold bug */ |
| |
| |
| |
| #if ! defined BB_FEATURE_USE_DEVPS_PATCH |
| |
| /* The following is the first ps implementation -- |
| * the one using the /proc virtual filesystem. |
| */ |
| |
| 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 |
| error_msg("Internal error!"); |
| |
| /* For busybox, ignoring effective, saved, etc. */ |
| tmp = strstr(S, "Uid:"); |
| if (tmp) |
| sscanf(tmp, "Uid:\t%d", &P->ruid); |
| else |
| error_msg("Internal error!"); |
| |
| tmp = strstr(S, "Gid:"); |
| if (tmp) |
| sscanf(tmp, "Gid:\t%d", &P->rgid); |
| else |
| error_msg("Internal error!"); |
| |
| } |
| |
| 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[9]; |
| char groupName[9]; |
| int len, i, c; |
| #ifdef BB_FEATURE_AUTOWIDTH |
| struct winsize win = { 0, 0, 0, 0 }; |
| int terminal_width = TERMINAL_WIDTH; |
| #else |
| #define terminal_width TERMINAL_WIDTH |
| #endif |
| |
| |
| |
| dir = opendir("/proc"); |
| if (!dir) |
| error_msg_and_die("Can't open /proc"); |
| |
| #ifdef BB_FEATURE_AUTOWIDTH |
| ioctl(fileno(stdout), TIOCGWINSZ, &win); |
| if (win.ws_col > 0) |
| terminal_width = win.ws_col - 1; |
| #endif |
| |
| printf("%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command"); |
| while ((entry = readdir(dir)) != NULL) { |
| 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); |
| if (*uidName == '\0') |
| sprintf(uidName, "%d", p.ruid); |
| my_getgrgid(groupName, p.rgid); |
| if (*groupName == '\0') |
| sprintf(groupName, "%d", p.rgid); |
| |
| sprintf(path, "/proc/%s/cmdline", entry->d_name); |
| file = fopen(path, "r"); |
| if (file == NULL) |
| continue; |
| i = 0; |
| len = printf("%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state); |
| while (((c = getc(file)) != EOF) && (i < (terminal_width-len))) { |
| i++; |
| if (c == '\0') |
| c = ' '; |
| putc(c, stdout); |
| } |
| fclose(file); |
| if (i == 0) |
| printf("[%s]", p.cmd); |
| putchar('\n'); |
| } |
| closedir(dir); |
| return EXIT_SUCCESS; |
| } |
| |
| |
| #else /* BB_FEATURE_USE_DEVPS_PATCH */ |
| |
| |
| /* The following is the second ps implementation -- |
| * this one uses the nifty new devps kernel device. |
| */ |
| |
| #include <linux/devps.h> /* For Erik's nifty devps device driver */ |
| |
| |
| extern int ps_main(int argc, char **argv) |
| { |
| char device[] = "/dev/ps"; |
| int i, j, len, fd; |
| pid_t num_pids; |
| pid_t* pid_array = NULL; |
| struct pid_info info; |
| char uidName[9]; |
| char groupName[9]; |
| #ifdef BB_FEATURE_AUTOWIDTH |
| struct winsize win = { 0, 0, 0, 0 }; |
| int terminal_width = TERMINAL_WIDTH; |
| #else |
| #define terminal_width TERMINAL_WIDTH |
| #endif |
| |
| if (argc > 1 && **(argv + 1) == '-') |
| show_usage(); |
| |
| /* open device */ |
| fd = open(device, O_RDONLY); |
| if (fd < 0) |
| perror_msg_and_die( "open failed for `%s'", device); |
| |
| /* Find out how many processes there are */ |
| if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0) |
| perror_msg_and_die( "\nDEVPS_GET_PID_LIST"); |
| |
| /* Allocate some memory -- grab a few extras just in case |
| * some new processes start up while we wait. The kernel will |
| * just ignore any extras if we give it too many, and will trunc. |
| * the list if we give it too few. */ |
| pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t)); |
| pid_array[0] = num_pids+10; |
| |
| /* Now grab the pid list */ |
| if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0) |
| perror_msg_and_die("\nDEVPS_GET_PID_LIST"); |
| |
| #ifdef BB_FEATURE_AUTOWIDTH |
| ioctl(fileno(stdout), TIOCGWINSZ, &win); |
| if (win.ws_col > 0) |
| terminal_width = win.ws_col - 1; |
| #endif |
| |
| /* Print up a ps listing */ |
| printf("%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command"); |
| |
| for (i=1; i<pid_array[0] ; i++) { |
| info.pid = pid_array[i]; |
| |
| if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0) |
| perror_msg_and_die("\nDEVPS_GET_PID_INFO"); |
| |
| /* Make some adjustments as needed */ |
| my_getpwuid(uidName, info.euid); |
| if (*uidName == '\0') |
| sprintf(uidName, "%ld", info.euid); |
| my_getgrgid(groupName, info.egid); |
| if (*groupName == '\0') |
| sprintf(groupName, "%ld", info.egid); |
| |
| len = printf("%5d %-8s %-8s %c ", info.pid, uidName, groupName, info.state); |
| |
| if (strlen(info.command_line) > 1) { |
| for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) { |
| if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') { |
| *(info.command_line+j) = ' '; |
| } |
| } |
| *(info.command_line+j) = '\0'; |
| puts(info.command_line); |
| } else { |
| printf("[%s]\n", info.name); |
| } |
| } |
| |
| /* Free memory */ |
| free( pid_array); |
| |
| /* close device */ |
| if (close (fd) != 0) |
| perror_msg_and_die("close failed for `%s'", device); |
| |
| exit (0); |
| } |
| |
| #endif /* BB_FEATURE_USE_DEVPS_PATCH */ |
| |