/* vi: set sw=4 ts=4: */ /* * Mini ps implementation(s) for busybox * * Copyright (C) 1999,2000,2001 by Lineo, inc. * Written by Erik Andersen , * * * 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 #include #include #include #include #include #include #include #include #include #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, /* 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!"); } 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]; 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(" PID Uid Stat Command\n"); 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); sprintf(path, "/proc/%s/cmdline", entry->d_name); file = fopen(path, "r"); if (file == NULL) continue; i = 0; len = printf("%5d %-8s %c ", p.pid, uidName, 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 /* 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]; #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(" PID Uid Stat Command\n"); for (i=1; i 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 */