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Diffstat (limited to 'release/src/router/busybox/ps.c')
| -rw-r--r-- | release/src/router/busybox/ps.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/release/src/router/busybox/ps.c b/release/src/router/busybox/ps.c new file mode 100644 index 00000000..9e96a540 --- /dev/null +++ b/release/src/router/busybox/ps.c @@ -0,0 +1,266 @@ +/* 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 <termios.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, /* 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 <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]; +#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<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); + + len = printf("%5d %-8s %c ", info.pid, uidName, 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 */ + |