X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=ps.c;h=dd154af9d889c0aefe72312d50e586b04c135300;hb=825ae5a1665c174c9255ba3abe7ec9711d165c25;hp=207cdaa02726197ad31e34fac985c5dc02906a14;hpb=e49d5ecbbe51718fa925b6890a735e5937cc2aa2;p=oweals%2Fbusybox.git diff --git a/ps.c b/ps.c index 207cdaa02..dd154af9d 100644 --- a/ps.c +++ b/ps.c @@ -1,37 +1,56 @@ /* vi: set sw=4 ts=4: */ /* - * Mini ps implementation for busybox + * Mini ps implementation(s) for busybox * - * - * Copyright (C) 1999 by Lineo, inc. + * Copyright (C) 1999,2000,2001 by Lineo, inc. * Written by Erik Andersen , * - * 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. + * 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. * - * 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 + * 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 "busybox.h" +#include +#include #include #include -#include +#include #include #include +#include +#include +#define BB_DECLARE_EXTERN +#define bb_need_help +#include "messages.c" -#if ! defined BB_FEATURE_USE_PROCFS -#error Sorry, I depend on the /proc filesystem right now. -#endif +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 @@ -76,24 +95,23 @@ static void parse_proc_status(char *S, proc_t * P) if (tmp) sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid); else - fprintf(stderr, "Internal error!\n"); + error_msg("Internal error!"); /* 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"); + error_msg("Internal error!"); tmp = strstr(S, "Gid:"); if (tmp) sscanf(tmp, "Gid:\t%d", &P->rgid); else - fprintf(stderr, "Internal error!\n"); + error_msg("Internal error!"); } - extern int ps_main(int argc, char **argv) { proc_t p; @@ -101,27 +119,30 @@ extern int ps_main(int argc, char **argv) FILE *file; struct dirent *entry; char path[32], sbuf[512]; - char uidName[10] = ""; - char groupName[10] = ""; - int i, c; + 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 + - 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); - } + if (!dir) + error_msg_and_die("Can't open /proc"); - fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", - "State", "Command"); - while ((entry = readdir(dir)) != NULL) { - uidName[0] = '\0'; - groupName[0] = '\0'; +#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); @@ -131,31 +152,130 @@ extern int ps_main(int argc, char **argv) /* Make some adjustments as needed */ my_getpwuid(uidName, p.ruid); - my_getgrgid(groupName, p.rgid); if (*uidName == '\0') sprintf(uidName, "%d", p.ruid); + my_getgrgid(groupName, p.rgid); 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); - } + if (file == NULL) + continue; i = 0; - while (((c = getc(file)) != EOF) && (i < 53)) { + 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) - fprintf(stdout, "%s", p.cmd); - fprintf(stdout, "\n"); + printf("[%s]", p.cmd); + putchar('\n'); } closedir(dir); - exit(TRUE); + 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]; + 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 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 */ +