+/* vi: set sw=4 ts=4: */
/*
- * Mini ps implementation for busybox
+ * Mini ps implementation(s) for busybox
*
+ * Copyright (C) 1999,2000 by Lineo, inc. Written by Erik Andersen
+ * <andersen@lineo.com>, <andersee@debian.org>
*
- * Copyright (C) 1999 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
- * 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 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 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
+ *
+ * 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 "internal.h"
+#include "busybox.h"
+#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
-#include <stdio.h>
+#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
+#include <sys/ioctl.h>
+#define BB_DECLARE_EXTERN
+#define bb_need_help
+#include "messages.c"
+
+#define 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.
+ */
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
+#endif
+
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) */
+ 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)
+static int file2str(char *filename, char *ret, int cap)
{
- int fd, num_read;
+ 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;
+ 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)
+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 fprintf(stderr, "Internal error!\n");
-
- /* For busybox, ignoring effecting, saved, etc */
- tmp = strstr (S,"Uid:");
- if(tmp) sscanf (tmp,
- "Uid:\t%d", &P->ruid);
- else fprintf(stderr, "Internal error!\n");
-
- tmp = strstr (S,"Gid:");
- if(tmp) sscanf (tmp,
- "Gid:\t%d", &P->rgid);
- else fprintf(stderr, "Internal error!\n");
+ 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!\n");
+
+ /* For busybox, ignoring effective, saved, etc */
+ tmp = strstr(S, "Uid:");
+ if (tmp)
+ sscanf(tmp, "Uid:\t%d", &P->ruid);
+ else
+ error_msg("Internal error!\n");
+
+ tmp = strstr(S, "Gid:");
+ if (tmp)
+ sscanf(tmp, "Gid:\t%d", &P->rgid);
+ else
+ error_msg("Internal error!\n");
+
+}
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[10]="";
- char groupName[10]="";
- int i, c;
-
- if ( argc>1 && **(argv+1) == '-' ) {
- usage ("ps - report process status\nThis version of ps accepts no options.\n");
- }
-
- dir = opendir("/proc");
- if (!dir) {
- perror("Can't open /proc");
- exit(FALSE);
- }
-
- fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
- while ((entry = readdir(dir)) != NULL) {
- uidName[0]='\0';
- groupName[0]='\0';
-
- 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);
- }
+ 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
+
- /* Make some adjustments as needed */
- my_getpwuid( uidName, p.ruid);
- my_getgrgid( groupName, p.rgid);
- if (*uidName == '\0')
- sprintf( uidName, "%d", p.ruid);
- 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);
+
+ dir = opendir("/proc");
+ if (!dir)
+ error_msg_and_die("Can't open /proc\n");
+
+#ifdef BB_FEATURE_AUTOWIDTH
+ ioctl(fileno(stdout), TIOCGWINSZ, &win);
+ if (win.ws_col > 0)
+ terminal_width = win.ws_col - 1;
+#endif
+
+ fprintf(stdout, "%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 = fprintf(stdout, "%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");
}
- i=0;
- while (((c = getc(file)) != EOF) && (i < 53)) {
- i++;
- if (c == '\0')
- c = ' ';
- putc(c, stdout);
+ 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) == '-')
+ usage(ps_usage);
+
+ /* open device */
+ fd = open(device, O_RDONLY);
+ if (fd < 0)
+ error_msg_and_die( "open failed for `%s': %s\n", device, strerror (errno));
+
+ /* Find out how many processes there are */
+ if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
+ error_msg_and_die( "\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
+
+ /* 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)
+ error_msg_and_die("\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
+
+#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 */
+ fprintf(stdout, "%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)
+ error_msg_and_die("\nDEVPS_GET_PID_INFO: %s\n", strerror (errno));
+
+ /* 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 = fprintf(stdout, "%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';
+ fprintf(stdout, "%s\n", info.command_line);
+ } else {
+ fprintf(stdout, "[%s]\n", info.name);
+ }
}
- if (i==0)
- fprintf(stdout, "%s", p.cmd);
- fprintf(stdout, "\n");
- }
- closedir(dir);
- exit(TRUE);
+
+ /* Free memory */
+ free( pid_array);
+
+ /* close device */
+ if (close (fd) != 0)
+ error_msg_and_die("close failed for `%s': %s\n", device, strerror (errno));
+
+ exit (0);
}
+
+#endif /* BB_FEATURE_USE_DEVPS_PATCH */
+
projects / oweals / busybox.git / blobdiff