ps.c - codeaurora/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /*
  * Mini ps implementation(s) for busybox
  *
  * Copyright (C) 1999,2000 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 "busybox.h"
 #include <stdio.h>
 #include <unistd.h>
 #include <dirent.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) */
 } 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!\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[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\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");
 	}
 	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);
 		}
 	}

 	/* 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 */
	/* vi: set sw=4 ts=4: */
	/*
	* Mini ps implementation(s) for busybox
	*
	* Copyright (C) 1999,2000 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 "busybox.h"
	#include <stdio.h>
	#include <unistd.h>
	#include <dirent.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) */
	} 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!\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[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\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");
	}
	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);
	}
	}

	/* 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 */