procps/ps.c - fp2-dev/platform/external/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /*
  * Mini ps implementation(s) for busybox
  *
  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
  * Licensed under the GPL version 2, see the file LICENSE in this tarball.
  */

 #include "busybox.h"

 #if ENABLE_DESKTOP

 /* Print value to buf, max size+1 chars (including trailing '\0') */

 static void func_user(char *buf, int size, const procps_status_t *ps)
 {
 	safe_strncpy(buf, get_cached_username(ps->uid), size+1);
 }

 static void func_comm(char *buf, int size, const procps_status_t *ps)
 {
 	safe_strncpy(buf, ps->comm, size+1);
 }

 static void func_args(char *buf, int size, const procps_status_t *ps)
 {
 	buf[0] = '\0';
 	if (ps->cmd)
 		safe_strncpy(buf, ps->cmd, size+1);
 	else if (size >= 2)
 		snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
 }

 static void func_pid(char *buf, int size, const procps_status_t *ps)
 {
 	snprintf(buf, size+1, "%*u", size, ps->pid);
 }

 static void func_ppid(char *buf, int size, const procps_status_t *ps)
 {
 	snprintf(buf, size+1, "%*u", size, ps->ppid);
 }

 static void func_pgid(char *buf, int size, const procps_status_t *ps)
 {
 	snprintf(buf, size+1, "%*u", size, ps->pgid);
 }

 static void func_rss(char *buf, int size, const procps_status_t *ps)
 {
 	char buf5[5];
 	smart_ulltoa5( ((unsigned long long)ps->rss) << 10, buf5);
 	snprintf(buf, size+1, "%.*s", size, buf5);
 }

 /*
 void func_nice(char *buf, int size, const procps_status_t *ps)
 {
 	ps->???
 }

 void func_etime(char *buf, int size, const procps_status_t *ps)
 {
 	elapled time [[dd-]hh:]mm:ss
 }

 void func_time(char *buf, int size, const procps_status_t *ps)
 {
 	cumulative time [[dd-]hh:]mm:ss
 }

 void func_pcpu(char *buf, int size, const procps_status_t *ps)
 {
 }

 void func_tty(char *buf, int size, const procps_status_t *ps)
 {
 }
 */

 typedef struct {
 	char name[8];
 	const char *header;
 	void (*f)(char *buf, int size, const procps_status_t *ps);
 	int ps_flags;
 	int width;
 } ps_out_t;

 static const ps_out_t out_spec[] = {
 // Mandated by POSIX:
 	{ "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID,8                   },
 	{ "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM  ,16                  },
 	{ "args"  ,"COMMAND",func_args  ,PSSCAN_CMD|PSSCAN_COMM,256        },
 	{ "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID   ,5                   },
 	{ "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID  ,5                   },
 	{ "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID  ,5                   },
 //	{ "etime" ,"ELAPSED",func_etime ,PSSCAN_      ,sizeof("ELAPSED")-1 },
 //	{ "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID,sizeof("GROUP"  )-1 },
 //	{ "nice"  ,"NI"     ,func_nice  ,PSSCAN_      ,sizeof("NI"     )-1 },
 //	{ "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_      ,sizeof("%CPU"   )-1 },
 //	{ "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
 //	{ "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER"  )-1 },
 //	{ "time"  ,"TIME"   ,func_time  ,PSSCAN_      ,sizeof("TIME"   )-1 },
 //	{ "tty"   ,"TT"     ,func_tty   ,PSSCAN_      ,sizeof("TT"     )-1 },
 //	{ "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ   ,4                   },
 // Not mandated by POSIX:
 	{ "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS   ,4                   },
 };

 #define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )

 static ps_out_t* out;
 static int out_cnt;
 static int print_header;
 static int ps_flags;
 static char *buffer;
 static unsigned terminal_width;


 static ps_out_t* new_out_t(void)
 {
 	int i = out_cnt++;
 	out = xrealloc(out, out_cnt * sizeof(*out));
 	return &out[i];
 }

 static const ps_out_t* find_out_spec(const char *name)
 {
 	int i;
 	for (i = 0; i < VEC_SIZE(out_spec); i++) {
 		if (!strcmp(name, out_spec[i].name))
 			return &out_spec[i];
 	}
 	bb_error_msg_and_die("bad -o argument '%s'", name);
 }

 static void parse_o(char* opt)
 {
 	ps_out_t* new;
 	// POSIX: "-o is blank- or comma-separated list" (FIXME)
 	char *comma, *equal;
 	while (1) {
 		comma = strchr(opt, ',');
 		equal = strchr(opt, '=');
 		if (comma && (!equal || equal > comma)) {
 			*comma = '\0';
 			*new_out_t() = *find_out_spec(opt);
 			*comma = ',';
 			opt = comma + 1;
 			continue;
 		}
 		break;
 	}
 	new = new_out_t();
 	if (equal)
 		*equal = '\0';
 	*new = *find_out_spec(opt);
 	if (equal) {
 		*equal = '=';
 		new->header = equal + 1;
 		// POSIX: the field widths shall be ... at least as wide as
 		// the header text (default or overridden value).
 		// If the header text is null, such as -o user=,
 		// the field width shall be at least as wide as the
 		// default header text
 		if (new->header[0]) {
 			new->width = strlen(new->header);
 			print_header = 1;
 		}
 	} else
 		print_header = 1;
 }

 static void post_process(void)
 {
 	int i;
 	int width = 0;
 	for (i = 0; i < out_cnt; i++) {
 		ps_flags |= out[i].ps_flags;
 		if (out[i].header[0]) {
 			print_header = 1;
 		}
 		width += out[i].width + 1; /* "FIELD " */
 	}
 	buffer = xmalloc(width + 1); /* for trailing \0 */
 }

 static void format_header(void)
 {
 	int i;
 	ps_out_t* op;
 	char *p = buffer;
 	if (!print_header)
 		return;
 	i = 0;
 	if (out_cnt) {
 		while (1) {
 			op = &out[i];
 			if (++i == out_cnt) /* do not pad last field */
 				break;
 			p += sprintf(p, "%-*s ", op->width, op->header);
 		}
 		strcpy(p, op->header);
 	}
 	printf("%.*s\n", terminal_width, buffer);
 }

 static void format_process(const procps_status_t *ps)
 {
 	int i, len;
 	char *p = buffer;
 	i = 0;
 	if (out_cnt) while (1) {
 		out[i].f(p, out[i].width, ps);
 		// POSIX: Any field need not be meaningful in all
 		// implementations. In such a case a hyphen ( '-' )
 		// should be output in place of the field value.
 		if (!p[0]) {
 			p[0] = '-';
 			p[1] = '\0';
 		}
 		len = strlen(p);
 		p += len;
 		len = out[i].width - len + 1;
 		if (++i == out_cnt) /* do not pad last field */
 			break;
 		p += sprintf(p, "%*s", len, "");
 	}
 	printf("%.*s\n", terminal_width, buffer);
 }

 /* Cannot be const: parse_o() will choke */
 static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";

 int ps_main(int argc, char **argv)
 {
 	procps_status_t *p;
 	llist_t* opt_o = NULL;

 	// POSIX:
 	// -a  Write information for all processes associated with terminals
 	//     Implementations may omit session leaders from this list
 	// -A  Write information for all processes
 	// -d  Write information for all processes, except session leaders
 	// -e  Write information for all processes (equivalent to -A.)
 	// -f  Generate a full listing
 	// -l  Generate a long listing
 	// -o col1,col2,col3=header
 	//     Select which columns to distplay
 	/* We allow (and ignore) most of the above. FIXME */
 	opt_complementary = "o::";
 	getopt32(argc, argv, "o:aAdefl", &opt_o);
 	if (opt_o) {
 		opt_o = rev_llist(opt_o);
 		do {
 			parse_o(opt_o->data);
 			opt_o = opt_o->link;
 		} while (opt_o);
 	} else
 		parse_o(default_o);
 	post_process();

 	terminal_width = INT_MAX;
 	if (isatty(1)) {
 		get_terminal_width_height(1, &terminal_width, NULL);
 		terminal_width--;
 	}
 	format_header();

 	p = NULL;
 	while ((p = procps_scan(p, ps_flags))) {
 		format_process(p);
 	}

 	return EXIT_SUCCESS;
 }


 #else /* !ENABLE_DESKTOP */


 int ps_main(int argc, char **argv)
 {
 	procps_status_t *p = NULL;
 	int i, len;
 	SKIP_SELINUX(const) int use_selinux = 0;
 	USE_SELINUX(security_context_t sid = NULL;)
 #if !ENABLE_FEATURE_PS_WIDE
 	enum { terminal_width = 79 };
 #else
 	int terminal_width;
 	int w_count = 0;
 #endif

 #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
 #if ENABLE_FEATURE_PS_WIDE
 	opt_complementary = "-:ww";
 	USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("c") "w", &w_count);
 	/* if w is given once, GNU ps sets the width to 132,
 	 * if w is given more than once, it is "unlimited"
 	 */
 	if (w_count) {
 		terminal_width = (w_count==1) ? 132 : INT_MAX;
 	} else {
 		get_terminal_width_height(1, &terminal_width, NULL);
 		/* Go one less... */
 		terminal_width--;
 	}
 #else /* only ENABLE_SELINUX */
 	i = getopt32(argc, argv, "c");
 #endif
 #if ENABLE_SELINUX
 	if ((i & 1) && is_selinux_enabled())
 		use_selinux = 1;
 #endif
 #endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */

 	if (use_selinux)
 		puts("  PID Context                          Stat Command");
 	else
 		puts("  PID  Uid     VmSize Stat Command");

 	while ((p = procps_scan(p, 0
 			| PSSCAN_PID
 			| PSSCAN_UIDGID
 			| PSSCAN_STATE
 			| PSSCAN_RSS
 			| PSSCAN_CMD
 	))) {
 		char *namecmd = p->cmd;
 #if ENABLE_SELINUX
 		if (use_selinux) {
 			char sbuf[128];
 			len = sizeof(sbuf);

 			if (is_selinux_enabled()) {
 				if (getpidcon(p->pid, &sid) < 0)
 					sid = NULL;
 			}

 			if (sid) {
 				/* I assume sid initialized with NULL */
 				len = strlen(sid) + 1;
 				safe_strncpy(sbuf, sid, len);
 				freecon(sid);
 				sid = NULL;
 			} else {
 				safe_strncpy(sbuf, "unknown", 7);
 			}
 			len = printf("%5u %-32s %s ", p->pid, sbuf, p->state);
 		} else
 #endif
 		{
 			const char *user = get_cached_username(p->uid);
 			if (p->rss == 0)
 				len = printf("%5u %-8s        %s ",
 					p->pid, user, p->state);
 			else
 				len = printf("%5u %-8s %6ld %s ",
 					p->pid, user, p->rss, p->state);
 		}

 		i = terminal_width-len;

 		if (namecmd && namecmd[0]) {
 			if (i < 0)
 				i = 0;
 			if (strlen(namecmd) > (size_t)i)
 				namecmd[i] = 0;
 			puts(namecmd);
 		} else {
 			namecmd = p->comm;
 			if (i < 2)
 				i = 2;
 			if (strlen(namecmd) > ((size_t)i-2))
 				namecmd[i-2] = 0;
 			printf("[%s]\n", namecmd);
 		}
 	}
 	if (ENABLE_FEATURE_CLEAN_UP)
 		clear_username_cache();
 	return EXIT_SUCCESS;
 }

 #endif /* ENABLE_DESKTOP */
	/* vi: set sw=4 ts=4: */
	/*
	* Mini ps implementation(s) for busybox
	*
	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
	*
	* Licensed under the GPL version 2, see the file LICENSE in this tarball.
	*/

	#include "busybox.h"

	#if ENABLE_DESKTOP

	/* Print value to buf, max size+1 chars (including trailing '\0') */

	static void func_user(char buf, int size, const procps_status_t ps)
	{
	safe_strncpy(buf, get_cached_username(ps->uid), size+1);
	}

	static void func_comm(char buf, int size, const procps_status_t ps)
	{
	safe_strncpy(buf, ps->comm, size+1);
	}

	static void func_args(char buf, int size, const procps_status_t ps)
	{
	buf[0] = '\0';
	if (ps->cmd)
	safe_strncpy(buf, ps->cmd, size+1);
	else if (size >= 2)
	snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
	}

	static void func_pid(char buf, int size, const procps_status_t ps)
	{
	snprintf(buf, size+1, "%*u", size, ps->pid);
	}

	static void func_ppid(char buf, int size, const procps_status_t ps)
	{
	snprintf(buf, size+1, "%*u", size, ps->ppid);
	}

	static void func_pgid(char buf, int size, const procps_status_t ps)
	{
	snprintf(buf, size+1, "%*u", size, ps->pgid);
	}

	static void func_rss(char buf, int size, const procps_status_t ps)
	{
	char buf5[5];
	smart_ulltoa5( ((unsigned long long)ps->rss) << 10, buf5);
	snprintf(buf, size+1, "%.*s", size, buf5);
	}

	/*
	void func_nice(char buf, int size, const procps_status_t ps)
	{
	ps->???
	}

	void func_etime(char buf, int size, const procps_status_t ps)
	{
	elapled time [[dd-]hh:]mm:ss
	}

	void func_time(char buf, int size, const procps_status_t ps)
	{
	cumulative time [[dd-]hh:]mm:ss
	}

	void func_pcpu(char buf, int size, const procps_status_t ps)
	{
	}

	void func_tty(char buf, int size, const procps_status_t ps)
	{
	}
	*/

	typedef struct {
	char name[8];
	const char *header;
	void (f)(char buf, int size, const procps_status_t *ps);
	int ps_flags;
	int width;
	} ps_out_t;

	static const ps_out_t out_spec[] = {
	// Mandated by POSIX:
	{ "user" ,"USER" ,func_user ,PSSCAN_UIDGID,8 },
	{ "comm" ,"COMMAND",func_comm ,PSSCAN_COMM ,16 },
	{ "args" ,"COMMAND",func_args ,PSSCAN_CMD\|PSSCAN_COMM,256 },
	{ "pid" ,"PID" ,func_pid ,PSSCAN_PID ,5 },
	{ "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID ,5 },
	{ "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID ,5 },
	// { "etime" ,"ELAPSED",func_etime ,PSSCAN_ ,sizeof("ELAPSED")-1 },
	// { "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID,sizeof("GROUP" )-1 },
	// { "nice" ,"NI" ,func_nice ,PSSCAN_ ,sizeof("NI" )-1 },
	// { "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ ,sizeof("%CPU" )-1 },
	// { "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
	// { "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER" )-1 },
	// { "time" ,"TIME" ,func_time ,PSSCAN_ ,sizeof("TIME" )-1 },
	// { "tty" ,"TT" ,func_tty ,PSSCAN_ ,sizeof("TT" )-1 },
	// { "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ ,4 },
	// Not mandated by POSIX:
	{ "rss" ,"RSS" ,func_rss ,PSSCAN_RSS ,4 },
	};

	#define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )

	static ps_out_t* out;
	static int out_cnt;
	static int print_header;
	static int ps_flags;
	static char *buffer;
	static unsigned terminal_width;


	static ps_out_t* new_out_t(void)
	{
	int i = out_cnt++;
	out = xrealloc(out, out_cnt * sizeof(*out));
	return &out[i];
	}

	static const ps_out_t* find_out_spec(const char *name)
	{
	int i;
	for (i = 0; i < VEC_SIZE(out_spec); i++) {
	if (!strcmp(name, out_spec[i].name))
	return &out_spec[i];
	}
	bb_error_msg_and_die("bad -o argument '%s'", name);
	}

	static void parse_o(char* opt)
	{
	ps_out_t* new;
	// POSIX: "-o is blank- or comma-separated list" (FIXME)
	char comma, equal;
	while (1) {
	comma = strchr(opt, ',');
	equal = strchr(opt, '=');
	if (comma && (!equal \|\| equal > comma)) {
	*comma = '\0';
	new_out_t() = find_out_spec(opt);
	*comma = ',';
	opt = comma + 1;
	continue;
	}
	break;
	}
	new = new_out_t();
	if (equal)
	*equal = '\0';
	new = find_out_spec(opt);
	if (equal) {
	*equal = '=';
	new->header = equal + 1;
	// POSIX: the field widths shall be ... at least as wide as
	// the header text (default or overridden value).
	// If the header text is null, such as -o user=,
	// the field width shall be at least as wide as the
	// default header text
	if (new->header[0]) {
	new->width = strlen(new->header);
	print_header = 1;
	}
	} else
	print_header = 1;
	}

	static void post_process(void)
	{
	int i;
	int width = 0;
	for (i = 0; i < out_cnt; i++) {
	ps_flags \|= out[i].ps_flags;
	if (out[i].header[0]) {
	print_header = 1;
	}
	width += out[i].width + 1; /* "FIELD " */
	}
	buffer = xmalloc(width + 1); /* for trailing \0 */
	}

	static void format_header(void)
	{
	int i;
	ps_out_t* op;
	char *p = buffer;
	if (!print_header)
	return;
	i = 0;
	if (out_cnt) {
	while (1) {
	op = &out[i];
	if (++i == out_cnt) /* do not pad last field */
	break;
	p += sprintf(p, "%-*s ", op->width, op->header);
	}
	strcpy(p, op->header);
	}
	printf("%.*s\n", terminal_width, buffer);
	}

	static void format_process(const procps_status_t *ps)
	{
	int i, len;
	char *p = buffer;
	i = 0;
	if (out_cnt) while (1) {
	out[i].f(p, out[i].width, ps);
	// POSIX: Any field need not be meaningful in all
	// implementations. In such a case a hyphen ( '-' )
	// should be output in place of the field value.
	if (!p[0]) {
	p[0] = '-';
	p[1] = '\0';
	}
	len = strlen(p);
	p += len;
	len = out[i].width - len + 1;
	if (++i == out_cnt) /* do not pad last field */
	break;
	p += sprintf(p, "%*s", len, "");
	}
	printf("%.*s\n", terminal_width, buffer);
	}

	/* Cannot be const: parse_o() will choke */
	static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";

	int ps_main(int argc, char **argv)
	{
	procps_status_t *p;
	llist_t* opt_o = NULL;

	// POSIX:
	// -a Write information for all processes associated with terminals
	// Implementations may omit session leaders from this list
	// -A Write information for all processes
	// -d Write information for all processes, except session leaders
	// -e Write information for all processes (equivalent to -A.)
	// -f Generate a full listing
	// -l Generate a long listing
	// -o col1,col2,col3=header
	// Select which columns to distplay
	/* We allow (and ignore) most of the above. FIXME */
	opt_complementary = "o::";
	getopt32(argc, argv, "o:aAdefl", &opt_o);
	if (opt_o) {
	opt_o = rev_llist(opt_o);
	do {
	parse_o(opt_o->data);
	opt_o = opt_o->link;
	} while (opt_o);
	} else
	parse_o(default_o);
	post_process();

	terminal_width = INT_MAX;
	if (isatty(1)) {
	get_terminal_width_height(1, &terminal_width, NULL);
	terminal_width--;
	}
	format_header();

	p = NULL;
	while ((p = procps_scan(p, ps_flags))) {
	format_process(p);
	}

	return EXIT_SUCCESS;
	}


	#else /* !ENABLE_DESKTOP */


	int ps_main(int argc, char **argv)
	{
	procps_status_t *p = NULL;
	int i, len;
	SKIP_SELINUX(const) int use_selinux = 0;
	USE_SELINUX(security_context_t sid = NULL;)
	#if !ENABLE_FEATURE_PS_WIDE
	enum { terminal_width = 79 };
	#else
	int terminal_width;
	int w_count = 0;
	#endif

	#if ENABLE_FEATURE_PS_WIDE \|\| ENABLE_SELINUX
	#if ENABLE_FEATURE_PS_WIDE
	opt_complementary = "-:ww";
	USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("c") "w", &w_count);
	/* if w is given once, GNU ps sets the width to 132,
	* if w is given more than once, it is "unlimited"
	*/
	if (w_count) {
	terminal_width = (w_count==1) ? 132 : INT_MAX;
	} else {
	get_terminal_width_height(1, &terminal_width, NULL);
	/* Go one less... */
	terminal_width--;
	}
	#else /* only ENABLE_SELINUX */
	i = getopt32(argc, argv, "c");
	#endif
	#if ENABLE_SELINUX
	if ((i & 1) && is_selinux_enabled())
	use_selinux = 1;
	#endif
	#endif /* ENABLE_FEATURE_PS_WIDE \|\| ENABLE_SELINUX */

	if (use_selinux)
	puts(" PID Context Stat Command");
	else
	puts(" PID Uid VmSize Stat Command");

	while ((p = procps_scan(p, 0
	\| PSSCAN_PID
	\| PSSCAN_UIDGID
	\| PSSCAN_STATE
	\| PSSCAN_RSS
	\| PSSCAN_CMD
	))) {
	char *namecmd = p->cmd;
	#if ENABLE_SELINUX
	if (use_selinux) {
	char sbuf[128];
	len = sizeof(sbuf);

	if (is_selinux_enabled()) {
	if (getpidcon(p->pid, &sid) < 0)
	sid = NULL;
	}

	if (sid) {
	/* I assume sid initialized with NULL */
	len = strlen(sid) + 1;
	safe_strncpy(sbuf, sid, len);
	freecon(sid);
	sid = NULL;
	} else {
	safe_strncpy(sbuf, "unknown", 7);
	}
	len = printf("%5u %-32s %s ", p->pid, sbuf, p->state);
	} else
	#endif
	{
	const char *user = get_cached_username(p->uid);
	if (p->rss == 0)
	len = printf("%5u %-8s %s ",
	p->pid, user, p->state);
	else
	len = printf("%5u %-8s %6ld %s ",
	p->pid, user, p->rss, p->state);
	}

	i = terminal_width-len;

	if (namecmd && namecmd[0]) {
	if (i < 0)
	i = 0;
	if (strlen(namecmd) > (size_t)i)
	namecmd[i] = 0;
	puts(namecmd);
	} else {
	namecmd = p->comm;
	if (i < 2)
	i = 2;
	if (strlen(namecmd) > ((size_t)i-2))
	namecmd[i-2] = 0;
	printf("[%s]\n", namecmd);
	}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
	clear_username_cache();
	return EXIT_SUCCESS;
	}

	#endif /* ENABLE_DESKTOP */