busybox/procps/ps.c

/* vi: set sw=4 ts=4: */
/*
 * Mini ps implementation(s) for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
 *                         (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
 *
 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
 */

#include "libbb.h"

/* Absolute maximum on output line length */
enum { MAX_WIDTH = 2*1024 };

#if ENABLE_DESKTOP

#include <sys/sysinfo.h>
#include <sys/times.h> /* for times() */
#ifndef AT_CLKTCK
#define AT_CLKTCK 17
#endif


#if ENABLE_SELINUX
#define SELINUX_O_PREFIX "label,"
#define DEFAULT_O_STR    (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
#else
#define DEFAULT_O_STR    ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
#endif

typedef struct {
	uint16_t width;
	char name6[6];
	const char *header;
	void (*f)(char *buf, int size, const procps_status_t *ps);
	int ps_flags;
} ps_out_t;

struct globals {
	ps_out_t* out;
	int out_cnt;
	int print_header;
	int need_flags;
	char *buffer;
	unsigned terminal_width;
#if ENABLE_FEATURE_PS_TIME
	unsigned kernel_HZ;
	unsigned long long seconds_since_boot;
#endif
	char default_o[sizeof(DEFAULT_O_STR)];
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define out                (G.out               )
#define out_cnt            (G.out_cnt           )
#define print_header       (G.print_header      )
#define need_flags         (G.need_flags        )
#define buffer             (G.buffer            )
#define terminal_width     (G.terminal_width    )
#define kernel_HZ          (G.kernel_HZ         )
#define seconds_since_boot (G.seconds_since_boot)
#define default_o          (G.default_o         )
#define INIT_G() do { } while (0)

#if ENABLE_FEATURE_PS_TIME
/* for ELF executables, notes are pushed before environment and args */
static ptrdiff_t find_elf_note(ptrdiff_t findme)
{
	ptrdiff_t *ep = (ptrdiff_t *) environ;

	while (*ep++);
	while (*ep) {
		if (ep[0] == findme) {
			return ep[1];
		}
		ep += 2;
	}
	return -1;
}

#if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
static unsigned get_HZ_by_waiting(void)
{
	struct timeval tv1, tv2;
	unsigned t1, t2, r, hz;
	unsigned cnt = cnt; /* for compiler */
	int diff;

	r = 0;

	/* Wait for times() to reach new tick */
	t1 = times(NULL);
	do {
		t2 = times(NULL);
	} while (t2 == t1);
	gettimeofday(&tv2, NULL);

	do {
		t1 = t2;
		tv1.tv_usec = tv2.tv_usec;

		/* Wait exactly one times() tick */
		do {
			t2 = times(NULL);
		} while (t2 == t1);
		gettimeofday(&tv2, NULL);

		/* Calculate ticks per sec, rounding up to even */
		diff = tv2.tv_usec - tv1.tv_usec;
		if (diff <= 0) diff += 1000000;
		hz = 1000000u / (unsigned)diff;
		hz = (hz+1) & ~1;

		/* Count how many same hz values we saw */
		if (r != hz) {
			r = hz;
			cnt = 0;
		}
		cnt++;
	} while (cnt < 3); /* exit if saw 3 same values */

	return r;
}
#else
static inline unsigned get_HZ_by_waiting(void)
{
	/* Better method? */
	return 100;
}
#endif

static unsigned get_kernel_HZ(void)
{
	//char buf[64];
	struct sysinfo info;

	if (kernel_HZ)
		return kernel_HZ;

	/* Works for ELF only, Linux 2.4.0+ */
	kernel_HZ = find_elf_note(AT_CLKTCK);
	if (kernel_HZ == (unsigned)-1)
		kernel_HZ = get_HZ_by_waiting();

	//if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
	//	bb_perror_msg_and_die("can't read %s", "/proc/uptime");
	//buf[sizeof(buf)-1] = '\0';
	///sscanf(buf, "%llu", &seconds_since_boot);
	sysinfo(&info);
	seconds_since_boot = info.uptime;

	return kernel_HZ;
}
#endif

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

static void func_user(char *buf, int size, const procps_status_t *ps)
{
#if 1
	safe_strncpy(buf, get_cached_username(ps->uid), size+1);
#else
	/* "compatible" version, but it's larger */
	/* procps 2.18 shows numeric UID if name overflows the field */
	/* TODO: get_cached_username() returns numeric string if
	 * user has no passwd record, we will display it
	 * left-justified here; too long usernames are shown
	 * as _right-justified_ IDs. Is it worth fixing? */
	const char *user = get_cached_username(ps->uid);
	if (strlen(user) <= size)
		safe_strncpy(buf, user, size+1);
	else
		sprintf(buf, "%*u", size, (unsigned)ps->uid);
#endif
}

static void func_group(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, get_cached_groupname(ps->gid), 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)
{
	read_cmdline(buf, size+1, ps->pid, ps->comm);
}

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

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

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

static void put_lu(char *buf, int size, unsigned long u)
{
	char buf4[5];

	/* see http://en.wikipedia.org/wiki/Tera */
	smart_ulltoa4(u, buf4, " mgtpezy");
	buf4[4] = '\0';
	sprintf(buf, "%.*s", size, buf4);
}

static void func_vsz(char *buf, int size, const procps_status_t *ps)
{
	put_lu(buf, size, ps->vsz);
}

static void func_rss(char *buf, int size, const procps_status_t *ps)
{
	put_lu(buf, size, ps->rss);
}

static void func_tty(char *buf, int size, const procps_status_t *ps)
{
	buf[0] = '?';
	buf[1] = '\0';
	if (ps->tty_major) /* tty field of "0" means "no tty" */
		snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
}

#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS

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

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

static void func_nice(char *buf, int size, const procps_status_t *ps)
{
	sprintf(buf, "%*d", size, ps->niceness);
}

#endif

#if ENABLE_FEATURE_PS_TIME

static void func_etime(char *buf, int size, const procps_status_t *ps)
{
	/* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
	unsigned long mm;
	unsigned ss;

	mm = ps->start_time / get_kernel_HZ();
	/* must be after get_kernel_HZ()! */
	mm = seconds_since_boot - mm;
	ss = mm % 60;
	mm /= 60;
	snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}

static void func_time(char *buf, int size, const procps_status_t *ps)
{
	/* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
	unsigned long mm;
	unsigned ss;

	mm = (ps->utime + ps->stime) / get_kernel_HZ();
	ss = mm % 60;
	mm /= 60;
	snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}

#endif

#if ENABLE_SELINUX
static void func_label(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
}
#endif

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

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

static const ps_out_t out_spec[] = {
// Mandated by POSIX:
	{ 8                  , "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID  },
	{ 8                  , "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID  },
	{ 16                 , "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM    },
	{ MAX_WIDTH          , "args"  ,"COMMAND",func_args  ,PSSCAN_COMM    },
	{ 5                  , "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID     },
	{ 5                  , "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID    },
	{ 5                  , "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID    },
#if ENABLE_FEATURE_PS_TIME
	{ sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
#endif
#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
	{ 5                  , "nice"  ,"NI"     ,func_nice  ,PSSCAN_NICE    },
	{ 8                  , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
	{ 8                  , "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_RUIDGID },
//	{ 5                  , "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_        },
#endif
#if ENABLE_FEATURE_PS_TIME
	{ 6                  , "time"  ,"TIME"   ,func_time  ,PSSCAN_STIME | PSSCAN_UTIME },
#endif
	{ 6                  , "tty"   ,"TT"     ,func_tty   ,PSSCAN_TTY     },
	{ 4                  , "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ     },
// Not mandated by POSIX, but useful:
	{ 4                  , "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS     },
#if ENABLE_SELINUX
	{ 35                 , "label" ,"LABEL"  ,func_label ,PSSCAN_CONTEXT },
#endif
};

static ps_out_t* new_out_t(void)
{
	out = xrealloc_vector(out, 2, out_cnt);
	return &out[out_cnt++];
}

static const ps_out_t* find_out_spec(const char *name)
{
	unsigned i;
#if ENABLE_DESKTOP
	char buf[ARRAY_SIZE(out_spec)*7 + 1];
	char *p = buf;
#endif

	for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
		if (strncmp(name, out_spec[i].name6, 6) == 0)
			return &out_spec[i];
#if ENABLE_DESKTOP
		p += sprintf(p, "%.6s,", out_spec[i].name6);
#endif
	}
#if ENABLE_DESKTOP
	p[-1] = '\0';
	bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
#else
	bb_error_msg_and_die("bad -o argument '%s'");
#endif
}

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;
	}
	// opt points to last spec in comma separated list.
	// This one can have =HEADER part.
	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 alloc_line_buffer(void)
{
	int i;
	int width = 0;
	for (i = 0; i < out_cnt; i++) {
		need_flags |= out[i].ps_flags;
		if (out[i].header[0]) {
			print_header = 1;
		}
		width += out[i].width + 1; /* "FIELD " */
		if ((int)(width - terminal_width) > 0) {
			/* The rest does not fit on the screen */
			//out[i].width -= (width - terminal_width - 1);
			out_cnt = i + 1;
			break;
		}
	}
#if ENABLE_SELINUX
	if (!is_selinux_enabled())
		need_flags &= ~PSSCAN_CONTEXT;
#endif
	buffer = xmalloc(width + 1); /* for trailing \0 */
}

static void format_header(void)
{
	int i;
	ps_out_t* op;
	char *p;

	if (!print_header)
		return;
	p = buffer;
	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);
}

int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ps_main(int argc UNUSED_PARAM, char **argv)
{
	procps_status_t *p;
	llist_t* opt_o = NULL;
	int opt;
	enum {
		OPT_Z = (1 << 0),
		OPT_o = (1 << 1),
		OPT_a = (1 << 2),
		OPT_A = (1 << 3),
		OPT_d = (1 << 4),
		OPT_e = (1 << 5),
		OPT_f = (1 << 6),
		OPT_l = (1 << 7),
		OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
	};

	INIT_G();

	// 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 display
	/* We allow (and ignore) most of the above. FIXME.
	 * -T is picked for threads (POSIX hasn't it standardized).
	 * procps v3.2.7 supports -T and shows tids as SPID column,
	 * it also supports -L where it shows tids as LWP column.
	 */
	opt_complementary = "o::";
	opt = getopt32(argv, "Zo:aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);
	if (opt_o) {
		do {
			parse_o(llist_pop(&opt_o));
		} while (opt_o);
	} else {
		/* Below: parse_o() needs char*, NOT const char*... */
#if ENABLE_SELINUX
		if (!(opt & OPT_Z) || !is_selinux_enabled()) {
			/* no -Z or no SELinux: do not show LABEL */
			strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
		} else
#endif
		{
			strcpy(default_o, DEFAULT_O_STR);
		}
		parse_o(default_o);
	}
#if ENABLE_FEATURE_SHOW_THREADS
	if (opt & OPT_T)
		need_flags |= PSSCAN_TASKS;
#endif

	/* Was INT_MAX, but some libc's go belly up with printf("%.*s")
	 * and such large widths */
	terminal_width = MAX_WIDTH;
	if (isatty(1)) {
		get_terminal_width_height(0, &terminal_width, NULL);
		if (--terminal_width > MAX_WIDTH)
			terminal_width = MAX_WIDTH;
	}
	alloc_line_buffer();
	format_header();

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

	return EXIT_SUCCESS;
}


#else /* !ENABLE_DESKTOP */


int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
	procps_status_t *p;
	int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
			| PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
	unsigned terminal_width IF_NOT_FEATURE_PS_WIDE(= 79);
	enum {
		OPT_Z = (1 << 0) * ENABLE_SELINUX,
		OPT_T = (1 << ENABLE_SELINUX) * ENABLE_FEATURE_SHOW_THREADS,
	};
	int opts = 0;
	/* If we support any options, parse argv */
#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE
# if ENABLE_FEATURE_PS_WIDE
	/* -w is a bit complicated */
	int w_count = 0;
	opt_complementary = "-:ww";
	opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")"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 : MAX_WIDTH;
	} else {
		get_terminal_width_height(0, &terminal_width, NULL);
		/* Go one less... */
		if (--terminal_width > MAX_WIDTH)
			terminal_width = MAX_WIDTH;
	}
# else
	/* -w is not supported, only -Z and/or -T */
	opt_complementary = "-";
	opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T"));
# endif
#endif

#if ENABLE_SELINUX
	if ((opts & OPT_Z) && is_selinux_enabled()) {
		psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
				| PSSCAN_STATE | PSSCAN_COMM;
		puts("  PID CONTEXT                          STAT COMMAND");
	} else
#endif
	{
		puts("  PID USER       VSZ STAT COMMAND");
	}
	if (opts & OPT_T) {
		psscan_flags |= PSSCAN_TASKS;
	}

	p = NULL;
	while ((p = procps_scan(p, psscan_flags)) != NULL) {
		int len;
#if ENABLE_SELINUX
		if (psscan_flags & PSSCAN_CONTEXT) {
			len = printf("%5u %-32.32s %s  ",
					p->pid,
					p->context ? p->context : "unknown",
					p->state);
		} else
#endif
		{
			const char *user = get_cached_username(p->uid);
			//if (p->vsz == 0)
			//	len = printf("%5u %-8.8s        %s ",
			//		p->pid, user, p->state);
			//else
			{
				char buf6[6];
				smart_ulltoa5(p->vsz, buf6, " mgtpezy");
				buf6[5] = '\0';
				len = printf("%5u %-8.8s %s %s  ",
					p->pid, user, buf6, p->state);
			}
		}

		{
			int sz = terminal_width - len;
			char buf[sz + 1];
			read_cmdline(buf, sz, p->pid, p->comm);
			puts(buf);
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		clear_username_cache();
	return EXIT_SUCCESS;
}

#endif /* !ENABLE_DESKTOP */
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini ps implementation(s) for busybox
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	* Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
7	* (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
8	*
9	* Licensed under the GPL version 2, see the file LICENSE in this tarball.
10	*/
11
12	#include "libbb.h"
13
14	/* Absolute maximum on output line length */
15	enum { MAX_WIDTH = 2*1024 };
16
17	#if ENABLE_DESKTOP
18
19	#include <sys/sysinfo.h>
20	#include <sys/times.h> /* for times() */
21	#ifndef AT_CLKTCK
22	#define AT_CLKTCK 17
23	#endif
24
25
26	#if ENABLE_SELINUX
27	#define SELINUX_O_PREFIX "label,"
28	#define DEFAULT_O_STR (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
29	#else
30	#define DEFAULT_O_STR ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
31	#endif
32
33	typedef struct {
34	uint16_t width;
35	char name6[6];
36	const char *header;
37	void (f)(char buf, int size, const procps_status_t *ps);
38	int ps_flags;
39	} ps_out_t;
40
41	struct globals {
42	ps_out_t* out;
43	int out_cnt;
44	int print_header;
45	int need_flags;
46	char *buffer;
47	unsigned terminal_width;
48	#if ENABLE_FEATURE_PS_TIME
49	unsigned kernel_HZ;
50	unsigned long long seconds_since_boot;
51	#endif
52	char default_o[sizeof(DEFAULT_O_STR)];
53	} FIX_ALIASING;
54	#define G ((struct globals)&bb_common_bufsiz1)
55	#define out (G.out )
56	#define out_cnt (G.out_cnt )
57	#define print_header (G.print_header )
58	#define need_flags (G.need_flags )
59	#define buffer (G.buffer )
60	#define terminal_width (G.terminal_width )
61	#define kernel_HZ (G.kernel_HZ )
62	#define seconds_since_boot (G.seconds_since_boot)
63	#define default_o (G.default_o )
64	#define INIT_G() do { } while (0)
65
66	#if ENABLE_FEATURE_PS_TIME
67	/* for ELF executables, notes are pushed before environment and args */
68	static ptrdiff_t find_elf_note(ptrdiff_t findme)
69	{
70	ptrdiff_t ep = (ptrdiff_t ) environ;
71
72	while (*ep++);
73	while (*ep) {
74	if (ep[0] == findme) {
75	return ep[1];
76	}
77	ep += 2;
78	}
79	return -1;
80	}
81
82	#if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
83	static unsigned get_HZ_by_waiting(void)
84	{
85	struct timeval tv1, tv2;
86	unsigned t1, t2, r, hz;
87	unsigned cnt = cnt; /* for compiler */
88	int diff;
89
90	r = 0;
91
92	/* Wait for times() to reach new tick */
93	t1 = times(NULL);
94	do {
95	t2 = times(NULL);
96	} while (t2 == t1);
97	gettimeofday(&tv2, NULL);
98
99	do {
100	t1 = t2;
101	tv1.tv_usec = tv2.tv_usec;
102
103	/* Wait exactly one times() tick */
104	do {
105	t2 = times(NULL);
106	} while (t2 == t1);
107	gettimeofday(&tv2, NULL);
108
109	/* Calculate ticks per sec, rounding up to even */
110	diff = tv2.tv_usec - tv1.tv_usec;
111	if (diff <= 0) diff += 1000000;
112	hz = 1000000u / (unsigned)diff;
113	hz = (hz+1) & ~1;
114
115	/* Count how many same hz values we saw */
116	if (r != hz) {
117	r = hz;
118	cnt = 0;
119	}
120	cnt++;
121	} while (cnt < 3); /* exit if saw 3 same values */
122
123	return r;
124	}
125	#else
126	static inline unsigned get_HZ_by_waiting(void)
127	{
128	/* Better method? */
129	return 100;
130	}
131	#endif
132
133	static unsigned get_kernel_HZ(void)
134	{
135	//char buf[64];
136	struct sysinfo info;
137
138	if (kernel_HZ)
139	return kernel_HZ;
140
141	/* Works for ELF only, Linux 2.4.0+ */
142	kernel_HZ = find_elf_note(AT_CLKTCK);
143	if (kernel_HZ == (unsigned)-1)
144	kernel_HZ = get_HZ_by_waiting();
145
146	//if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
147	// bb_perror_msg_and_die("can't read %s", "/proc/uptime");
148	//buf[sizeof(buf)-1] = '\0';
149	///sscanf(buf, "%llu", &seconds_since_boot);
150	sysinfo(&info);
151	seconds_since_boot = info.uptime;
152
153	return kernel_HZ;
154	}
155	#endif
156
157	/* Print value to buf, max size+1 chars (including trailing '\0') */
158
159	static void func_user(char buf, int size, const procps_status_t ps)
160	{
161	#if 1
162	safe_strncpy(buf, get_cached_username(ps->uid), size+1);
163	#else
164	/* "compatible" version, but it's larger */
165	/* procps 2.18 shows numeric UID if name overflows the field */
166	/* TODO: get_cached_username() returns numeric string if
167	* user has no passwd record, we will display it
168	* left-justified here; too long usernames are shown
169	* as _right-justified_ IDs. Is it worth fixing? */
170	const char *user = get_cached_username(ps->uid);
171	if (strlen(user) <= size)
172	safe_strncpy(buf, user, size+1);
173	else
174	sprintf(buf, "%*u", size, (unsigned)ps->uid);
175	#endif
176	}
177
178	static void func_group(char buf, int size, const procps_status_t ps)
179	{
180	safe_strncpy(buf, get_cached_groupname(ps->gid), size+1);
181	}
182
183	static void func_comm(char buf, int size, const procps_status_t ps)
184	{
185	safe_strncpy(buf, ps->comm, size+1);
186	}
187
188	static void func_args(char buf, int size, const procps_status_t ps)
189	{
190	read_cmdline(buf, size+1, ps->pid, ps->comm);
191	}
192
193	static void func_pid(char buf, int size, const procps_status_t ps)
194	{
195	sprintf(buf, "%*u", size, ps->pid);
196	}
197
198	static void func_ppid(char buf, int size, const procps_status_t ps)
199	{
200	sprintf(buf, "%*u", size, ps->ppid);
201	}
202
203	static void func_pgid(char buf, int size, const procps_status_t ps)
204	{
205	sprintf(buf, "%*u", size, ps->pgid);
206	}
207
208	static void put_lu(char *buf, int size, unsigned long u)
209	{
210	char buf4[5];
211
212	/* see http://en.wikipedia.org/wiki/Tera */
213	smart_ulltoa4(u, buf4, " mgtpezy");
214	buf4[4] = '\0';
215	sprintf(buf, "%.*s", size, buf4);
216	}
217
218	static void func_vsz(char buf, int size, const procps_status_t ps)
219	{
220	put_lu(buf, size, ps->vsz);
221	}
222
223	static void func_rss(char buf, int size, const procps_status_t ps)
224	{
225	put_lu(buf, size, ps->rss);
226	}
227
228	static void func_tty(char buf, int size, const procps_status_t ps)
229	{
230	buf[0] = '?';
231	buf[1] = '\0';
232	if (ps->tty_major) /* tty field of "0" means "no tty" */
233	snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
234	}
235
236	#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
237
238	static void func_rgroup(char buf, int size, const procps_status_t ps)
239	{
240	safe_strncpy(buf, get_cached_groupname(ps->rgid), size+1);
241	}
242
243	static void func_ruser(char buf, int size, const procps_status_t ps)
244	{
245	safe_strncpy(buf, get_cached_username(ps->ruid), size+1);
246	}
247
248	static void func_nice(char buf, int size, const procps_status_t ps)
249	{
250	sprintf(buf, "%*d", size, ps->niceness);
251	}
252
253	#endif
254
255	#if ENABLE_FEATURE_PS_TIME
256
257	static void func_etime(char buf, int size, const procps_status_t ps)
258	{
259	/* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
260	unsigned long mm;
261	unsigned ss;
262
263	mm = ps->start_time / get_kernel_HZ();
264	/* must be after get_kernel_HZ()! */
265	mm = seconds_since_boot - mm;
266	ss = mm % 60;
267	mm /= 60;
268	snprintf(buf, size+1, "%3lu:%02u", mm, ss);
269	}
270
271	static void func_time(char buf, int size, const procps_status_t ps)
272	{
273	/* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
274	unsigned long mm;
275	unsigned ss;
276
277	mm = (ps->utime + ps->stime) / get_kernel_HZ();
278	ss = mm % 60;
279	mm /= 60;
280	snprintf(buf, size+1, "%3lu:%02u", mm, ss);
281	}
282
283	#endif
284
285	#if ENABLE_SELINUX
286	static void func_label(char buf, int size, const procps_status_t ps)
287	{
288	safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
289	}
290	#endif
291
292	/*
293	static void func_nice(char buf, int size, const procps_status_t ps)
294	{
295	ps->???
296	}
297
298	static void func_pcpu(char buf, int size, const procps_status_t ps)
299	{
300	}
301	*/
302
303	static const ps_out_t out_spec[] = {
304	// Mandated by POSIX:
305	{ 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
306	{ 8 , "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
307	{ 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
308	{ MAX_WIDTH , "args" ,"COMMAND",func_args ,PSSCAN_COMM },
309	{ 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
310	{ 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
311	{ 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
312	#if ENABLE_FEATURE_PS_TIME
313	{ sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
314	#endif
315	#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
316	{ 5 , "nice" ,"NI" ,func_nice ,PSSCAN_NICE },
317	{ 8 , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
318	{ 8 , "ruser" ,"RUSER" ,func_ruser ,PSSCAN_RUIDGID },
319	// { 5 , "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
320	#endif
321	#if ENABLE_FEATURE_PS_TIME
322	{ 6 , "time" ,"TIME" ,func_time ,PSSCAN_STIME \| PSSCAN_UTIME },
323	#endif
324	{ 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
325	{ 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
326	// Not mandated by POSIX, but useful:
327	{ 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
328	#if ENABLE_SELINUX
329	{ 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
330	#endif
331	};
332
333	static ps_out_t* new_out_t(void)
334	{
335	out = xrealloc_vector(out, 2, out_cnt);
336	return &out[out_cnt++];
337	}
338
339	static const ps_out_t* find_out_spec(const char *name)
340	{
341	unsigned i;
342	#if ENABLE_DESKTOP
343	char buf[ARRAY_SIZE(out_spec)*7 + 1];
344	char *p = buf;
345	#endif
346
347	for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
348	if (strncmp(name, out_spec[i].name6, 6) == 0)
349	return &out_spec[i];
350	#if ENABLE_DESKTOP
351	p += sprintf(p, "%.6s,", out_spec[i].name6);
352	#endif
353	}
354	#if ENABLE_DESKTOP
355	p[-1] = '\0';
356	bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
357	#else
358	bb_error_msg_and_die("bad -o argument '%s'");
359	#endif
360	}
361
362	static void parse_o(char* opt)
363	{
364	ps_out_t* new;
365	// POSIX: "-o is blank- or comma-separated list" (FIXME)
366	char comma, equal;
367	while (1) {
368	comma = strchr(opt, ',');
369	equal = strchr(opt, '=');
370	if (comma && (!equal \|\| equal > comma)) {
371	*comma = '\0';
372	new_out_t() = find_out_spec(opt);
373	*comma = ',';
374	opt = comma + 1;
375	continue;
376	}
377	break;
378	}
379	// opt points to last spec in comma separated list.
380	// This one can have =HEADER part.
381	new = new_out_t();
382	if (equal)
383	*equal = '\0';
384	new = find_out_spec(opt);
385	if (equal) {
386	*equal = '=';
387	new->header = equal + 1;
388	// POSIX: the field widths shall be ... at least as wide as
389	// the header text (default or overridden value).
390	// If the header text is null, such as -o user=,
391	// the field width shall be at least as wide as the
392	// default header text
393	if (new->header[0]) {
394	new->width = strlen(new->header);
395	print_header = 1;
396	}
397	} else
398	print_header = 1;
399	}
400
401	static void alloc_line_buffer(void)
402	{
403	int i;
404	int width = 0;
405	for (i = 0; i < out_cnt; i++) {
406	need_flags \|= out[i].ps_flags;
407	if (out[i].header[0]) {
408	print_header = 1;
409	}
410	width += out[i].width + 1; /* "FIELD " */
411	if ((int)(width - terminal_width) > 0) {
412	/* The rest does not fit on the screen */
413	//out[i].width -= (width - terminal_width - 1);
414	out_cnt = i + 1;
415	break;
416	}
417	}
418	#if ENABLE_SELINUX
419	if (!is_selinux_enabled())
420	need_flags &= ~PSSCAN_CONTEXT;
421	#endif
422	buffer = xmalloc(width + 1); /* for trailing \0 */
423	}
424
425	static void format_header(void)
426	{
427	int i;
428	ps_out_t* op;
429	char *p;
430
431	if (!print_header)
432	return;
433	p = buffer;
434	i = 0;
435	if (out_cnt) {
436	while (1) {
437	op = &out[i];
438	if (++i == out_cnt) /* do not pad last field */
439	break;
440	p += sprintf(p, "%-*s ", op->width, op->header);
441	}
442	strcpy(p, op->header);
443	}
444	printf("%.*s\n", terminal_width, buffer);
445	}
446
447	static void format_process(const procps_status_t *ps)
448	{
449	int i, len;
450	char *p = buffer;
451	i = 0;
452	if (out_cnt) while (1) {
453	out[i].f(p, out[i].width, ps);
454	// POSIX: Any field need not be meaningful in all
455	// implementations. In such a case a hyphen ( '-' )
456	// should be output in place of the field value.
457	if (!p[0]) {
458	p[0] = '-';
459	p[1] = '\0';
460	}
461	len = strlen(p);
462	p += len;
463	len = out[i].width - len + 1;
464	if (++i == out_cnt) /* do not pad last field */
465	break;
466	p += sprintf(p, "%*s", len, "");
467	}
468	printf("%.*s\n", terminal_width, buffer);
469	}
470
471	int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
472	int ps_main(int argc UNUSED_PARAM, char **argv)
473	{
474	procps_status_t *p;
475	llist_t* opt_o = NULL;
476	int opt;
477	enum {
478	OPT_Z = (1 << 0),
479	OPT_o = (1 << 1),
480	OPT_a = (1 << 2),
481	OPT_A = (1 << 3),
482	OPT_d = (1 << 4),
483	OPT_e = (1 << 5),
484	OPT_f = (1 << 6),
485	OPT_l = (1 << 7),
486	OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
487	};
488
489	INIT_G();
490
491	// POSIX:
492	// -a Write information for all processes associated with terminals
493	// Implementations may omit session leaders from this list
494	// -A Write information for all processes
495	// -d Write information for all processes, except session leaders
496	// -e Write information for all processes (equivalent to -A)
497	// -f Generate a full listing
498	// -l Generate a long listing
499	// -o col1,col2,col3=header
500	// Select which columns to display
501	/* We allow (and ignore) most of the above. FIXME.
502	* -T is picked for threads (POSIX hasn't it standardized).
503	* procps v3.2.7 supports -T and shows tids as SPID column,
504	* it also supports -L where it shows tids as LWP column.
505	*/
506	opt_complementary = "o::";
507	opt = getopt32(argv, "Zo:aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);
508	if (opt_o) {
509	do {
510	parse_o(llist_pop(&opt_o));
511	} while (opt_o);
512	} else {
513	/* Below: parse_o() needs char, NOT const char... */
514	#if ENABLE_SELINUX
515	if (!(opt & OPT_Z) \|\| !is_selinux_enabled()) {
516	/* no -Z or no SELinux: do not show LABEL */
517	strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
518	} else
519	#endif
520	{
521	strcpy(default_o, DEFAULT_O_STR);
522	}
523	parse_o(default_o);
524	}
525	#if ENABLE_FEATURE_SHOW_THREADS
526	if (opt & OPT_T)
527	need_flags \|= PSSCAN_TASKS;
528	#endif
529
530	/* Was INT_MAX, but some libc's go belly up with printf("%.*s")
531	* and such large widths */
532	terminal_width = MAX_WIDTH;
533	if (isatty(1)) {
534	get_terminal_width_height(0, &terminal_width, NULL);
535	if (--terminal_width > MAX_WIDTH)
536	terminal_width = MAX_WIDTH;
537	}
538	alloc_line_buffer();
539	format_header();
540
541	p = NULL;
542	while ((p = procps_scan(p, need_flags)) != NULL) {
543	format_process(p);
544	}
545
546	return EXIT_SUCCESS;
547	}
548
549
550	#else /* !ENABLE_DESKTOP */
551
552
553	int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
554	int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
555	{
556	procps_status_t *p;
557	int psscan_flags = PSSCAN_PID \| PSSCAN_UIDGID
558	\| PSSCAN_STATE \| PSSCAN_VSZ \| PSSCAN_COMM;
559	unsigned terminal_width IF_NOT_FEATURE_PS_WIDE(= 79);
560	enum {
561	OPT_Z = (1 << 0) * ENABLE_SELINUX,
562	OPT_T = (1 << ENABLE_SELINUX) * ENABLE_FEATURE_SHOW_THREADS,
563	};
564	int opts = 0;
565	/* If we support any options, parse argv */
566	#if ENABLE_SELINUX \|\| ENABLE_FEATURE_SHOW_THREADS \|\| ENABLE_FEATURE_PS_WIDE
567	# if ENABLE_FEATURE_PS_WIDE
568	/* -w is a bit complicated */
569	int w_count = 0;
570	opt_complementary = "-:ww";
571	opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")"w", &w_count);
572	/* if w is given once, GNU ps sets the width to 132,
573	* if w is given more than once, it is "unlimited"
574	*/
575	if (w_count) {
576	terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
577	} else {
578	get_terminal_width_height(0, &terminal_width, NULL);
579	/* Go one less... */
580	if (--terminal_width > MAX_WIDTH)
581	terminal_width = MAX_WIDTH;
582	}
583	# else
584	/* -w is not supported, only -Z and/or -T */
585	opt_complementary = "-";
586	opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T"));
587	# endif
588	#endif
589
590	#if ENABLE_SELINUX
591	if ((opts & OPT_Z) && is_selinux_enabled()) {
592	psscan_flags = PSSCAN_PID \| PSSCAN_CONTEXT
593	\| PSSCAN_STATE \| PSSCAN_COMM;
594	puts(" PID CONTEXT STAT COMMAND");
595	} else
596	#endif
597	{
598	puts(" PID USER VSZ STAT COMMAND");
599	}
600	if (opts & OPT_T) {
601	psscan_flags \|= PSSCAN_TASKS;
602	}
603
604	p = NULL;
605	while ((p = procps_scan(p, psscan_flags)) != NULL) {
606	int len;
607	#if ENABLE_SELINUX
608	if (psscan_flags & PSSCAN_CONTEXT) {
609	len = printf("%5u %-32.32s %s ",
610	p->pid,
611	p->context ? p->context : "unknown",
612	p->state);
613	} else
614	#endif
615	{
616	const char *user = get_cached_username(p->uid);
617	//if (p->vsz == 0)
618	// len = printf("%5u %-8.8s %s ",
619	// p->pid, user, p->state);
620	//else
621	{
622	char buf6[6];
623	smart_ulltoa5(p->vsz, buf6, " mgtpezy");
624	buf6[5] = '\0';
625	len = printf("%5u %-8.8s %s %s ",
626	p->pid, user, buf6, p->state);
627	}
628	}
629
630	{
631	int sz = terminal_width - len;
632	char buf[sz + 1];
633	read_cmdline(buf, sz, p->pid, p->comm);
634	puts(buf);
635	}
636	}
637	if (ENABLE_FEATURE_CLEAN_UP)
638	clear_username_cache();
639	return EXIT_SUCCESS;
640	}
641
642	#endif /* !ENABLE_DESKTOP */