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/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)];
};
#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 /* FEATURE_PS_ADDITIONAL_COLUMNS */

#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;
	for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
		if (!strncmp(name, out_spec[i].name6, 6))
			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;
	}
	// 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 len;
	int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
			| PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
#if !ENABLE_FEATURE_PS_WIDE
	enum { terminal_width = 79 };
#else
	unsigned terminal_width;
#endif

#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
	int opts;
# if ENABLE_FEATURE_PS_WIDE
	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 /* only ENABLE_SELINUX */
	opts = getopt32(argv, "Z"IF_FEATURE_SHOW_THREADS("T"));
# endif
# if ENABLE_SELINUX
	if ((opts & 1) && is_selinux_enabled())
		psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
				| PSSCAN_STATE | PSSCAN_COMM;
# endif
# if ENABLE_FEATURE_SHOW_THREADS
	if (opts & (1 << ENABLE_SELINUX))
		psscan_flags |= PSSCAN_TASKS;
# endif
#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */

	if (psscan_flags & PSSCAN_CONTEXT)
		puts("  PID CONTEXT                          STAT COMMAND");
	else
		puts("  PID USER       VSZ STAT COMMAND");

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