* 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.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+//config:config PS
+//config: bool "ps"
+//config: default y
+//config: help
+//config: ps gives a snapshot of the current processes.
+//config:
+//config:config FEATURE_PS_WIDE
+//config: bool "Enable wide output option (-w)"
+//config: default y
+//config: depends on PS && !DESKTOP
+//config: help
+//config: Support argument 'w' for wide output.
+//config: If given once, 132 chars are printed, and if given more
+//config: than once, the length is unlimited.
+//config:
+//config:config FEATURE_PS_LONG
+//config: bool "Enable long output option (-l)"
+//config: default y
+//config: depends on PS && !DESKTOP
+//config: help
+//config: Support argument 'l' for long output.
+//config: Adds fields PPID, RSS, START, TIME & TTY
+//config:
+//config:config FEATURE_PS_TIME
+//config: bool "Support -o time and -o etime output specifiers"
+//config: default y
+//config: depends on PS && DESKTOP
+//config: select PLATFORM_LINUX
+//config:
+//config:config FEATURE_PS_UNUSUAL_SYSTEMS
+//config: bool "Support Linux prior to 2.4.0 and non-ELF systems"
+//config: default n
+//config: depends on FEATURE_PS_TIME
+//config: help
+//config: Include support for measuring HZ on old kernels and non-ELF systems
+//config: (if you are on Linux 2.4.0+ and use ELF, you don't need this)
+//config:
+//config:config FEATURE_PS_ADDITIONAL_COLUMNS
+//config: bool "Support -o rgroup, -o ruser, -o nice specifiers"
+//config: default y
+//config: depends on PS && DESKTOP
+
+//applet:IF_PS(APPLET(ps, BB_DIR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_PS) += ps.o
+
+//usage:#if ENABLE_DESKTOP
+//usage:
+//usage:#define ps_trivial_usage
+//usage: "[-o COL1,COL2=HEADER]" IF_FEATURE_SHOW_THREADS(" [-T]")
+//usage:#define ps_full_usage "\n\n"
+//usage: "Show list of processes\n"
+//usage: "\n -o COL1,COL2=HEADER Select columns for display"
+//usage: IF_FEATURE_SHOW_THREADS(
+//usage: "\n -T Show threads"
+//usage: )
+//usage:
+//usage:#else /* !ENABLE_DESKTOP */
+//usage:
+//usage:#if !ENABLE_SELINUX && !ENABLE_FEATURE_PS_WIDE
+//usage:#define USAGE_PS "\nThis version of ps accepts no options"
+//usage:#else
+//usage:#define USAGE_PS ""
+//usage:#endif
+//usage:
+//usage:#define ps_trivial_usage
+//usage: ""
+//usage:#define ps_full_usage "\n\n"
+//usage: "Show list of processes\n"
+//usage: USAGE_PS
+//usage: IF_SELINUX(
+//usage: "\n -Z Show selinux context"
+//usage: )
+//usage: IF_FEATURE_PS_WIDE(
+//usage: "\n w Wide output"
+//usage: )
+//usage: IF_FEATURE_PS_LONG(
+//usage: "\n l Long output"
+//usage: )
+//usage: IF_FEATURE_SHOW_THREADS(
+//usage: "\n T Show threads"
+//usage: )
+//usage:
+//usage:#endif /* ENABLE_DESKTOP */
+//usage:
+//usage:#define ps_example_usage
+//usage: "$ ps\n"
+//usage: " PID Uid Gid State Command\n"
+//usage: " 1 root root S init\n"
+//usage: " 2 root root S [kflushd]\n"
+//usage: " 3 root root S [kupdate]\n"
+//usage: " 4 root root S [kpiod]\n"
+//usage: " 5 root root S [kswapd]\n"
+//usage: " 742 andersen andersen S [bash]\n"
+//usage: " 743 andersen andersen S -bash\n"
+//usage: " 745 root root S [getty]\n"
+//usage: " 2990 andersen andersen R ps\n"
#include "libbb.h"
+#include "common_bufsiz.h"
+#ifdef __linux__
+# include <sys/sysinfo.h>
+#endif
/* Absolute maximum on output line length */
enum { MAX_WIDTH = 2*1024 };
+#if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
+static unsigned long get_uptime(void)
+{
+#ifdef __linux__
+ struct sysinfo info;
+ if (sysinfo(&info) < 0)
+ return 0;
+ return info.uptime;
+#elif 1
+ unsigned long uptime;
+ char buf[sizeof(uptime)*3 + 2];
+ /* /proc/uptime is "UPTIME_SEC.NN IDLE_SEC.NN\n"
+ * (where IDLE is cumulative over all CPUs)
+ */
+ 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, "%lu", &uptime);
+ return uptime;
+#else
+ struct timespec ts;
+ if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
+ return 0;
+ return ts.tv_sec;
+#endif
+}
+#endif
+
#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")
+# define AT_CLKTCK 17
#endif
+/* TODO:
+ * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
+ * specifies (for XSI-conformant systems) following default columns
+ * (l and f mark columns shown with -l and -f respectively):
+ * F l Flags (octal and additive) associated with the process (??)
+ * S l The state of the process
+ * UID f,l The user ID; the login name is printed with -f
+ * PID The process ID
+ * PPID f,l The parent process
+ * C f,l Processor utilization
+ * PRI l The priority of the process; higher numbers mean lower priority
+ * NI l Nice value
+ * ADDR l The address of the process
+ * SZ l The size in blocks of the core image of the process
+ * WCHAN l The event for which the process is waiting or sleeping
+ * STIME f Starting time of the process
+ * TTY The controlling terminal for the process
+ * TIME The cumulative execution time for the process
+ * CMD The command name; the full command line is shown with -f
+ */
typedef struct {
uint16_t width;
char name6[6];
unsigned terminal_width;
#if ENABLE_FEATURE_PS_TIME
unsigned kernel_HZ;
- unsigned long long seconds_since_boot;
+ unsigned long seconds_since_boot;
#endif
- char default_o[sizeof(DEFAULT_O_STR)];
-};
-#define G (*(struct globals*)&bb_common_bufsiz1)
+} 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 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)
+#define INIT_G() do { setup_common_bufsiz(); } 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)
+static uintptr_t find_elf_note(uintptr_t findme)
{
- ptrdiff_t *ep = (ptrdiff_t *) environ;
+ uintptr_t *ep = (uintptr_t *) environ;
- while (*ep++);
+ while (*ep++)
+ continue;
while (*ep) {
if (ep[0] == findme) {
return ep[1];
static unsigned get_kernel_HZ(void)
{
- //char buf[64];
- struct sysinfo info;
-
if (kernel_HZ)
return kernel_HZ;
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("cannot read %s", "/proc/uptime");
- //buf[sizeof(buf)-1] = '\0';
- ///sscanf(buf, "%llu", &seconds_since_boot);
- sysinfo(&info);
- seconds_since_boot = info.uptime;
+ G.seconds_since_boot = get_uptime();
return kernel_HZ;
}
safe_strncpy(buf, ps->comm, size+1);
}
+static void func_state(char *buf, int size, const procps_status_t *ps)
+{
+ safe_strncpy(buf, ps->state, size+1);
+}
+
static void func_args(char *buf, int size, const procps_status_t *ps)
{
read_cmdline(buf, size+1, ps->pid, ps->comm);
char buf4[5];
/* see http://en.wikipedia.org/wiki/Tera */
- smart_ulltoa4(u, buf4, " mgtpezy");
- buf4[4] = '\0';
+ smart_ulltoa4(u, buf4, " mgtpezy")[0] = '\0';
sprintf(buf, "%.*s", size, buf4);
}
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)
sprintf(buf, "%*d", size, ps->niceness);
}
-#endif /* FEATURE_PS_ADDITIONAL_COLUMNS */
+#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 */
mm = ps->start_time / get_kernel_HZ();
/* must be after get_kernel_HZ()! */
- mm = seconds_since_boot - mm;
+ mm = G.seconds_since_boot - mm;
ss = mm % 60;
mm /= 60;
snprintf(buf, size+1, "%3lu:%02u", mm, ss);
mm /= 60;
snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}
+
#endif
#if ENABLE_SELINUX
*/
static const ps_out_t out_spec[] = {
-// Mandated by POSIX:
+/* Mandated by http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html: */
{ 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
{ 8 , "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
{ 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
- { 256 , "args" ,"COMMAND",func_args ,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 },
#endif
{ 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
{ 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
-// Not mandated by POSIX, but useful:
+/* Not mandated, but useful: */
+ { 4 , "stat" ,"STAT" ,func_state ,PSSCAN_STATE },
{ 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
#if ENABLE_SELINUX
{ 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
static const ps_out_t* find_out_spec(const char *name)
{
unsigned i;
+ char buf[ARRAY_SIZE(out_spec)*7 + 1];
+ char *p = buf;
+
for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
- if (!strncmp(name, out_spec[i].name6, 6))
+ if (strncmp(name, out_spec[i].name6, 6) == 0)
return &out_spec[i];
+ p += sprintf(p, "%.6s,", out_spec[i].name6);
}
- bb_error_msg_and_die("bad -o argument '%s'", name);
+ p[-1] = '\0';
+ bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
}
static void parse_o(char* opt)
print_header = 1;
}
-static void post_process(void)
+static void alloc_line_buffer(void)
{
int i;
int width = 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())
printf("%.*s\n", terminal_width, buffer);
}
+#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
+
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;
+ char default_o[sizeof(DEFAULT_O_STR)];
+#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS
int opt;
+#endif
enum {
OPT_Z = (1 << 0),
OPT_o = (1 << 1),
// -l Generate a long listing
// -o col1,col2,col3=header
// Select which columns to display
- /* We allow (and ignore) most of the above. FIXME */
- opt_complementary = "o::";
- opt = getopt32(argv, "Zo:aAdefl" IF_FEATURE_SHOW_THREADS("T"), &opt_o);
+ /* We allow (and ignore) most of the above. FIXME.
+ * -T is picked for threads (POSIX hasn't standardized it).
+ * procps v3.2.7 supports -T and shows tids as SPID column,
+ * it also supports -L where it shows tids as LWP column.
+ */
+#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS
+ opt =
+#endif
+ 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*... */
+ /* Below: parse_o() needs char*, NOT const char*,
+ * can't pass it constant string. Need to make a copy first.
+ */
#if ENABLE_SELINUX
if (!(opt & OPT_Z) || !is_selinux_enabled()) {
/* no -Z or no SELinux: do not show LABEL */
}
parse_o(default_o);
}
- post_process();
#if ENABLE_FEATURE_SHOW_THREADS
if (opt & OPT_T)
need_flags |= PSSCAN_TASKS;
* and such large widths */
terminal_width = MAX_WIDTH;
if (isatty(1)) {
- get_terminal_width_height(0, &terminal_width, NULL);
+ terminal_width = get_terminal_width(0);
if (--terminal_width > MAX_WIDTH)
terminal_width = MAX_WIDTH;
}
+ alloc_line_buffer();
format_header();
p = NULL;
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 = NULL;
- int len;
- IF_NOT_SELINUX(const) int use_selinux = 0;
- IF_SELINUX(int i;)
-#if !ENABLE_FEATURE_PS_WIDE
- enum { terminal_width = 79 };
-#else
- unsigned terminal_width;
- int w_count = 0;
+ 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,
+ OPT_l = (1 << ENABLE_SELINUX) * (1 << ENABLE_FEATURE_SHOW_THREADS) * ENABLE_FEATURE_PS_LONG,
+ };
+#if ENABLE_FEATURE_PS_LONG
+ time_t now = now; /* for compiler */
+ unsigned long uptime = uptime;
#endif
-
-#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
-#if ENABLE_FEATURE_PS_WIDE
+ /* If we support any options, parse argv */
+#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE || ENABLE_FEATURE_PS_LONG
+ int opts = 0;
+# if ENABLE_FEATURE_PS_WIDE
+ /* -w is a bit complicated */
+ int w_count = 0;
opt_complementary = "-:ww";
- IF_SELINUX(i =) getopt32(argv, IF_SELINUX("Z") "w", &w_count);
+ opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l")
+ "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;
+ terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
} else {
- get_terminal_width_height(0, &terminal_width, NULL);
+ terminal_width = get_terminal_width(0);
/* Go one less... */
if (--terminal_width > MAX_WIDTH)
terminal_width = MAX_WIDTH;
}
-#else /* only ENABLE_SELINUX */
- i = getopt32(argv, "Z");
-#endif
-#if ENABLE_SELINUX
- if ((i & 1) && is_selinux_enabled())
- use_selinux = PSSCAN_CONTEXT;
-#endif
-#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
-
- if (use_selinux)
+# else
+ /* -w is not supported, only -Z and/or -T */
+ opt_complementary = "-";
+ opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l"));
+# 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
+ } else
+# endif
+ if (opts & OPT_l) {
+ psscan_flags = PSSCAN_STATE | PSSCAN_UIDGID | PSSCAN_PID | PSSCAN_PPID
+ | PSSCAN_TTY | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_COMM
+ | PSSCAN_VSZ | PSSCAN_RSS;
+/* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
+ * mandates for -l:
+ * -F Flags (?)
+ * S State
+ * UID,PID,PPID
+ * -C CPU usage
+ * -PRI The priority of the process; higher numbers mean lower priority
+ * -NI Nice value
+ * -ADDR The address of the process (?)
+ * SZ The size in blocks of the core image
+ * -WCHAN The event for which the process is waiting or sleeping
+ * TTY
+ * TIME The cumulative execution time
+ * CMD
+ * We don't show fields marked with '-'.
+ * We show VSZ and RSS instead of SZ.
+ * We also show STIME (standard says that -f shows it, -l doesn't).
+ */
+ puts("S UID PID PPID VSZ RSS TTY STIME TIME CMD");
+# if ENABLE_FEATURE_PS_LONG
+ now = time(NULL);
+ uptime = get_uptime();
+# endif
+ }
+ else {
puts(" PID USER VSZ STAT COMMAND");
+ }
+ if (opts & OPT_T) {
+ psscan_flags |= PSSCAN_TASKS;
+ }
+#endif
- while ((p = procps_scan(p, 0
- | PSSCAN_PID
- | PSSCAN_UIDGID
- | PSSCAN_STATE
- | PSSCAN_VSZ
- | PSSCAN_COMM
- | use_selinux
- )) != NULL) {
+ p = NULL;
+ while ((p = procps_scan(p, psscan_flags)) != NULL) {
+ int len;
#if ENABLE_SELINUX
- if (use_selinux) {
+ if (psscan_flags & PSSCAN_CONTEXT) {
len = printf("%5u %-32.32s %s ",
p->pid,
p->context ? p->context : "unknown",
} 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")[0] = '\0';
+#if ENABLE_FEATURE_PS_LONG
+ if (opts & OPT_l) {
+ char bufr[6], stime_str[6];
+ char tty[2 * sizeof(int)*3 + 2];
+ char *endp;
+ unsigned sut = (p->stime + p->utime) / 100;
+ unsigned elapsed = uptime - (p->start_time / 100);
+ time_t start = now - elapsed;
+ struct tm *tm = localtime(&start);
+
+ smart_ulltoa5(p->rss, bufr, " mgtpezy")[0] = '\0';
+
+ if (p->tty_major == 136)
+ /* It should be pts/N, not ptsN, but N > 9
+ * will overflow field width...
+ */
+ endp = stpcpy(tty, "pts");
+ else
+ if (p->tty_major == 4) {
+ endp = stpcpy(tty, "tty");
+ if (p->tty_minor >= 64) {
+ p->tty_minor -= 64;
+ *endp++ = 'S';
+ }
+ }
+ else
+ endp = tty + sprintf(tty, "%d:", p->tty_major);
+ strcpy(endp, utoa(p->tty_minor));
+
+ strftime(stime_str, 6, (elapsed >= (24 * 60 * 60)) ? "%b%d" : "%H:%M", tm);
+ stime_str[5] = '\0';
+ // S UID PID PPID VSZ RSS TTY STIME TIME CMD
+ len = printf("%c %5u %5u %5u %5s %5s %-5s %s %02u:%02u:%02u ",
+ p->state[0], p->uid, p->pid, p->ppid, buf6, bufr, tty,
+ stime_str, sut / 3600, (sut % 3600) / 60, sut % 60);
+ } else
+#endif
{
- char buf6[6];
- smart_ulltoa5(p->vsz, buf6, " mgtpezy");
- buf6[5] = '\0';
+ const char *user = get_cached_username(p->uid);
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 (sz >= 0) {
+ char buf[sz + 1];
+ read_cmdline(buf, sz, p->pid, p->comm);
+ puts(buf);
+ }
}
}
if (ENABLE_FEATURE_CLEAN_UP)
return EXIT_SUCCESS;
}
-#endif /* ENABLE_DESKTOP */
+#endif /* !ENABLE_DESKTOP */