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/* vi: set sw=4 ts=4: */
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* Mini ps implementation(s) for busybox
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
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* (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
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* Licensed under GPLv2, see file LICENSE in this source tree.
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//config: bool "ps (12 kb)"
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//config: ps gives a snapshot of the current processes.
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//config:config FEATURE_PS_WIDE
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//config: bool "Enable wide output (-w)"
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//config: depends on (PS || MINIPS) && !DESKTOP
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//config: Support argument 'w' for wide output.
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//config: If given once, 132 chars are printed, and if given more
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//config: than once, the length is unlimited.
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//config:config FEATURE_PS_LONG
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//config: bool "Enable long output (-l)"
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//config: depends on (PS || MINIPS) && !DESKTOP
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//config: Support argument 'l' for long output.
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//config: Adds fields PPID, RSS, START, TIME & TTY
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//config:config FEATURE_PS_TIME
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//config: bool "Enable -o time and -o etime specifiers"
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//config: depends on (PS || MINIPS) && DESKTOP
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//config:config FEATURE_PS_UNUSUAL_SYSTEMS
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//config: bool "Support Linux prior to 2.4.0 and non-ELF systems"
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//config: depends on FEATURE_PS_TIME
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//config: Include support for measuring HZ on old kernels and non-ELF systems
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//config: (if you are on Linux 2.4.0+ and use ELF, you don't need this)
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//config:config FEATURE_PS_ADDITIONAL_COLUMNS
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//config: bool "Enable -o rgroup, -o ruser, -o nice specifiers"
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//config: depends on (PS || MINIPS) && DESKTOP
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// APPLET_NOEXEC:name main location suid_type help
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//applet:IF_PS( APPLET_NOEXEC(ps, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
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//applet:IF_MINIPS(APPLET_NOEXEC(minips, ps, BB_DIR_BIN, BB_SUID_DROP, ps))
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//kbuild:lib-$(CONFIG_PS) += ps.o
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//kbuild:lib-$(CONFIG_MINIPS) += ps.o
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//usage:#if ENABLE_DESKTOP
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//usage:#define ps_trivial_usage
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//usage: "[-o COL1,COL2=HEADER]" IF_FEATURE_SHOW_THREADS(" [-T]")
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//usage:#define ps_full_usage "\n\n"
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//usage: "Show list of processes\n"
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//usage: "\n -o COL1,COL2=HEADER Select columns for display"
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//usage: IF_FEATURE_SHOW_THREADS(
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//usage: "\n -T Show threads"
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//usage:#else /* !ENABLE_DESKTOP */
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//usage:#if !ENABLE_SELINUX && !ENABLE_FEATURE_PS_WIDE
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//usage:#define USAGE_PS "\nThis version of ps accepts no options"
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//usage:#define USAGE_PS ""
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//usage:#define ps_trivial_usage
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//usage:#define ps_full_usage "\n\n"
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//usage: "Show list of processes\n"
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//usage: "\n -Z Show selinux context"
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//usage: IF_FEATURE_PS_WIDE(
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//usage: "\n w Wide output"
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//usage: IF_FEATURE_PS_LONG(
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//usage: "\n l Long output"
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//usage: IF_FEATURE_SHOW_THREADS(
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//usage: "\n T Show threads"
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//usage:#endif /* ENABLE_DESKTOP */
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//usage:#define ps_example_usage
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//usage: " PID Uid Gid State Command\n"
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//usage: " 1 root root S init\n"
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//usage: " 2 root root S [kflushd]\n"
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//usage: " 3 root root S [kupdate]\n"
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//usage: " 4 root root S [kpiod]\n"
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//usage: " 5 root root S [kswapd]\n"
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//usage: " 742 andersen andersen S [bash]\n"
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//usage: " 743 andersen andersen S -bash\n"
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//usage: " 745 root root S [getty]\n"
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//usage: " 2990 andersen andersen R ps\n"
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#include "common_bufsiz.h"
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# include <sys/sysinfo.h>
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/* Absolute maximum on output line length */
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enum { MAX_WIDTH = 2*1024 };
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#if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
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static unsigned long get_uptime(void)
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if (sysinfo(&info) < 0)
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unsigned long uptime;
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char buf[sizeof(uptime)*3 + 2];
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/* /proc/uptime is "UPTIME_SEC.NN IDLE_SEC.NN\n"
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* (where IDLE is cumulative over all CPUs)
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if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
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bb_perror_msg_and_die("can't read '%s'", "/proc/uptime");
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buf[sizeof(buf)-1] = '\0';
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sscanf(buf, "%lu", &uptime);
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if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
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* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
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* specifies (for XSI-conformant systems) following default columns
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* (l and f mark columns shown with -l and -f respectively):
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* F l Flags (octal and additive) associated with the process (??)
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* S l The state of the process
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* UID f,l The user ID; the login name is printed with -f
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* PPID f,l The parent process
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* C f,l Processor utilization
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* PRI l The priority of the process; higher numbers mean lower priority
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* ADDR l The address of the process
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* SZ l The size in blocks of the core image of the process
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* WCHAN l The event for which the process is waiting or sleeping
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* STIME f Starting time of the process
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* TTY The controlling terminal for the process
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* TIME The cumulative execution time for the process
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* CMD The command name; the full command line is shown with -f
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void (*f)(char *buf, int size, const procps_status_t *ps);
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unsigned terminal_width;
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#if ENABLE_FEATURE_PS_TIME
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# if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS || !defined(__linux__)
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unsigned long seconds_since_boot;
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define out_cnt (G.out_cnt )
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#define print_header (G.print_header )
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#define need_flags (G.need_flags )
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#define buffer (G.buffer )
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#define terminal_width (G.terminal_width )
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#define INIT_G() do { setup_common_bufsiz(); } while (0)
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#if ENABLE_FEATURE_PS_TIME
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# if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS || !defined(__linux__)
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# define get_kernel_HZ() (G.kernel_HZ)
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/* non-ancient Linux standardized on 100 for "times" freq */
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# define get_kernel_HZ() ((unsigned)100)
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/* Print value to buf, max size+1 chars (including trailing '\0') */
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static void func_user(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, get_cached_username(ps->uid), size+1);
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/* "compatible" version, but it's larger */
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/* procps 2.18 shows numeric UID if name overflows the field */
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/* TODO: get_cached_username() returns numeric string if
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* user has no passwd record, we will display it
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* left-justified here; too long usernames are shown
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* as _right-justified_ IDs. Is it worth fixing? */
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const char *user = get_cached_username(ps->uid);
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if (strlen(user) <= size)
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safe_strncpy(buf, user, size+1);
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sprintf(buf, "%*u", size, (unsigned)ps->uid);
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static void func_group(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, get_cached_groupname(ps->gid), size+1);
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static void func_comm(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, ps->comm, size+1);
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static void func_state(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, ps->state, size+1);
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static void func_args(char *buf, int size, const procps_status_t *ps)
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read_cmdline(buf, size+1, ps->pid, ps->comm);
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static void func_pid(char *buf, int size, const procps_status_t *ps)
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sprintf(buf, "%*u", size, ps->pid);
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static void func_ppid(char *buf, int size, const procps_status_t *ps)
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sprintf(buf, "%*u", size, ps->ppid);
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static void func_pgid(char *buf, int size, const procps_status_t *ps)
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sprintf(buf, "%*u", size, ps->pgid);
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static void func_sid(char *buf, int size, const procps_status_t *ps)
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sprintf(buf, "%*u", size, ps->sid);
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static void put_lu(char *buf, int size, unsigned long u)
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/* see http://en.wikipedia.org/wiki/Tera */
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smart_ulltoa4(u, buf4, " mgtpezy")[0] = '\0';
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sprintf(buf, "%.*s", size, buf4);
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static void func_vsz(char *buf, int size, const procps_status_t *ps)
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put_lu(buf, size, ps->vsz);
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static void func_rss(char *buf, int size, const procps_status_t *ps)
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put_lu(buf, size, ps->rss);
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static void func_tty(char *buf, int size, const procps_status_t *ps)
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if (ps->tty_major) /* tty field of "0" means "no tty" */
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snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
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#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
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static void func_rgroup(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, get_cached_groupname(ps->rgid), size+1);
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static void func_ruser(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, get_cached_username(ps->ruid), size+1);
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static void func_nice(char *buf, int size, const procps_status_t *ps)
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sprintf(buf, "%*d", size, ps->niceness);
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#if ENABLE_FEATURE_PS_TIME
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static void format_time(char *buf, int size, unsigned long tt)
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/* Used to show "14453:50" if tt is large. Ugly.
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* procps-ng 3.3.10 uses "[[dd-]hh:]mm:ss" format.
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* TODO: switch to that?
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/* Formatting for 5-char TIME column.
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* NB: "size" is not always 5: ELAPSED is wider (7),
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* not taking advantage of that (yet?).
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snprintf(buf, size+1, "%2u:%02u", (unsigned)tt, ff);
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snprintf(buf, size+1, "%2uh%02u", (unsigned)tt, ff);
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snprintf(buf, size+1, "%2ud%02u", (unsigned)tt, ff);
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snprintf(buf, size+1, "%4lud", tt);
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static void func_etime(char *buf, int size, const procps_status_t *ps)
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/* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
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mm = ps->start_time / get_kernel_HZ();
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mm = G.seconds_since_boot - mm;
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format_time(buf, size, mm);
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static void func_time(char *buf, int size, const procps_status_t *ps)
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/* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
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mm = (ps->utime + ps->stime) / get_kernel_HZ();
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format_time(buf, size, mm);
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static void func_label(char *buf, int size, const procps_status_t *ps)
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safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
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static void func_pcpu(char *buf, int size, const procps_status_t *ps)
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static const ps_out_t out_spec[] ALIGN_PTR = {
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/* Mandated by http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html: */
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{ 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
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{ 8 , "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
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{ 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
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{ MAX_WIDTH , "args" ,"COMMAND",func_args ,PSSCAN_COMM },
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{ 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
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{ 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
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{ 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
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#if ENABLE_FEATURE_PS_TIME
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{ sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
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#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
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{ 5 , "nice" ,"NI" ,func_nice ,PSSCAN_NICE },
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{ 8 , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
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{ 8 , "ruser" ,"RUSER" ,func_ruser ,PSSCAN_RUIDGID },
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// { 5 , "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
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#if ENABLE_FEATURE_PS_TIME
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{ 5 , "time" ,"TIME" ,func_time ,PSSCAN_STIME | PSSCAN_UTIME },
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{ 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
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{ 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
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/* Not mandated, but useful: */
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{ 5 , "sid" ,"SID" ,func_sid ,PSSCAN_SID },
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{ 4 , "stat" ,"STAT" ,func_state ,PSSCAN_STATE },
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{ 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
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{ 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
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static ps_out_t* new_out_t(void)
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out = xrealloc_vector(out, 2, out_cnt);
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return &out[out_cnt++];
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static const ps_out_t* find_out_spec(const char *name)
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char buf[ARRAY_SIZE(out_spec)*7 + 1];
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for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
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if (strncmp(name, out_spec[i].name6, 6) == 0)
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p += sprintf(p, "%.6s,", out_spec[i].name6);
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bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
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static void parse_o(char* opt)
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// POSIX: "-o is blank- or comma-separated list" (FIXME)
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comma = strchr(opt, ',');
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equal = strchr(opt, '=');
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if (comma && (!equal || equal > comma)) {
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*new_out_t() = *find_out_spec(opt);
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// opt points to last spec in comma separated list.
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// This one can have =HEADER part.
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*new = *find_out_spec(opt);
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comma = strchr(equal, ',');
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// POSIX: the field widths shall be ... at least as wide as
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// the header text (default or overridden value).
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// If the header text is null, such as -o user=,
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// the field width shall be at least as wide as the
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// default header text
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if (new->header[0]) {
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new->width = strlen(new->header);
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//*comma = ','; /* no, new->header should stay NUL-terminated */
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static void alloc_line_buffer(void)
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for (i = 0; i < out_cnt; i++) {
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need_flags |= out[i].ps_flags;
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if (out[i].header[0]) {
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width += out[i].width + 1; /* "FIELD " */
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if ((int)(width - terminal_width) > 0) {
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/* The rest does not fit on the screen */
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//out[i].width -= (width - terminal_width - 1);
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if (!is_selinux_enabled())
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need_flags &= ~PSSCAN_CONTEXT;
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buffer = xmalloc(width + 1); /* for trailing \0 */
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static void format_header(void)
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if (++i == out_cnt) /* do not pad last field */
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p += sprintf(p, "%-*s ", op->width, op->header);
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strcpy(p, op->header);
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printf("%.*s\n", terminal_width, buffer);
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static void format_process(const procps_status_t *ps)
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if (out_cnt) while (1) {
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out[i].f(p, out[i].width, ps);
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// POSIX: Any field need not be meaningful in all
528
// implementations. In such a case a hyphen ( '-' )
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// should be output in place of the field value.
536
len = out[i].width - len + 1;
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if (++i == out_cnt) /* do not pad last field */
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p += sprintf(p, "%*s", len, " "); /* " ", not "", to ensure separation of fields */
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printf("%.*s\n", terminal_width, buffer);
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# define SELINUX_O_PREFIX "label,"
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# define DEFAULT_O_STR (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
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# define DEFAULT_O_STR ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
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int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ps_main(int argc UNUSED_PARAM, char **argv)
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llist_t* opt_o = NULL;
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char default_o[sizeof(DEFAULT_O_STR)];
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#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS
569
OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
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#if ENABLE_FEATURE_PS_TIME
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G.seconds_since_boot = get_uptime();
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# if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS || !defined(__linux__)
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G.kernel_HZ = bb_clk_tck(); /* this is sysconf(_SC_CLK_TCK) */
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// -a Write information for all processes associated with terminals
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// Implementations may omit session leaders from this list
583
// -A Write information for all processes
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// -d Write information for all processes, except session leaders
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// -e Write information for all processes (equivalent to -A)
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// -f Generate a full listing
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// -l Generate a long listing
588
// -o col1,col2,col3=header
589
// Select which columns to display
590
/* We allow (and ignore) most of the above. FIXME.
591
* -T is picked for threads (POSIX hasn't standardized it).
592
* procps v3.2.7 supports -T and shows tids as SPID column,
593
* it also supports -L where it shows tids as LWP column.
595
#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS
598
getopt32(argv, "Zo:*aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);
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parse_o(llist_pop(&opt_o));
605
/* Below: parse_o() needs char*, NOT const char*,
606
* can't pass it constant string. Need to make a copy first.
609
if (!(opt & OPT_Z) || !is_selinux_enabled()) {
610
/* no -Z or no SELinux: do not show LABEL */
611
strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
615
strcpy(default_o, DEFAULT_O_STR);
619
#if ENABLE_FEATURE_SHOW_THREADS
621
need_flags |= PSSCAN_TASKS;
624
/* Was INT_MAX, but some libc's go belly up with printf("%.*s")
625
* and such large widths */
626
terminal_width = MAX_WIDTH;
628
terminal_width = get_terminal_width(0);
629
if (--terminal_width > MAX_WIDTH)
630
terminal_width = MAX_WIDTH;
636
while ((p = procps_scan(p, need_flags)) != NULL) {
644
#else /* !ENABLE_DESKTOP */
647
int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
648
int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
651
int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
652
| PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
653
unsigned terminal_width IF_NOT_FEATURE_PS_WIDE(= 79);
655
OPT_Z = (1 << 0) * ENABLE_SELINUX,
656
OPT_T = (1 << ENABLE_SELINUX) * ENABLE_FEATURE_SHOW_THREADS,
657
OPT_l = (1 << ENABLE_SELINUX) * (1 << ENABLE_FEATURE_SHOW_THREADS) * ENABLE_FEATURE_PS_LONG,
659
#if ENABLE_FEATURE_PS_LONG
660
time_t now = now; /* for compiler */
661
unsigned long uptime = uptime;
663
/* If we support any options, parse argv */
664
#if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE || ENABLE_FEATURE_PS_LONG
666
# if ENABLE_FEATURE_PS_WIDE
667
/* -w is a bit complicated */
669
make_all_argv_opts(argv);
670
opts = getopt32(argv, "^"
671
IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l")"w"
675
/* if w is given once, GNU ps sets the width to 132,
676
* if w is given more than once, it is "unlimited"
679
terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
681
terminal_width = get_terminal_width(0);
683
if (--terminal_width > MAX_WIDTH)
684
terminal_width = MAX_WIDTH;
687
/* -w is not supported, only -Z and/or -T */
688
make_all_argv_opts(argv);
689
opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l"));
693
if ((opts & OPT_Z) && is_selinux_enabled()) {
694
psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
695
| PSSCAN_STATE | PSSCAN_COMM;
696
puts(" PID CONTEXT STAT COMMAND");
700
psscan_flags = PSSCAN_STATE | PSSCAN_UIDGID | PSSCAN_PID | PSSCAN_PPID
701
| PSSCAN_TTY | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_COMM
702
| PSSCAN_VSZ | PSSCAN_RSS;
703
/* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
709
* -PRI The priority of the process; higher numbers mean lower priority
711
* -ADDR The address of the process (?)
712
* SZ The size in blocks of the core image
713
* -WCHAN The event for which the process is waiting or sleeping
715
* TIME The cumulative execution time
717
* We don't show fields marked with '-'.
718
* We show VSZ and RSS instead of SZ.
719
* We also show STIME (standard says that -f shows it, -l doesn't).
721
puts("S UID PID PPID VSZ RSS TTY STIME TIME CMD");
722
# if ENABLE_FEATURE_PS_LONG
724
uptime = get_uptime();
728
puts(" PID USER VSZ STAT COMMAND");
731
psscan_flags |= PSSCAN_TASKS;
736
while ((p = procps_scan(p, psscan_flags)) != NULL) {
739
if (psscan_flags & PSSCAN_CONTEXT) {
740
len = printf("%5u %-32.32s %s ",
742
p->context ? p->context : "unknown",
748
smart_ulltoa5(p->vsz, buf6, " mgtpezy")[0] = '\0';
749
#if ENABLE_FEATURE_PS_LONG
751
char bufr[6], stime_str[6];
752
char tty[2 * sizeof(int)*3 + 2];
754
unsigned sut = (p->stime + p->utime) / 100;
755
unsigned elapsed = uptime - (p->start_time / 100);
756
time_t start = now - elapsed;
757
struct tm *tm = localtime(&start);
759
smart_ulltoa5(p->rss, bufr, " mgtpezy")[0] = '\0';
761
if (p->tty_major == 136)
762
/* It should be pts/N, not ptsN, but N > 9
763
* will overflow field width...
765
endp = stpcpy(tty, "pts");
767
if (p->tty_major == 4) {
768
endp = stpcpy(tty, "tty");
769
if (p->tty_minor >= 64) {
775
endp = tty + sprintf(tty, "%d:", p->tty_major);
776
strcpy(endp, utoa(p->tty_minor));
778
strftime(stime_str, 6, (elapsed >= (24 * 60 * 60)) ? "%b%d" : "%H:%M", tm);
780
// S UID PID PPID VSZ RSS TTY STIME TIME CMD
781
len = printf("%c %5u %5u %5u %5s %5s %-5s %s %02u:%02u:%02u ",
782
p->state[0], p->uid, p->pid, p->ppid, buf6, bufr, tty,
783
stime_str, sut / 3600, (sut % 3600) / 60, sut % 60);
787
const char *user = get_cached_username(p->uid);
788
len = printf("%5u %-8.8s %s %s ",
789
p->pid, user, buf6, p->state);
794
int sz = terminal_width - len;
797
read_cmdline(buf, sz, p->pid, p->comm);
802
if (ENABLE_FEATURE_CLEAN_UP)
803
clear_username_cache();
807
#endif /* !ENABLE_DESKTOP */
2
* Mini ps implementation for busybox
5
* Copyright (C) 1999 by Lineo, inc.
6
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8
* This program is free software; you can redistribute it and/or modify
9
* it under the terms of the GNU General Public License as published by
10
* the Free Software Foundation; either version 2 of the License, or
11
* (at your option) any later version.
13
* This program is distributed in the hope that it will be useful,
14
* but WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
18
* You should have received a copy of the GNU General Public License
19
* along with this program; if not, write to the Free Software
20
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32
typedef struct proc_s {
34
cmd[16]; /* basename of executable file in call to exec(2) */
36
ruid, rgid, /* real only (sorry) */
38
ppid; /* pid of parent process */
40
state; /* single-char code for process state (S=sleeping) */
45
static int file2str(char *filename, char *ret, int cap)
49
if ( (fd = open(filename, O_RDONLY, 0)) == -1 ) return -1;
50
if ( (num_read = read(fd, ret, cap - 1)) <= 0 ) return -1;
57
static void parse_proc_status(char* S, proc_t* P)
60
memset(P->cmd, 0, sizeof P->cmd);
61
sscanf (S, "Name:\t%15c", P->cmd);
62
tmp = strchr(P->cmd,'\n');
65
tmp = strstr (S,"State");
66
sscanf (tmp, "State:\t%c", &P->state);
68
tmp = strstr (S,"Pid:");
75
else fprintf(stderr, "Internal error!\n");
77
/* For busybox, ignoring effective, saved, etc */
78
tmp = strstr (S,"Uid:");
80
"Uid:\t%d", &P->ruid);
81
else fprintf(stderr, "Internal error!\n");
83
tmp = strstr (S,"Gid:");
85
"Gid:\t%d", &P->rgid);
86
else fprintf(stderr, "Internal error!\n");
91
extern int ps_main(int argc, char **argv)
97
char path[32], sbuf[512];
99
char groupName[10]="";
102
if ( argc>1 && **(argv+1) == '-' ) {
103
usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
106
dir = opendir("/proc");
108
perror("Can't open /proc");
112
fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
113
while ((entry = readdir(dir)) != NULL) {
117
if (! isdigit(*entry->d_name))
119
sprintf(path, "/proc/%s/status", entry->d_name);
120
if ((file2str(path, sbuf, sizeof sbuf)) != -1 ) {
121
parse_proc_status(sbuf, &p);
124
/* Make some adjustments as needed */
125
my_getpwuid( uidName, p.ruid);
126
my_getgrgid( groupName, p.rgid);
127
if (*uidName == '\0')
128
sprintf( uidName, "%d", p.ruid);
129
if (*groupName == '\0')
130
sprintf( groupName, "%d", p.rgid);
132
fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
133
sprintf(path, "/proc/%s/cmdline", entry->d_name);
134
file = fopen(path, "r");
140
while (((c = getc(file)) != EOF) && (i < 53)) {
147
fprintf(stdout, "%s", p.cmd);
148
fprintf(stdout, "\n");
added
removed
procps/ps.c
