425 lines
11 KiB
C
425 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini ps implementation(s) for busybox
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*
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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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*
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* Licensed under the GPL version 2, see the file LICENSE in this tarball.
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*/
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#include "libbb.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_DESKTOP
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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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{
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safe_strncpy(buf, get_cached_username(ps->uid), size+1);
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}
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static void func_comm(char *buf, int size, const procps_status_t *ps)
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{
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safe_strncpy(buf, ps->comm, size+1);
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}
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static void func_args(char *buf, int size, const procps_status_t *ps)
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{
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read_cmdline(buf, size, ps->pid, ps->comm);
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}
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static void func_pid(char *buf, int size, const procps_status_t *ps)
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{
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sprintf(buf, "%*u", size, ps->pid);
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}
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static void func_ppid(char *buf, int size, const procps_status_t *ps)
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{
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sprintf(buf, "%*u", size, ps->ppid);
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}
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static void func_pgid(char *buf, int size, const procps_status_t *ps)
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{
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sprintf(buf, "%*u", size, ps->pgid);
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}
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static void put_lu(char *buf, int size, unsigned long u)
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{
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char buf5[5];
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smart_ulltoa5( ((unsigned long long)u) << 10, buf5);
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sprintf(buf, "%.*s", size, buf5);
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}
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static void func_vsz(char *buf, int size, const procps_status_t *ps)
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{
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put_lu(buf, size, ps->vsz);
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}
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static void func_rss(char *buf, int size, const procps_status_t *ps)
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{
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put_lu(buf, size, ps->rss);
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}
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static void func_tty(char *buf, int size, const procps_status_t *ps)
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{
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buf[0] = '?';
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buf[1] = '\0';
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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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}
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#if ENABLE_SELINUX
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static void func_label(char *buf, int size, const procps_status_t *ps)
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{
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safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
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}
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#endif
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/*
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static void func_nice(char *buf, int size, const procps_status_t *ps)
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{
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ps->???
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}
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static void func_etime(char *buf, int size, const procps_status_t *ps)
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{
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elapled time [[dd-]hh:]mm:ss
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}
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static void func_time(char *buf, int size, const procps_status_t *ps)
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{
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cumulative time [[dd-]hh:]mm:ss
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}
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static void func_pcpu(char *buf, int size, const procps_status_t *ps)
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{
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}
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*/
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typedef struct {
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uint16_t width;
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char name[6];
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const char *header;
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void (*f)(char *buf, int size, const procps_status_t *ps);
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int ps_flags;
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} ps_out_t;
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static const ps_out_t out_spec[] = {
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// Mandated by POSIX:
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{ 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
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{ 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
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{ 256 , "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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// { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_ },
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// { sizeof("GROUP" )-1, "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
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// { sizeof("NI" )-1, "nice" ,"NI" ,func_nice ,PSSCAN_ },
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// { sizeof("%CPU" )-1, "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
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// { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID },
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// { sizeof("RUSER" )-1, "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID },
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// { sizeof("TIME" )-1, "time" ,"TIME" ,func_time ,PSSCAN_ },
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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 by POSIX, but useful:
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{ 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
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#if ENABLE_SELINUX
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{ 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
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#endif
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};
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#if ENABLE_SELINUX
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#define SELINIX_O_PREFIX "label,"
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#define DEFAULT_O_STR SELINIX_O_PREFIX "pid,user" /* TODO: ,vsz,stat */ ",args"
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#else
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#define DEFAULT_O_STR "pid,user" /* TODO: ,vsz,stat */ ",args"
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#endif
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struct globals {
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ps_out_t* out;
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int out_cnt;
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int print_header;
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int need_flags;
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char *buffer;
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unsigned terminal_width;
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char default_o[sizeof(DEFAULT_O_STR)];
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define out (G.out )
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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 default_o (G.default_o )
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static ps_out_t* new_out_t(void)
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{
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int i = out_cnt++;
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out = xrealloc(out, out_cnt * sizeof(*out));
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return &out[i];
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}
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static const ps_out_t* find_out_spec(const char *name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
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if (!strcmp(name, out_spec[i].name))
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return &out_spec[i];
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}
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bb_error_msg_and_die("bad -o argument '%s'", name);
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}
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static void parse_o(char* opt)
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{
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ps_out_t* new;
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// POSIX: "-o is blank- or comma-separated list" (FIXME)
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char *comma, *equal;
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while (1) {
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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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*comma = '\0';
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*new_out_t() = *find_out_spec(opt);
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*comma = ',';
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opt = comma + 1;
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continue;
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}
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break;
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}
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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 = new_out_t();
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if (equal)
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*equal = '\0';
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*new = *find_out_spec(opt);
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if (equal) {
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*equal = '=';
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new->header = equal + 1;
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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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print_header = 1;
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}
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} else
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print_header = 1;
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}
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static void post_process(void)
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{
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int i;
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int width = 0;
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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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print_header = 1;
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}
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width += out[i].width + 1; /* "FIELD " */
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}
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#if ENABLE_SELINUX
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if (!is_selinux_enabled())
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need_flags &= ~PSSCAN_CONTEXT;
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#endif
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buffer = xmalloc(width + 1); /* for trailing \0 */
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}
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static void format_header(void)
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{
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int i;
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ps_out_t* op;
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char *p;
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if (!print_header)
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return;
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p = buffer;
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i = 0;
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if (out_cnt) {
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while (1) {
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op = &out[i];
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if (++i == out_cnt) /* do not pad last field */
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break;
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p += sprintf(p, "%-*s ", op->width, op->header);
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}
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strcpy(p, op->header);
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}
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printf("%.*s\n", terminal_width, buffer);
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}
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static void format_process(const procps_status_t *ps)
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{
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int i, len;
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char *p = buffer;
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i = 0;
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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
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// implementations. In such a case a hyphen ( '-' )
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// should be output in place of the field value.
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if (!p[0]) {
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p[0] = '-';
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p[1] = '\0';
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}
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len = strlen(p);
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p += len;
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len = out[i].width - len + 1;
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if (++i == out_cnt) /* do not pad last field */
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break;
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p += sprintf(p, "%*s", len, "");
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}
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printf("%.*s\n", terminal_width, buffer);
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}
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int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ps_main(int argc, char **argv)
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{
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procps_status_t *p;
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llist_t* opt_o = NULL;
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USE_SELINUX(int opt;)
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// POSIX:
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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
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// -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
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// -o col1,col2,col3=header
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// Select which columns to display
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/* We allow (and ignore) most of the above. FIXME */
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opt_complementary = "o::";
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USE_SELINUX(opt =) getopt32(argv, "Zo:aAdefl", &opt_o);
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if (opt_o) {
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do {
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parse_o(opt_o->data);
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opt_o = opt_o->link;
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} while (opt_o);
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} else {
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/* Below: parse_o() needs char*, NOT const char*... */
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#if ENABLE_SELINUX
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if (!(opt & 1) || !is_selinux_enabled()) {
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/* no -Z or no SELinux: do not show LABEL */
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strcpy(default_o, DEFAULT_O_STR + sizeof(SELINIX_O_PREFIX)-1);
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} else
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#endif
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{
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strcpy(default_o, DEFAULT_O_STR);
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}
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parse_o(default_o);
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}
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post_process();
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/* Was INT_MAX, but some libc's go belly up with printf("%.*s")
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* and such large widths */
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terminal_width = MAX_WIDTH;
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if (isatty(1)) {
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get_terminal_width_height(0, &terminal_width, NULL);
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if (--terminal_width > MAX_WIDTH)
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terminal_width = MAX_WIDTH;
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}
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format_header();
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p = NULL;
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while ((p = procps_scan(p, need_flags))) {
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format_process(p);
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}
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return EXIT_SUCCESS;
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}
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#else /* !ENABLE_DESKTOP */
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int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ps_main(int argc, char **argv)
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{
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procps_status_t *p = NULL;
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int len;
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SKIP_SELINUX(const) int use_selinux = 0;
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USE_SELINUX(int i;)
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#if !ENABLE_FEATURE_PS_WIDE
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enum { terminal_width = 79 };
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#else
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int terminal_width;
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int w_count = 0;
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#endif
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#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
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#if ENABLE_FEATURE_PS_WIDE
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opt_complementary = "-:ww";
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USE_SELINUX(i =) getopt32(argv, USE_SELINUX("Z") "w", &w_count);
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/* if w is given once, GNU ps sets the width to 132,
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* if w is given more than once, it is "unlimited"
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*/
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if (w_count) {
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terminal_width = (w_count==1) ? 132 : MAX_WIDTH;
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} else {
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get_terminal_width_height(0, &terminal_width, NULL);
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/* Go one less... */
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if (--terminal_width > MAX_WIDTH)
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terminal_width = MAX_WIDTH;
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}
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#else /* only ENABLE_SELINUX */
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i = getopt32(argv, "Z");
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#endif
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#if ENABLE_SELINUX
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if ((i & 1) && is_selinux_enabled())
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use_selinux = PSSCAN_CONTEXT;
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#endif
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#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
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if (use_selinux)
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puts(" PID Context Stat Command");
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else
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puts(" PID Uid VSZ Stat Command");
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while ((p = procps_scan(p, 0
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| PSSCAN_PID
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| PSSCAN_UIDGID
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| PSSCAN_STATE
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| PSSCAN_VSZ
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| PSSCAN_COMM
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| use_selinux
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))) {
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#if ENABLE_SELINUX
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if (use_selinux) {
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len = printf("%5u %-32s %s ",
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p->pid,
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p->context ? p->context : "unknown",
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p->state);
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} else
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#endif
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{
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const char *user = get_cached_username(p->uid);
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if (p->vsz == 0)
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len = printf("%5u %-8s %s ",
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p->pid, user, p->state);
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else
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len = printf("%5u %-8s %6lu %s ",
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p->pid, user, p->vsz, p->state);
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}
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{
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int sz = terminal_width - len;
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char buf[sz + 1];
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read_cmdline(buf, sz, p->pid, p->comm);
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puts(buf);
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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clear_username_cache();
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return EXIT_SUCCESS;
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}
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#endif /* ENABLE_DESKTOP */
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