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busybox/procps/ps.c

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C
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/* 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"
#if ENABLE_DESKTOP
/* Print value to buf, max size+1 chars (including trailing '\0') */
static void func_user(char *buf, int size, const procps_status_t *ps)
{
safe_strncpy(buf, get_cached_username(ps->uid), 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, 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_u(char *buf, int size, unsigned u)
{
char buf5[5];
smart_ulltoa5( ((unsigned long long)u) << 10, buf5);
sprintf(buf, "%.*s", size, buf5);
}
static void func_vsz(char *buf, int size, const procps_status_t *ps)
{
put_u(buf, size, ps->vsz);
}
static void func_rss(char *buf, int size, const procps_status_t *ps)
{
put_u(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_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_etime(char *buf, int size, const procps_status_t *ps)
{
elapled time [[dd-]hh:]mm:ss
}
static void func_time(char *buf, int size, const procps_status_t *ps)
{
cumulative time [[dd-]hh:]mm:ss
}
static void func_pcpu(char *buf, int size, const procps_status_t *ps)
{
}
*/
typedef struct {
uint16_t width;
char name[6];
const char *header;
void (*f)(char *buf, int size, const procps_status_t *ps);
int ps_flags;
} ps_out_t;
static const ps_out_t out_spec[] = {
// Mandated by POSIX:
{ 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
{ 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
{ 256 , "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 },
// { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_ },
// { sizeof("GROUP" )-1, "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
// { sizeof("NI" )-1, "nice" ,"NI" ,func_nice ,PSSCAN_ },
// { sizeof("%CPU" )-1, "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
// { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID },
// { sizeof("RUSER" )-1, "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID },
// { sizeof("TIME" )-1, "time" ,"TIME" ,func_time ,PSSCAN_ },
{ 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
};
#if ENABLE_SELINUX
#define SELINIX_O_PREFIX "label,"
#define DEFAULT_O_STR SELINIX_O_PREFIX "pid,user" /* TODO: ,vsz,stat */ ",args"
#else
#define DEFAULT_O_STR "pid,user" /* TODO: ,vsz,stat */ ",args"
#endif
struct globals {
ps_out_t* out;
int out_cnt;
int print_header;
int need_flags;
char *buffer;
unsigned terminal_width;
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 default_o (G.default_o )
static ps_out_t* new_out_t(void)
{
int i = out_cnt++;
out = xrealloc(out, out_cnt * sizeof(*out));
return &out[i];
}
static const ps_out_t* find_out_spec(const char *name)
{
int i;
for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
if (!strcmp(name, out_spec[i].name))
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 post_process(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 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);
int ps_main(int argc, char **argv)
{
procps_status_t *p;
llist_t* opt_o = NULL;
USE_SELINUX(int opt;)
// 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 */
opt_complementary = "o::";
USE_SELINUX(opt =) getopt32(argc, argv, "Zo:aAdefl", &opt_o);
if (opt_o) {
do {
parse_o(opt_o->data);
opt_o = opt_o->link;
} while (opt_o);
} else {
/* Below: parse_o() needs char*, NOT const char*... */
#if ENABLE_SELINUX
if (!(opt & 1) || !is_selinux_enabled()) {
/* no -Z or no SELinux: do not show LABEL */
strcpy(default_o, DEFAULT_O_STR + sizeof(SELINIX_O_PREFIX)-1);
} else
#endif
{
strcpy(default_o, DEFAULT_O_STR);
}
parse_o(default_o);
}
post_process();
/* Was INT_MAX, but some libc's go belly up with printf("%.*s")
* and such large widths */
terminal_width = 30000;
if (isatty(1)) {
get_terminal_width_height(1, &terminal_width, NULL);
terminal_width--;
}
format_header();
p = NULL;
while ((p = procps_scan(p, need_flags))) {
format_process(p);
}
return EXIT_SUCCESS;
}
#else /* !ENABLE_DESKTOP */
int ps_main(int argc, char **argv);
int ps_main(int argc, char **argv)
{
procps_status_t *p = NULL;
int len;
SKIP_SELINUX(const) int use_selinux = 0;
USE_SELINUX(int i;)
#if !ENABLE_FEATURE_PS_WIDE
enum { terminal_width = 79 };
#else
int terminal_width;
int w_count = 0;
#endif
#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
#if ENABLE_FEATURE_PS_WIDE
opt_complementary = "-:ww";
USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("Z") "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 : INT_MAX;
} else {
get_terminal_width_height(1, &terminal_width, NULL);
/* Go one less... */
terminal_width--;
}
#else /* only ENABLE_SELINUX */
i = getopt32(argc, argv, "Z");
#endif
#if ENABLE_SELINUX
if (i && is_selinux_enabled())
use_selinux = PSSCAN_CONTEXT;
#endif
#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
if (use_selinux)
puts(" PID Context Stat Command");
else
puts(" PID Uid VSZ Stat Command");
while ((p = procps_scan(p, 0
| PSSCAN_PID
| PSSCAN_UIDGID
| PSSCAN_STATE
| PSSCAN_VSZ
| PSSCAN_COMM
| use_selinux
))) {
#if ENABLE_SELINUX
if (use_selinux) {
len = printf("%5u %-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 %-8s %s ",
p->pid, user, p->state);
else
len = printf("%5u %-8s %6u %s ",
p->pid, user, p->vsz, 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 */
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