busybox/procps/ps.c

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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>
*
* Licensed under the GPL version 2, see the file LICENSE in this tarball.
*/
#include "busybox.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)
{
buf[0] = '\0';
if (ps->cmd)
safe_strncpy(buf, ps->cmd, size+1);
else if (size >= 2)
snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
}
static void func_pid(char *buf, int size, const procps_status_t *ps)
{
snprintf(buf, size+1, "%*u", size, ps->pid);
}
static void func_ppid(char *buf, int size, const procps_status_t *ps)
{
snprintf(buf, size+1, "%*u", size, ps->ppid);
}
static void func_pgid(char *buf, int size, const procps_status_t *ps)
{
snprintf(buf, size+1, "%*u", size, ps->pgid);
}
static void func_vsz(char *buf, int size, const procps_status_t *ps)
{
char buf5[5];
smart_ulltoa5( ((unsigned long long)ps->vsz) << 10, buf5);
snprintf(buf, size+1, "%.*s", size, buf5);
}
/*
void func_nice(char *buf, int size, const procps_status_t *ps)
{
ps->???
}
void func_etime(char *buf, int size, const procps_status_t *ps)
{
elapled time [[dd-]hh:]mm:ss
}
void func_time(char *buf, int size, const procps_status_t *ps)
{
cumulative time [[dd-]hh:]mm:ss
}
void func_pcpu(char *buf, int size, const procps_status_t *ps)
{
}
void func_tty(char *buf, int size, const procps_status_t *ps)
{
}
*/
typedef struct {
char name[8];
const char *header;
void (*f)(char *buf, int size, const procps_status_t *ps);
int ps_flags;
int width;
} ps_out_t;
static const ps_out_t out_spec[] = {
// Mandated by POSIX:
{ "user" ,"USER" ,func_user ,PSSCAN_UIDGID,8 },
{ "comm" ,"COMMAND",func_comm ,PSSCAN_COMM ,16 },
{ "args" ,"COMMAND",func_args ,PSSCAN_CMD|PSSCAN_COMM,256 },
{ "pid" ,"PID" ,func_pid ,PSSCAN_PID ,5 },
{ "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID ,5 },
{ "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID ,5 },
// { "etime" ,"ELAPSED",func_etime ,PSSCAN_ ,sizeof("ELAPSED")-1 },
// { "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID,sizeof("GROUP" )-1 },
// { "nice" ,"NI" ,func_nice ,PSSCAN_ ,sizeof("NI" )-1 },
// { "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ ,sizeof("%CPU" )-1 },
// { "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
// { "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER" )-1 },
// { "time" ,"TIME" ,func_time ,PSSCAN_ ,sizeof("TIME" )-1 },
// { "tty" ,"TT" ,func_tty ,PSSCAN_ ,sizeof("TT" )-1 },
{ "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ ,4 },
// Not mandated by POSIX:
// { "rss" ,"RSS" ,func_rss ,PSSCAN_RSS ,4 },
};
#define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )
static ps_out_t* out;
static int out_cnt;
static int print_header;
static int ps_flags;
static char *buffer;
static unsigned terminal_width;
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 < VEC_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;
}
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++) {
ps_flags |= out[i].ps_flags;
if (out[i].header[0]) {
print_header = 1;
}
width += out[i].width + 1; /* "FIELD " */
}
buffer = xmalloc(width + 1); /* for trailing \0 */
}
static void format_header(void)
{
int i;
ps_out_t* op;
char *p = buffer;
if (!print_header)
return;
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.
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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;
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p += sprintf(p, "%*s", len, "");
}
printf("%.*s\n", terminal_width, buffer);
}
/* Cannot be const: parse_o() will choke */
static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";
int ps_main(int argc, char **argv);
int ps_main(int argc, char **argv)
{
procps_status_t *p;
llist_t* opt_o = NULL;
// 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 distplay
/* We allow (and ignore) most of the above. FIXME */
opt_complementary = "o::";
getopt32(argc, argv, "o:aAdefl", &opt_o);
if (opt_o) {
opt_o = llist_rev(opt_o);
do {
parse_o(opt_o->data);
opt_o = opt_o->link;
} while (opt_o);
} else
parse_o(default_o);
post_process();
terminal_width = INT_MAX;
if (isatty(1)) {
get_terminal_width_height(1, &terminal_width, NULL);
terminal_width--;
}
format_header();
p = NULL;
while ((p = procps_scan(p, ps_flags))) {
format_process(p);
}
return EXIT_SUCCESS;
}
#else /* !ENABLE_DESKTOP */
int ps_main(int argc, char **argv);
int ps_main(int argc, char **argv)
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{
procps_status_t *p = NULL;
int i, len;
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SKIP_SELINUX(const) int use_selinux = 0;
USE_SELINUX(security_context_t sid = NULL;)
#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
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opt_complementary = "-:ww";
USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("c") "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--;
}
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#else /* only ENABLE_SELINUX */
i = getopt32(argc, argv, "c");
#endif
#if ENABLE_SELINUX
if ((i & 1) && is_selinux_enabled())
use_selinux = 1;
#endif
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#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_CMD
))) {
char *namecmd = p->cmd;
#if ENABLE_SELINUX
if (use_selinux) {
char sbuf[128];
len = sizeof(sbuf);
if (is_selinux_enabled()) {
if (getpidcon(p->pid, &sid) < 0)
sid = NULL;
}
if (sid) {
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/* I assume sid initialized with NULL */
len = strlen(sid) + 1;
safe_strncpy(sbuf, sid, len);
freecon(sid);
sid = NULL;
} else {
safe_strncpy(sbuf, "unknown", 7);
}
len = printf("%5u %-32s %s ", p->pid, sbuf, p->state);
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} 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 %6ld %s ",
p->pid, user, p->vsz, p->state);
}
i = terminal_width-len;
if (namecmd && namecmd[0]) {
if (i < 0)
i = 0;
if (strlen(namecmd) > (size_t)i)
namecmd[i] = 0;
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puts(namecmd);
} else {
namecmd = p->comm;
if (i < 2)
i = 2;
if (strlen(namecmd) > ((size_t)i-2))
namecmd[i-2] = 0;
printf("[%s]\n", namecmd);
}
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}
if (ENABLE_FEATURE_CLEAN_UP)
clear_username_cache();
return EXIT_SUCCESS;
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}
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#endif /* ENABLE_DESKTOP */