procps/pgrep.c

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2002-02-02 04:17:29 +05:30
/* emacs settings: -*- c-basic-offset: 8 tab-width: 8 -*-
*
* pgrep/pkill -- utilities to filter the process table
*
* Copyright 2000 Kjetil Torgrim Homme <kjetilho@ifi.uio.no>
*
* May be distributed under the conditions of the
* GNU General Public License; a copy is in COPYING
*
* Changes by Albert Cahalan, 2002,2006.
*
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*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
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#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <regex.h>
#include <errno.h>
#include "proc/readproc.h"
#include "proc/sig.h"
#include "proc/devname.h"
#include "proc/sysinfo.h"
#include "proc/version.h" /* procps_version */
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// EXIT_SUCCESS is 0
// EXIT_FAILURE is 1
#define EXIT_USAGE 2
#define EXIT_FATAL 3
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static int i_am_pkill = 0;
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static const char *progname = "pgrep";
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union el {
long num;
char * str;
};
/* User supplied arguments */
static int opt_full = 0;
static int opt_long = 0;
static int opt_oldest = 0;
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static int opt_newest = 0;
static int opt_negate = 0;
static int opt_exact = 0;
static int opt_count = 0;
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static int opt_signal = SIGTERM;
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static int opt_lock = 0;
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static int opt_case = 0;
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static const char *opt_delim = "\n";
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static union el *opt_pgrp = NULL;
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static union el *opt_rgid = NULL;
static union el *opt_pid = NULL;
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static union el *opt_ppid = NULL;
static union el *opt_sid = NULL;
static union el *opt_term = NULL;
static union el *opt_euid = NULL;
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static union el *opt_ruid = NULL;
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static char *opt_pattern = NULL;
static char *opt_pidfile = NULL;
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static int usage (int opt) NORETURN;
static int usage (int opt)
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{
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int err = (opt=='?'); /* getopt() uses '?' to mark an error */
FILE *fp = err ? stderr : stdout;
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if (i_am_pkill)
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fprintf (fp, "Usage: pkill [-SIGNAL] [-fvx] ");
else
fprintf (fp, "Usage: pgrep [-cflvx] [-d DELIM] ");
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fprintf (fp, "[-n|-o] [-P PPIDLIST] [-g PGRPLIST] [-s SIDLIST]\n"
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"\t[-u EUIDLIST] [-U UIDLIST] [-G GIDLIST] [-t TERMLIST] "
"[PATTERN]\n");
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exit(err ? EXIT_USAGE : EXIT_SUCCESS);
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}
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static union el *split_list (const char *restrict str, int (*convert)(const char *, union el *))
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{
char *copy = strdup (str);
char *ptr = copy;
char *sep_pos;
int i = 0;
int size = 0;
union el *list = NULL;
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do {
if (i == size) {
size = size * 5 / 4 + 4;
// add 1 because slot zero is a count
list = realloc (list, 1 + size * sizeof *list);
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if (list == NULL)
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exit (EXIT_FATAL);
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}
sep_pos = strchr (ptr, ',');
if (sep_pos)
*sep_pos = 0;
// Use ++i instead of i++ because slot zero is a count
if (!convert (ptr, &list[++i]))
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exit (EXIT_USAGE);
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if (sep_pos)
ptr = sep_pos + 1;
} while (sep_pos);
free (copy);
if (!i) {
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free (list);
list = NULL;
} else {
list[0].num = i;
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}
return list;
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}
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// strict_atol returns a Boolean: TRUE if the input string
// contains a plain number, FALSE if there are any non-digits.
static int strict_atol (const char *restrict str, long *restrict value)
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{
int res = 0;
int sign = 1;
if (*str == '+')
++str;
else if (*str == '-') {
++str;
sign = -1;
}
for ( ; *str; ++str) {
if (! isdigit (*str))
return (0);
res *= 10;
res += *str - '0';
}
*value = sign * res;
return 1;
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}
#include <sys/file.h>
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// Seen non-BSD code do this:
//
//if (fcntl_lock(pid_fd, F_SETLK, F_WRLCK, SEEK_SET, 0, 0) == -1)
// return -1;
int fcntl_lock(int fd, int cmd, int type, int whence, int start, int len)
{
struct flock lock[1];
lock->l_type = type;
lock->l_whence = whence;
lock->l_start = start;
lock->l_len = len;
return fcntl(fd, cmd, lock);
}
// We try a read lock. The daemon should have a write lock.
// Seen using flock: FreeBSD code
static int has_flock(int fd)
{
return flock(fd, LOCK_SH|LOCK_NB)==-1 && errno==EWOULDBLOCK;
}
// We try a read lock. The daemon should have a write lock.
// Seen using fcntl: libslack
static int has_fcntl(int fd)
{
struct flock f; // seriously, struct flock is for a fnctl lock!
f.l_type = F_RDLCK;
f.l_whence = SEEK_SET;
f.l_start = 0;
f.l_len = 0;
return fcntl(fd,F_SETLK,&f)==-1 && (errno==EACCES || errno==EAGAIN);
}
static union el *read_pidfile(void)
{
char buf[12];
int fd;
struct stat sbuf;
char *endp;
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int n, pid;
union el *list = NULL;
fd = open(opt_pidfile, O_RDONLY|O_NOCTTY|O_NONBLOCK);
if(fd<0)
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goto just_ret;
if(fstat(fd,&sbuf) || !S_ISREG(sbuf.st_mode) || sbuf.st_size<1)
goto out;
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// type of lock, if any, is not standardized on Linux
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if(opt_lock && !has_flock(fd) && !has_fcntl(fd))
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goto out;
memset(buf,'\0',sizeof buf);
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n = read(fd,buf+1,sizeof buf-2);
if (n<1)
goto out;
buf[n] = '\0';
pid = strtoul(buf+1,&endp,10);
if(endp<=buf+1 || pid<1 || pid>0x7fffffff)
goto out;
if(*endp && !isspace(*endp))
goto out;
list = malloc(2 * sizeof *list);
list[0].num = 1;
list[1].num = pid;
out:
close(fd);
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just_ret:
return list;
}
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static int conv_uid (const char *restrict name, union el *restrict e)
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{
struct passwd *pwd;
if (strict_atol (name, &e->num))
return (1);
pwd = getpwnam (name);
if (pwd == NULL) {
fprintf (stderr, "%s: invalid user name: %s\n",
progname, name);
return 0;
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}
e->num = pwd->pw_uid;
return 1;
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}
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static int conv_gid (const char *restrict name, union el *restrict e)
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{
struct group *grp;
if (strict_atol (name, &e->num))
return 1;
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grp = getgrnam (name);
if (grp == NULL) {
fprintf (stderr, "%s: invalid group name: %s\n",
progname, name);
return 0;
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}
e->num = grp->gr_gid;
return 1;
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}
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static int conv_pgrp (const char *restrict name, union el *restrict e)
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{
if (! strict_atol (name, &e->num)) {
fprintf (stderr, "%s: invalid process group: %s\n",
progname, name);
return 0;
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}
if (e->num == 0)
e->num = getpgrp ();
return 1;
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}
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static int conv_sid (const char *restrict name, union el *restrict e)
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{
if (! strict_atol (name, &e->num)) {
fprintf (stderr, "%s: invalid session id: %s\n",
progname, name);
return 0;
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}
if (e->num == 0)
e->num = getsid (0);
return 1;
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}
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static int conv_num (const char *restrict name, union el *restrict e)
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{
if (! strict_atol (name, &e->num)) {
fprintf (stderr, "%s: not a number: %s\n",
progname, name);
return 0;
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}
return 1;
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}
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static int conv_str (const char *restrict name, union el *restrict e)
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{
e->str = strdup (name);
return 1;
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}
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static int match_numlist (long value, const union el *restrict list)
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{
int found = 0;
if (list == NULL)
found = 0;
else {
int i;
for (i = list[0].num; i > 0; i--) {
if (list[i].num == value)
found = 1;
}
}
return found;
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}
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static int match_strlist (const char *restrict value, const union el *restrict list)
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{
int found = 0;
if (list == NULL)
found = 0;
else {
int i;
for (i = list[0].num; i > 0; i--) {
if (! strcmp (list[i].str, value))
found = 1;
}
}
return found;
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}
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static void output_numlist (const union el *restrict list, int num)
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{
int i;
const char *delim = opt_delim;
for (i = 0; i < num; i++) {
if(i+1==num)
delim = "\n";
printf ("%ld%s", list[i].num, delim);
}
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}
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static void output_strlist (const union el *restrict list, int num)
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{
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// FIXME: escape codes
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int i;
const char *delim = opt_delim;
for (i = 0; i < num; i++) {
if(i+1==num)
delim = "\n";
printf ("%s%s", list[i].str, delim);
}
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}
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static PROCTAB *do_openproc (void)
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{
PROCTAB *ptp;
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int flags = 0;
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if (opt_pattern || opt_full)
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flags |= PROC_FILLCOM;
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if (opt_ruid || opt_rgid)
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flags |= PROC_FILLSTATUS;
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if (opt_oldest || opt_newest || opt_pgrp || opt_sid || opt_term)
flags |= PROC_FILLSTAT;
if (!(flags & PROC_FILLSTAT))
flags |= PROC_FILLSTATUS; // FIXME: need one, and PROC_FILLANY broken
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if (opt_euid && !opt_negate) {
int num = opt_euid[0].num;
int i = num;
uid_t *uids = malloc (num * sizeof (uid_t));
if (uids == NULL)
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exit (EXIT_FATAL);
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while (i-- > 0) {
uids[i] = opt_euid[i+1].num;
}
flags |= PROC_UID;
ptp = openproc (flags, uids, num);
} else {
ptp = openproc (flags);
}
return ptp;
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}
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static regex_t * do_regcomp (void)
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{
regex_t *preg = NULL;
if (opt_pattern) {
char *re;
char errbuf[256];
int re_err;
preg = malloc (sizeof (regex_t));
if (preg == NULL)
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exit (EXIT_FATAL);
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if (opt_exact) {
re = malloc (strlen (opt_pattern) + 5);
if (re == NULL)
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exit (EXIT_FATAL);
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sprintf (re, "^(%s)$", opt_pattern);
} else {
re = opt_pattern;
}
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re_err = regcomp (preg, re, REG_EXTENDED | REG_NOSUB | opt_case);
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if (re_err) {
regerror (re_err, preg, errbuf, sizeof(errbuf));
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fputs(errbuf,stderr);
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exit (EXIT_USAGE);
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}
}
return preg;
}
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static union el * select_procs (int *num)
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{
PROCTAB *ptp;
proc_t task;
unsigned long long saved_start_time; // for new/old support
pid_t saved_pid = 0; // for new/old support
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int matches = 0;
int size = 0;
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regex_t *preg;
pid_t myself = getpid();
union el *list = NULL;
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char cmd[4096];
ptp = do_openproc();
preg = do_regcomp();
if (opt_newest) saved_start_time = 0ULL;
else saved_start_time = ~0ULL;
if (opt_newest) saved_pid = 0;
if (opt_oldest) saved_pid = INT_MAX;
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memset(&task, 0, sizeof (task));
while(readproc(ptp, &task)) {
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int match = 1;
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if (task.XXXID == myself)
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continue;
else if (opt_newest && task.start_time < saved_start_time)
match = 0;
else if (opt_oldest && task.start_time > saved_start_time)
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match = 0;
else if (opt_ppid && ! match_numlist (task.ppid, opt_ppid))
match = 0;
else if (opt_pid && ! match_numlist (task.tgid, opt_pid))
match = 0;
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else if (opt_pgrp && ! match_numlist (task.pgrp, opt_pgrp))
match = 0;
else if (opt_euid && ! match_numlist (task.euid, opt_euid))
match = 0;
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else if (opt_ruid && ! match_numlist (task.ruid, opt_ruid))
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match = 0;
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else if (opt_rgid && ! match_numlist (task.rgid, opt_rgid))
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match = 0;
else if (opt_sid && ! match_numlist (task.session, opt_sid))
match = 0;
else if (opt_term) {
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if (task.tty == 0) {
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match = 0;
} else {
char tty[256];
dev_to_tty (tty, sizeof(tty) - 1,
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task.tty, task.XXXID, ABBREV_DEV);
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match = match_strlist (tty, opt_term);
}
}
if (opt_long || (match && opt_pattern)) {
if (opt_full && task.cmdline) {
int i = 0;
int bytes = sizeof (cmd) - 1;
/* make sure it is always NUL-terminated */
cmd[bytes] = 0;
/* make room for SPC in loop below */
--bytes;
strncpy (cmd, task.cmdline[i], bytes);
bytes -= strlen (task.cmdline[i++]);
while (task.cmdline[i] && bytes > 0) {
strncat (cmd, " ", bytes);
strncat (cmd, task.cmdline[i], bytes);
bytes -= strlen (task.cmdline[i++]) + 1;
}
} else {
strcpy (cmd, task.cmd);
}
}
if (match && opt_pattern) {
if (regexec (preg, cmd, 0, NULL, 0) != 0)
match = 0;
}
if (match ^ opt_negate) { /* Exclusive OR is neat */
if (opt_newest) {
if (saved_start_time == task.start_time &&
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saved_pid > task.XXXID)
continue;
saved_start_time = task.start_time;
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saved_pid = task.XXXID;
matches = 0;
}
if (opt_oldest) {
if (saved_start_time == task.start_time &&
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saved_pid < task.XXXID)
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continue;
saved_start_time = task.start_time;
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saved_pid = task.XXXID;
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matches = 0;
}
if (matches == size) {
size = size * 5 / 4 + 4;
list = realloc(list, size * sizeof *list);
if (list == NULL)
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exit (EXIT_FATAL);
}
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if (opt_long) {
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char buff[5096]; // FIXME
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sprintf (buff, "%d %s", task.XXXID, cmd);
list[matches++].str = strdup (buff);
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} else {
list[matches++].num = task.XXXID;
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}
}
memset (&task, 0, sizeof (task));
}
closeproc (ptp);
*num = matches;
return list;
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}
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static void parse_opts (int argc, char **argv)
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{
char opts[32] = "";
int opt;
int criteria_count = 0;
if (strstr (argv[0], "pkill")) {
i_am_pkill = 1;
progname = "pkill";
/* Look for a signal name or number as first argument */
if (argc > 1 && argv[1][0] == '-') {
int sig;
sig = signal_name_to_number (argv[1] + 1);
if (sig == -1 && isdigit (argv[1][1]))
sig = atoi (argv[1] + 1);
if (sig != -1) {
int i;
for (i = 2; i < argc; i++)
argv[i-1] = argv[i];
--argc;
opt_signal = sig;
}
}
} else {
/* These options are for pgrep only */
strcat (opts, "ld:");
}
strcat (opts, "LF:cfnovxP:g:s:u:U:G:t:?V");
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while ((opt = getopt (argc, argv, opts)) != -1) {
switch (opt) {
// case 'D': // FreeBSD: print info about non-matches for debugging
// break;
case 'F': // FreeBSD: the arg is a file containing a PID to match
opt_pidfile = strdup (optarg);
++criteria_count;
break;
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case 'G': // Solaris: match rgid/rgroup
opt_rgid = split_list (optarg, conv_gid);
if (opt_rgid == NULL)
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usage (opt);
++criteria_count;
break;
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// case 'I': // FreeBSD: require confirmation before killing
// break;
// case 'J': // Solaris: match by project ID (name or number)
// break;
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case 'L': // FreeBSD: fail if pidfile (see -F) not locked
opt_lock++;
break;
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// case 'M': // FreeBSD: specify core (OS crash dump) file
// break;
// case 'N': // FreeBSD: specify alternate namelist file (for us, System.map -- but we don't need it)
// break;
case 'P': // Solaris: match by PPID
opt_ppid = split_list (optarg, conv_num);
if (opt_ppid == NULL)
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usage (opt);
++criteria_count;
break;
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// case 'S': // FreeBSD: don't ignore the built-in kernel tasks
// break;
// case 'T': // Solaris: match by "task ID" (probably not a Linux task)
// break;
case 'U': // Solaris: match by ruid/rgroup
opt_ruid = split_list (optarg, conv_uid);
if (opt_ruid == NULL)
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usage (opt);
++criteria_count;
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break;
case 'V':
fprintf(stdout, "%s (%s)\n", progname, procps_version);
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exit(EXIT_SUCCESS);
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// case 'c': // Solaris: match by contract ID
// break;
case 'c':
opt_count = 1;
break;
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case 'd': // Solaris: change the delimiter
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opt_delim = strdup (optarg);
break;
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case 'f': // Solaris: match full process name (as in "ps -f")
opt_full = 1;
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break;
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case 'g': // Solaris: match pgrp
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opt_pgrp = split_list (optarg, conv_pgrp);
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if (opt_pgrp == NULL)
usage (opt);
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++criteria_count;
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break;
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// case 'i': // FreeBSD: ignore case. OpenBSD: withdrawn. See -I. This sucks.
// if (opt_case)
// usage (opt);
// opt_case = REG_ICASE;
// break;
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// case 'j': // FreeBSD: restricted to the given jail ID
// break;
case 'l': // Solaris: long output format (pgrep only) Should require -f for beyond argv[0] maybe?
opt_long = 1;
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break;
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case 'n': // Solaris: match only the newest
if (opt_oldest|opt_negate|opt_newest)
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usage (opt);
opt_newest = 1;
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++criteria_count;
break;
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case 'o': // Solaris: match only the oldest
if (opt_oldest|opt_negate|opt_newest)
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usage (opt);
opt_oldest = 1;
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++criteria_count;
break;
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case 's': // Solaris: match by session ID -- zero means self
opt_sid = split_list (optarg, conv_sid);
if (opt_sid == NULL)
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usage (opt);
++criteria_count;
break;
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case 't': // Solaris: match by tty
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opt_term = split_list (optarg, conv_str);
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if (opt_term == NULL)
usage (opt);
++criteria_count;
break;
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case 'u': // Solaris: match by euid/egroup
opt_euid = split_list (optarg, conv_uid);
if (opt_euid == NULL)
usage (opt);
++criteria_count;
break;
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case 'v': // Solaris: as in grep, invert the matching (uh... applied after selection I think)
if (opt_oldest|opt_negate|opt_newest)
usage (opt);
opt_negate = 1;
break;
// OpenBSD -x, being broken, does a plain string
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case 'x': // Solaris: use ^(regexp)$ in place of regexp (FreeBSD too)
opt_exact = 1;
break;
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// case 'z': // Solaris: match by zone ID
// break;
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case '?':
usage (opt);
break;
}
}
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if(opt_lock && !opt_pidfile){
fprintf(stderr, "%s: -L without -F makes no sense\n",progname);
usage(0);
}
if(opt_pidfile){
opt_pid = read_pidfile();
if(!opt_pid){
fprintf(stderr, "%s: pidfile not valid\n",progname);
usage(0);
}
}
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if (argc - optind == 1)
opt_pattern = argv[optind];
else if (argc - optind > 1)
usage (0);
else if (criteria_count == 0) {
fprintf (stderr, "%s: No matching criteria specified\n",
progname);
usage (0);
}
}
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int main (int argc, char *argv[])
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{
union el *procs;
int num;
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parse_opts (argc, argv);
procs = select_procs (&num);
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if (i_am_pkill) {
int i;
for (i = 0; i < num; i++) {
if (kill (procs[i].num, opt_signal) != -1) continue;
if (errno==ESRCH) continue; // gone now, which is OK
fprintf (stderr, "pkill: %ld - %s\n",
procs[i].num, strerror (errno));
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}
} else {
if (opt_count) {
fprintf(stdout, "%ld\n", num);
} else {
if (opt_long)
output_strlist (procs,num);
else
output_numlist (procs,num);
}
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}
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return !num; // exit(EXIT_SUCCESS) if match, otherwise exit(EXIT_FAILURE)
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}