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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2006 William Jon McCann <mccann@jhu.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#define DEV_ENCODE(M,m) ( \
( (M&0xfff) << 8) | ( (m&0xfff00) << 12) | (m&0xff) \
)
#include <sys/int_types.h>
#include <sys/mkdev.h>
#define _STRUCTURED_PROC 1
#include <sys/procfs.h>
#define NO_TTY_VALUE DEV_ENCODE(-1,-1)
#include "proc.h"
/* adapted from procps */
struct _proc_stat_t
{
int pid;
int ppid; /* stat,status pid of parent process */
char state; /* stat,status single-char code for process state (S=sleeping) */
char cmd[16]; /* stat,status basename of executable file in call to exec(2) */
unsigned long long utime; /* stat user-mode CPU time accumulated by process */
unsigned long long stime; /* stat kernel-mode CPU time accumulated by process */
unsigned long long cutime; /* stat cumulative utime of process and reaped children */
unsigned long long cstime; /* stat cumulative stime of process and reaped children */
unsigned long long start_time; /* stat start time of process -- seconds since 1-1-70 */
unsigned long start_code; /* stat address of beginning of code segment */
unsigned long end_code; /* stat address of end of code segment */
unsigned long start_stack; /* stat address of the bottom of stack for the process */
unsigned long kstk_esp; /* stat kernel stack pointer */
unsigned long kstk_eip; /* stat kernel instruction pointer */
unsigned long wchan; /* stat (special) address of kernel wait channel proc is sleeping in */
long priority; /* stat kernel scheduling priority */
long nice; /* stat standard unix nice level of process */
long rss; /* stat resident set size from /proc/#/stat (pages) */
long alarm; /* stat ? */
unsigned long rtprio; /* stat real-time priority */
unsigned long sched; /* stat scheduling class */
unsigned long vsize; /* stat number of pages of virtual memory ... */
unsigned long rss_rlim; /* stat resident set size limit? */
unsigned long flags; /* stat kernel flags for the process */
unsigned long min_flt; /* stat number of minor page faults since process start */
unsigned long maj_flt; /* stat number of major page faults since process start */
unsigned long cmin_flt; /* stat cumulative min_flt of process and child processes */
unsigned long cmaj_flt; /* stat cumulative maj_flt of process and child processes */
int pgrp; /* stat process group id */
int session; /* stat session id */
int nlwp; /* stat number of threads, or 0 if no clue */
int tty; /* stat full device number of controlling terminal */
int tpgid; /* stat terminal process group id */
int exit_signal; /* stat might not be SIGCHLD */
int processor; /* stat current (or most recent?) CPU */
uintptr_t penv; /* stat address of initial environment vector */
char tty_text[16]; /* stat device name */
};
pid_t
proc_stat_get_ppid (proc_stat_t *stat)
{
g_return_val_if_fail (stat != NULL, -1);
return stat->ppid;
}
char *
proc_stat_get_cmd (proc_stat_t *stat)
{
g_return_val_if_fail (stat != NULL, NULL);
return g_strdup (stat->cmd);
}
/* adapted from procps */
char *
proc_stat_get_tty (proc_stat_t *stat)
{
guint dev;
char *tty;
guint dev_maj;
guint dev_min;
pid_t pid;
g_return_val_if_fail (stat != NULL, NULL);
return stat->tty_text;
}
/* return 1 if it works, or 0 for failure */
static gboolean
stat2proc (pid_t pid,
proc_stat_t *P)
{
struct psinfo p;
char buf[32];
int num;
int fd;
int tty_maj;
int tty_min;
snprintf (buf, sizeof buf, "/proc/%d/psinfo", pid);
if ((fd = open (buf, O_RDONLY, 0) ) == -1 ) {
return FALSE;
}
num = read (fd, &p, sizeof p);
close (fd);
if (num != sizeof p) {
return FALSE;
}
num = PRFNSZ;
if (num >= sizeof P->cmd) {
num = sizeof P->cmd - 1;
}
memcpy (P->cmd, p.pr_fname, num); /* p.pr_fname or p.pr_lwp.pr_name */
P->cmd[num] = '\0';
P->pid = p.pr_pid;
P->ppid = p.pr_ppid;
P->pgrp = p.pr_pgid;
P->session = p.pr_sid;
P->rss = p.pr_rssize;
P->vsize = p.pr_size;
P->start_time = p.pr_start.tv_sec;
P->wchan = p.pr_lwp.pr_wchan;
P->state = p.pr_lwp.pr_sname;
P->nice = p.pr_lwp.pr_nice;
P->priority = p.pr_lwp.pr_pri; /* or pr_oldpri */
P->penv = p.pr_envp;
/* we like it Linux-encoded :-) */
tty_maj = major (p.pr_ttydev);
tty_min = minor (p.pr_ttydev);
P->tty = DEV_ENCODE (tty_maj,tty_min);
snprintf (P->tty_text, sizeof P->tty_text, "%3d,%-3d", tty_maj, tty_min);
if (tty_maj == 24) {
snprintf (P->tty_text, sizeof P->tty_text, "pts/%-3u", tty_min);
}
if (P->tty == NO_TTY_VALUE) {
memcpy (P->tty_text, " ? ", 8);
}
if (P->tty == DEV_ENCODE(0,0)) {
memcpy (P->tty_text, "console", 8);
}
if (P->pid != pid) {
return FALSE;
}
return TRUE;
}
gboolean
proc_stat_new_for_pid (pid_t pid,
proc_stat_t **stat,
GError **error)
{
char *path;
char *contents;
gsize length;
gboolean res;
GError *local_error;
proc_stat_t *proc;
g_return_val_if_fail (pid > 1, FALSE);
if (stat == NULL) {
return FALSE;
}
proc = g_new0 (proc_stat_t, 1);
proc->pid = pid;
res = stat2proc (pid, proc);
if (res) {
*stat = proc;
} else {
g_propagate_error (error, local_error);
*stat = NULL;
}
return res;
}
void
proc_stat_free (proc_stat_t *stat)
{
g_free (stat);
}
GHashTable *
proc_pid_get_env_hash (pid_t pid)
{
GHashTable *hash;
gboolean res;
proc_stat_t *stat;
char *env[400];
char buf[BUFSIZ];
int fd;
int i;
res = proc_stat_new_for_pid (pid, &stat, NULL);
if (! res) {
goto out;
}
hash = NULL;
hash = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
g_free);
pread (fd, env, 400, stat->penv);
i = 0;
while (env[i] != NULL && i < 400) {
char **vals;
pread (fd, buf, BUFSIZ, env[i++]);
vals = g_strsplit (buf, "=", 2);
if (vals != NULL) {
g_hash_table_insert (hash, vals[0], vals[1]);
}
}
out:
return hash;
}
char *
proc_pid_get_env (pid_t pid,
const char *var)
{
GHashTable *hash;
char *val;
hash = proc_pid_get_env_hash (pid);
val = g_hash_table_lookup (hash, var);
return val;
}
uid_t
proc_pid_get_uid (pid_t pid)
{
struct stat st;
char *path;
int uid;
int res;
g_return_val_if_fail (pid > 1, 0);
uid = -1;
path = g_strdup_printf ("/proc/%u", (guint)pid);
res = stat (path, &st);
g_free (path);
if (res == 0) {
uid = st.st_uid;
}
return uid;
}
pid_t
proc_pid_get_ppid (pid_t pid)
{
int ppid;
gboolean res;
proc_stat_t *stat;
g_return_val_if_fail (pid > 1, 0);
ppid = -1;
res = proc_stat_new_for_pid (pid, &stat, NULL);
if (! res) {
goto out;
}
ppid = proc_stat_get_ppid (stat);
proc_stat_free (stat);
out:
return ppid;
}
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