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/* $Id$ */
/* Copyright (C) 1998-99 Martin Baulig
This file is part of LibGTop 1.0.
Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
LibGTop 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.
LibGTop 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 LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <glibtop/proclist.h>
#include <glibtop/procuid.h>
#include <glibtop/procstate.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
static const unsigned long _glibtop_sysdeps_proclist =
(1L << GLIBTOP_PROCLIST_TOTAL) + (1L << GLIBTOP_PROCLIST_NUMBER) +
(1L << GLIBTOP_PROCLIST_SIZE);
/* Init function. */
void
glibtop_init_proclist_s (glibtop *server)
{
server->sysdeps.proclist = _glibtop_sysdeps_proclist;
}
#define BLOCK_COUNT 256
#define BLOCK_SIZE (BLOCK_COUNT * sizeof (unsigned))
/* Fetch list of currently running processes.
*
* The interface of this function is a little bit different from the others:
* buf->flags is only set if the call succeeded, in this case pids_chain,
* a list of the pids of all currently running processes is returned,
* buf->number is the number of elements of this list and buf->size is
* the size of one single element (sizeof (unsigned)). The total size is
* stored in buf->total.
*
* The calling function has to free the memory to which a pointer is returned.
*
* On error, NULL is returned and buf->flags is zero. */
unsigned *
glibtop_get_proclist_s (glibtop *server, glibtop_proclist *buf,
int64_t which, int64_t arg)
{
DIR *proc;
struct dirent *entry;
char buffer [BUFSIZ];
unsigned count, total, pid;
unsigned pids [BLOCK_COUNT], *pids_chain = NULL;
unsigned pids_size = 0, pids_offset = 0, new_size;
struct stat statb;
int len, i, ok;
glibtop_proc_uid procuid;
glibtop_proc_state procstate;
glibtop_init_s (&server, GLIBTOP_SYSDEPS_PROCLIST, 0);
memset (buf, 0, sizeof (glibtop_proclist));
proc = opendir ("/proc");
if (!proc) return NULL;
/* read every every entry in /proc */
for (count = total = 0, entry = readdir (proc);
entry; entry = readdir (proc)) {
ok = 1; len = strlen (entry->d_name);
/* does it consist entirely of digits? */
for (i = 0; i < len; i++)
if (!isdigit (entry->d_name [i])) ok = 0;
if (!ok) continue;
/* convert it in a number */
if (sscanf (entry->d_name, "%u", &pid) != 1) continue;
/* is it really a directory? */
sprintf (buffer, "/proc/%d", pid);
if (stat (buffer, &statb)) continue;
if (!S_ISDIR (statb.st_mode)) continue;
switch (which & GLIBTOP_KERN_PROC_MASK) {
case GLIBTOP_KERN_PROC_ALL:
break;
case GLIBTOP_KERN_PROC_PID:
if ((unsigned) arg != pid)
continue;
break;
case GLIBTOP_KERN_PROC_UID:
if ((uid_t) arg != statb.st_uid)
continue;
break;
case GLIBTOP_KERN_PROC_PGRP:
/* Do you really, really need this ? */
glibtop_get_proc_uid_s (server, &procuid, pid);
if (procuid.flags & (1L << GLIBTOP_PROC_UID_PGRP))
if ((int) arg != procuid.pgrp)
continue;
break;
case GLIBTOP_KERN_PROC_SESSION:
/* Do you really, really need this ? */
glibtop_get_proc_uid_s (server, &procuid, pid);
if (procuid.flags & (1L << GLIBTOP_PROC_UID_SESSION))
if ((int) arg != procuid.session)
continue;
break;
case GLIBTOP_KERN_PROC_TTY:
/* Do you really, really need this ? */
glibtop_get_proc_uid_s (server, &procuid, pid);
if (procuid.flags & (1L << GLIBTOP_PROC_UID_TTY))
if ((int) arg != procuid.tty)
continue;
break;
case GLIBTOP_KERN_PROC_RUID:
/* Do you really, really need this ? */
glibtop_get_proc_uid_s (server, &procuid, pid);
if (procuid.flags & (1L << GLIBTOP_PROC_UID_EUID))
if ((int) arg != procuid.euid)
continue;
break;
}
if (which & GLIBTOP_EXCLUDE_NOTTY) {
glibtop_get_proc_uid_s (server, &procuid, pid);
if (procuid.flags & (1L << GLIBTOP_PROC_UID_TTY))
if (procuid.tty == -1) continue;
}
if (which & GLIBTOP_EXCLUDE_IDLE) {
glibtop_get_proc_state_s (server, &procstate, pid);
if (procstate.flags & (1L << GLIBTOP_PROC_STATE_STATE))
if (procstate.state != 'R') continue;
}
if (which & GLIBTOP_EXCLUDE_SYSTEM) {
glibtop_get_proc_uid_s (server, &procuid, pid);
if (procuid.flags & (1L << GLIBTOP_PROC_UID_UID))
if (procuid.uid == 0) continue;
}
/* Fine. Now we first try to store it in pids. If this buffer is
* full, we copy it to the pids_chain. */
if (count >= BLOCK_COUNT) {
/* The following call to g_realloc will be
* equivalent to g_malloc () if `pids_chain' is
* NULL. We just calculate the new size and copy `pids'
* to the beginning of the newly allocated block. */
new_size = pids_size + BLOCK_SIZE;
pids_chain = g_realloc (pids_chain, new_size);
memcpy (pids_chain + pids_offset, pids, BLOCK_SIZE);
pids_size = new_size;
pids_offset += BLOCK_COUNT;
count = 0;
}
/* pids is now big enough to hold at least one single pid. */
pids [count++] = pid;
total++;
}
closedir (proc);
/* count is only zero if an error occured (one a running Linux system,
* we have at least one single process). */
if (!count) return NULL;
/* The following call to g_realloc will be equivalent to
* g_malloc if pids_chain is NULL. We just calculate the
* new size and copy pids to the beginning of the newly allocated
* block. */
new_size = pids_size + count * sizeof (unsigned);
pids_chain = g_realloc (pids_chain, new_size);
memcpy (pids_chain + pids_offset, pids, count * sizeof (unsigned));
pids_size = new_size;
pids_offset += BLOCK_COUNT;
/* Since everything is ok now, we can set buf->flags, fill in the
* remaining fields and return the `pids_chain'. */
buf->flags = _glibtop_sysdeps_proclist;
buf->size = sizeof (unsigned);
buf->number = total;
buf->total = total * sizeof (unsigned);
return pids_chain;
}
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