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/*
* Copyright (c) 2004 SuSE Linux AG
*
* 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, 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 (see the file COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#ifndef __FreeBSD__
#include <sys/sysmacros.h>
#endif
#include <sys/stat.h>
#include <termios.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#ifndef PATH_MAX
# ifdef MAXPATHLEN
# define PATH_MAX MAXPATHLEN
# else
# define PATH_MAX 2048
# endif
#endif
#include <dirent.h>
#include "proc.h"
#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
# ifndef restrict
# define restrict __restrict__
# endif
#endif
#define alignof(type) ((sizeof(type)+(sizeof(void*)-1)) & ~(sizeof(void*)-1))
static unsigned long int scan_one(const char* buff, const char *key)
{
const char *b = strstr(buff, key);
unsigned long val = 0;
if (!b) {
#if DEBUG
fprintf(stderr, "ERROR: no hit for %s\n", key);
#endif
return ~0UL;
}
if (sscanf(b + strlen(key), " %lu", &val) != 1)
return 0;
return val;
}
int read_proc(unsigned long int * const prcs_run, unsigned long int * const prcs_blked)
{
char StatBuf[2048], *ptr = &StatBuf[0];
unsigned long int running, blocked;
ssize_t len;
size_t skip;
FILE *stat;
*prcs_run = 0;
*prcs_blked = 0;
if ((stat = fopen("/proc/stat", "r")) == (FILE*)0) {
fprintf(stderr, "ERROR: could not open /proc/stat: %s\n", strerror(errno));
return 1;
}
len = sizeof(StatBuf);
while ((len > 0) && (fgets(ptr, len, stat))) {
if (ptr[0] != 'p')
continue;
skip = strlen(ptr);
len -= skip;
ptr += skip;
}
fclose(stat);
/* These fields are not present in /proc/stat for 2.4 kernels or GNU/kFreeBSD */
running = scan_one(StatBuf, "procs_running");
blocked = scan_one(StatBuf, "procs_blocked");
if (running == ~0UL || blocked == ~0UL)
return 1;
*prcs_run = running;
*prcs_blked = blocked;
return 0;
}
struct console {
char * tty;
int tlock;
struct termios ltio, otio;
struct console *restrict next;
};
static struct console *restrict consoles;
static dev_t comparedev;
static char* scandev(DIR *dir)
{
char *name = (char*)0;
struct dirent *dent;
int fd;
char *path = (char *)0;
size_t allocpathlen = 0;
fd = dirfd(dir);
rewinddir(dir);
while ((dent = readdir(dir))) {
struct stat st;
size_t pathlen = 0;
if (fstatat(fd, dent->d_name, &st, 0) < 0)
continue;
if (!S_ISCHR(st.st_mode))
continue;
if (comparedev != st.st_rdev)
continue;
/* Space for d_name, /dev/ and nul */
pathlen = strlen(dent->d_name) + 6;
if (pathlen > allocpathlen) {
char *newpath = realloc(path, sizeof(char) * pathlen);
if (newpath) {
path = newpath;
allocpathlen = pathlen;
}
}
if (path == NULL)
continue;
if ((size_t)snprintf(path, pathlen, "/dev/%s", dent->d_name) >= allocpathlen)
continue;
name = realpath(path, NULL);
break;
}
free(path);
return name;
}
void detect_consoles(void)
{
FILE *fc;
if ((fc = fopen("/proc/consoles", "r"))) {
char fbuf[16];
int maj, min;
DIR *dir;
dir = opendir("/dev");
if (!dir)
goto out;
while ((fscanf(fc, "%*s %*s (%[^)]) %d:%d", &fbuf[0], &maj, &min) == 3)) {
struct console *restrict tail = NULL;
char * name;
if (!strchr(fbuf, 'E'))
continue;
comparedev = makedev(maj, min);
name = scandev(dir);
if (!name)
continue;
if (posix_memalign((void*)&tail, sizeof(void*), alignof(typeof(struct console))) != 0)
{
perror("memory allocation in detect_consoles");
exit(1);
}
tail->next = (struct console*)0;
tail->tty = name;
if (!consoles)
consoles = tail;
else
consoles->next = tail;
}
closedir(dir);
out:
fclose(fc);
}
}
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