110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
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/*
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* consoles.c Routines to detect the system consoles
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*
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* Copyright (c) 2011 SuSE LINUX Products GmbH, All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* Author: Werner Fink <werner@suse.de>
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*/
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include "consoles.h"
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#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
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# ifndef typeof
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# define typeof __typeof__
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# endif
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# ifndef restrict
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# define restrict __restrict__
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# endif
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#endif
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#define alignof(type) ((sizeof(type)+(sizeof(void*)-1)) & ~(sizeof(void*)-1))
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struct console *consoles;
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static dev_t comparedev;
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static char* scandev(DIR *dir)
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{
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char *name = (char*)0;
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struct dirent *dent;
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int fd;
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fd = dirfd(dir);
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rewinddir(dir);
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while ((dent = readdir(dir))) {
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char path[PATH_MAX];
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struct stat st;
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if (fstatat(fd, dent->d_name, &st, 0) < 0)
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continue;
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if (!S_ISCHR(st.st_mode))
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continue;
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if (comparedev != st.st_rdev)
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continue;
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if ((size_t)snprintf(path, sizeof(path), "/dev/%s", dent->d_name) >= sizeof(path))
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continue;
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name = realpath(path, NULL);
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break;
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}
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return name;
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}
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void detect_consoles(void)
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{
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FILE *fc;
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if ((fc = fopen("/proc/consoles", "r"))) {
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char fbuf[16];
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int maj, min;
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DIR *dir;
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dir = opendir("/dev");
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if (!dir)
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goto out;
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while ((fscanf(fc, "%*s %*s (%[^)]) %d:%d", &fbuf[0], &maj, &min) == 3)) {
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struct console *restrict tail;
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char * name;
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if (!strchr(fbuf, 'E'))
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continue;
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comparedev = makedev(maj, min);
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name = scandev(dir);
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if (!name)
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continue;
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if (posix_memalign((void*)&tail, sizeof(void*), alignof(typeof(struct console))) != 0)
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perror("memory allocation");
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tail->next = (struct console*)0;
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tail->tty = name;
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if (!consoles)
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consoles = tail;
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else
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consoles->next = tail;
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}
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closedir(dir);
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out:
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fclose(fc);
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}
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}
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