107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
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/*
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* vio.c - probing for vio devices on the iSeries (viocd and viodasd)
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*
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* Copyright (C) 2003 Red Hat, Inc. 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 of the License, or
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* (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author(s): Jeremy Katz <katzj@redhat.com>
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.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 <unistd.h>
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#if defined(__powerpc__)
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static int readFD (int fd, char **buf)
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{
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char *p;
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size_t size = 4096;
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int s, filesize;
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*buf = malloc (size);
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if (*buf == 0)
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return -1;
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filesize = 0;
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do {
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p = &(*buf) [filesize];
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s = read (fd, p, 4096);
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if (s < 0)
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break;
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filesize += s;
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if (s == 0)
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break;
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size += 4096;
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*buf = realloc (*buf, size);
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} while (1);
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if (filesize == 0 && s < 0) {
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free (*buf);
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*buf = NULL;
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return -1;
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}
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return filesize;
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}
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#endif
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int isVioConsole(void) {
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#if !defined(__powerpc__)
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return 0;
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#else
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int fd, i;
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char *buf, *start;
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char driver[50], device[50];
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static int isviocons = -1;
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if (isviocons != -1)
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return isviocons;
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fd = open("/proc/tty/drivers", O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "failed to open /proc/tty/drivers!\n");
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return 0;
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}
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i = readFD(fd, &buf);
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if (i < 1) {
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close(fd);
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fprintf(stderr, "error reading /proc/tty/drivers!\n");
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return 0;
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}
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close(fd);
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buf[i] = '\0';
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isviocons = 0;
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start = buf;
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while (start && *start) {
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if (sscanf(start, "%s %s", (char *) &driver, (char *) &device) == 2) {
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if (!strcmp(driver, "vioconsole") && !strcmp(device, "/dev/tty")) {
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isviocons = 1;
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break;
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}
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}
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start = strchr(start, '\n');
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if (start)
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start++;
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}
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free(buf);
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return isviocons;
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#endif
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}
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