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/*
* vio.c - probing for vio devices on the iSeries (viocd and viodasd)
*
* Copyright (C) 2003 Red Hat, Inc. All rights reserved.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Author(s): Jeremy Katz <katzj@redhat.com>
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__powerpc__)
static int readFD (int fd, char **buf)
{
char *p;
size_t size = 4096;
int s, filesize;
*buf = malloc (size);
if (*buf == 0)
return -1;
filesize = 0;
do {
p = &(*buf) [filesize];
s = read (fd, p, 4096);
if (s < 0)
break;
filesize += s;
if (s == 0)
break;
size += 4096;
*buf = realloc (*buf, size);
} while (1);
if (filesize == 0 && s < 0) {
free (*buf);
*buf = NULL;
return -1;
}
return filesize;
}
#endif
int isVioConsole(void) {
#if !defined(__powerpc__)
return 0;
#else
int fd, i;
char *buf, *start;
char driver[50], device[50];
static int isviocons = -1;
if (isviocons != -1)
return isviocons;
fd = open("/proc/tty/drivers", O_RDONLY);
if (fd < 0) {
fprintf(stderr, "failed to open /proc/tty/drivers!\n");
return 0;
}
i = readFD(fd, &buf);
if (i < 1) {
close(fd);
fprintf(stderr, "error reading /proc/tty/drivers!\n");
return 0;
}
close(fd);
buf[i] = '\0';
isviocons = 0;
start = buf;
while (start && *start) {
if (sscanf(start, "%s %s", (char *) &driver, (char *) &device) == 2) {
if (!strcmp(driver, "vioconsole") && !strcmp(device, "/dev/tty")) {
isviocons = 1;
break;
}
}
start = strchr(start, '\n');
if (start)
start++;
}
free(buf);
return isviocons;
#endif
}
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