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/* | |
* outp.c -- write all the ports specified in hex on the command line. | |
* The program uses the faster ioperm/iopl calls on x86, /dev/port | |
* on other platforms. The program acts as outb/outw/outl according | |
* to its own name | |
* | |
* Copyright (C) 1998,2000,2001 Alessandro Rubini | |
* | |
* 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, write to the Free Software | |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. | |
*/ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <sys/io.h> /* linux-specific */ | |
#ifdef __GLIBC__ | |
# include <sys/perm.h> | |
#endif | |
#define PORT_FILE "/dev/port" | |
char *prgname; | |
#ifdef __i386__ | |
static int write_one(unsigned int port, unsigned int val, int size) | |
{ | |
static int iopldone = 0; | |
if (port > 1024) { | |
if (!iopldone && iopl(3)) { | |
fprintf(stderr, "%s: iopl(): %s\n", prgname, strerror(errno)); | |
return 1; | |
} | |
iopldone++; | |
} else if (ioperm(port,size,1)) { | |
fprintf(stderr, "%s: ioperm(%x): %s\n", prgname, | |
port, strerror(errno)); | |
return 1; | |
} | |
if (size == 4) | |
outl(val, port); | |
else if (size == 2) | |
outw(val&0xffff, port); | |
else | |
outb(val&0xff, port); | |
return 0; | |
} | |
#else /* not i386 */ | |
static int write_one(unsigned int port, unsigned int val, int size) | |
{ | |
static int fd = -1; | |
unsigned char b; unsigned short w; | |
if (fd < 0) | |
fd = open(PORT_FILE, O_WRONLY); | |
if (fd < 0) { | |
fprintf(stderr, "%s: %s: %s\n", prgname, PORT_FILE, strerror(errno)); | |
return 1; | |
} | |
lseek(fd, port, SEEK_SET); | |
if (size == 4) { | |
write(fd, &val, 4); | |
} else if (size == 2) { | |
w = val; | |
write(fd, &w, 2); | |
} else { | |
b = val; | |
write(fd, &b, 1); | |
} | |
return 0; | |
} | |
#endif /* i386 */ | |
int main(int argc, char **argv) | |
{ | |
unsigned int i, n, port, val, size, error = 0; | |
prgname = argv[0]; | |
/* find the data size */ | |
switch (prgname[strlen(prgname)-1]) { | |
case 'w': size = 2; break; | |
case 'l': size = 4; break; | |
case 'b': case 'p': default: | |
size = 1; | |
} | |
setuid(0); /* if we're setuid, force it on */ | |
for (i=1;i<argc-1;i++) { | |
if ( sscanf(argv[i], "%x%n", &port, &n) < 1 | |
|| n != strlen(argv[i]) ) { | |
fprintf(stderr, "%s: argument \"%s\" is not a hex number\n", | |
argv[0], argv[i]); | |
error++; continue; | |
} | |
if (port & (size-1)) { | |
fprintf(stderr, "%s: argument \"%s\" is not properly aligned\n", | |
argv[0], argv[i]); | |
error++; continue; | |
} | |
if ( sscanf(argv[i+1], "%x%n", &val, &n) < 1 | |
|| n != strlen(argv[i+1]) ) { | |
fprintf(stderr, "%s: argument \"%s\" is not a hex number\n", | |
argv[0], argv[i+1]); | |
error++; continue; | |
} | |
if (size < 4 && val > (size == 1 ? 0xff : 0xffff)) { | |
fprintf(stderr, "%s: argument \"%s\" out of range\n", | |
argv[0], argv[i+1]); | |
error++; continue; | |
} | |
error += write_one(port, val, size); | |
} | |
exit (error ? 1 : 0); | |
} |