9e97fee019
1) Implement documented but unimplemented read-only option.
2) Allow standard input to be used as the <device> by passing
"-". On some devices, opening the device has side effects.
Allowing standard input can prevent this by using a sequence
of something like:
# Open the device on file descriptor 3
exec 3<> /dev/something
ioctl -d - 0 0 <&3
ioctl -d - 1 0 <&3
dd if=myfile >&3
# Close file descriptor 3
exec 3>&-
Change-Id: If17ac3cffa7ccb159051550724b4ce7d8efa5feb
Signed-off-by: Scott Anderson <saa@android.com>
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <string.h>
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#include <linux/kd.h>
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#include <linux/vt.h>
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#include <errno.h>
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#include <pthread.h>
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#include <sys/ioctl.h>
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int ioctl_main(int argc, char *argv[])
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{
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int c;
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int fd;
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int res;
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int read_only = 0;
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int length = -1;
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int arg_size = 4;
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int direct_arg = 0;
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uint32_t ioctl_nr;
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void *ioctl_args;
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uint8_t *ioctl_argp;
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uint8_t *ioctl_argp_save;
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int rem;
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do {
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c = getopt(argc, argv, "rdl:a:h");
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if (c == EOF)
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break;
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switch (c) {
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case 'r':
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read_only = 1;
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break;
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case 'd':
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direct_arg = 1;
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break;
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case 'l':
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length = strtol(optarg, NULL, 0);
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break;
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case 'a':
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arg_size = strtol(optarg, NULL, 0);
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break;
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case 'h':
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fprintf(stderr, "%s [-l <length>] [-a <argsize>] [-rdh] <device> <ioctlnr>\n"
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" -l <lenght> Length of io buffer\n"
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" -a <argsize> Size of each argument (1-8)\n"
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" -r Open device in read only mode\n"
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" -d Direct argument (no iobuffer)\n"
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" -h Print help\n", argv[0]);
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return -1;
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case '?':
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fprintf(stderr, "%s: invalid option -%c\n",
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argv[0], optopt);
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exit(1);
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}
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} while (1);
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if(optind + 2 > argc) {
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fprintf(stderr, "%s: too few arguments\n", argv[0]);
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exit(1);
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}
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if (!strcmp(argv[optind], "-")) {
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fd = STDIN_FILENO;
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} else {
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fd = open(argv[optind], read_only ? O_RDONLY : (O_RDWR | O_SYNC));
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if (fd < 0) {
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fprintf(stderr, "cannot open %s\n", argv[optind]);
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return 1;
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}
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}
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optind++;
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ioctl_nr = strtol(argv[optind], NULL, 0);
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optind++;
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if(direct_arg) {
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arg_size = 4;
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length = 4;
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}
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if(length < 0) {
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length = (argc - optind) * arg_size;
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}
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if(length) {
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ioctl_args = calloc(1, length);
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ioctl_argp_save = ioctl_argp = ioctl_args;
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rem = length;
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while(optind < argc) {
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uint64_t tmp = strtoull(argv[optind], NULL, 0);
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if(rem < arg_size) {
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fprintf(stderr, "%s: too many arguments\n", argv[0]);
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exit(1);
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}
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memcpy(ioctl_argp, &tmp, arg_size);
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ioctl_argp += arg_size;
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rem -= arg_size;
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optind++;
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}
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}
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printf("sending ioctl 0x%x", ioctl_nr);
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rem = length;
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while(rem--) {
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printf(" 0x%02x", *ioctl_argp_save++);
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}
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printf("\n");
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if(direct_arg)
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res = ioctl(fd, ioctl_nr, *(uint32_t*)ioctl_args);
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else if(length)
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res = ioctl(fd, ioctl_nr, ioctl_args);
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else
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res = ioctl(fd, ioctl_nr, 0);
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if (res < 0) {
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fprintf(stderr, "ioctl 0x%x failed, %d\n", ioctl_nr, res);
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return 1;
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}
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if(length) {
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printf("return buf:");
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ioctl_argp = ioctl_args;
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rem = length;
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while(rem--) {
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printf(" %02x", *ioctl_argp++);
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}
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printf("\n");
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}
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return 0;
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}
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