28 lines
506 B
C
28 lines
506 B
C
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <string.h>
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#include <unistd.h>
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#define HELLOCTL "/dev/helloctl"
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int main(int argc, char ** argv) {
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int fd = -1;
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fd = open(HELLOCTL, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Could not open %s\n", HELLOCTL);
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_exit(1);
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}
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int ret;
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if (ret = ioctl(fd, 1, 1) < 0) {
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fprintf(stderr, "ioctl failed with: %s\n", strerror(ret));
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goto done;
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}
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done:
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close(fd);
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}
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