22 lines
431 B
C
22 lines
431 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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int main(int argc, char* argv[])
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{
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int stat, fd;
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if(argc != 2) {
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fprintf(stderr, "Usage %s <device>\n", argv[0]);
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exit(-1);
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}
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fd = open(argv[1], O_RDONLY);
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if(fd == -1) {
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perror(argv[0]);
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exit(1);
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}
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ioctl(fd, TIOCMGET, &stat);
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if(stat & TIOCM_RTS) printf("Not asserted\n"); else printf("Asserted\n");
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return 0;
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}
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