31 lines
687 B
C
31 lines
687 B
C
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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int main(int argc, char * argv[]) {
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if (argc < 2 ){
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fprintf(stderr, "usage: test-lock LOCKPATH\n");
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return 1;
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}
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int fd = open(argv[1],O_RDWR|O_CREAT|O_EXCL);
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if (fd < 0) {
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if (errno == EEXIST) {
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fprintf(stderr, "Lock is already held.\n");
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return 0;
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} else {
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fprintf(stderr, "Some other error? %d = %s\n", errno, strerror(errno));
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return 1;
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}
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} else {
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fprintf(stderr, "I have the lock, the fd is %d.\n", fd);
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fprintf(stderr, "Press Enter to release lock.\n");
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while (!feof(stdin) && fgetc(stdin) != '\n') {
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/* nothing */
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}
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close(fd);
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unlink(argv[1]);
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return 0;
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}
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}
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