unlink.c

这个是学习嵌入式开发的重要例子

#include <stdio.h>
#include <stdlib.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>

int main(int argc, char **argv)
{
  if (argc < 2)
  {
    fprintf(stderr, "Usage: %s <name>\n", argv[0]);
    exit(1);
  }

  //Upon  successful  completion,  the  sem_unlink()  function  shall  return  a  value of 0. Otherwise, the
  //semaphore shall not be changed and the function shall return a value of -1 and set errno to indicate the
  //error.

  if (sem_unlink(argv[1]) < 0)
  {
    fprintf(stderr, "sem_unlink() failed: %s\n", strerror(errno));
    exit(1);
  }

  fprintf(stdout, "sem_unlink() successed.\n");

  return 0;
}