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  1. /** Demonstrate that fcntl(fd, F_GETFL) may fail.
  2.  
  3.     $ gcc *.c && ./a.out
  4. */
  5.  
  6. #include <stdlib.h>
  7.  
  8. #include <unistd.h>
  9. #include <fcntl.h>
  10.  
  11. int main(void) {
  12.   int invalid_fd = -1;
  13.   if (fcntl(invalid_fd, F_GETFL) == -1) {
  14.     perror("fcntl");
  15.     exit(EXIT_FAILURE);
  16.   }
  17.   return 0;
  18. }
  19.  
Runtime error #stdin #stdout #stderr 0s 2288KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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fcntl: Bad file descriptor
https://ideone.com/WKJ8it
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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