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Failed System Calls (cont)

Action in response to failed system call is often e.g. 

fprintf(stderr, "Can't do %s", Something);
exit(1);


Can give more precise feedback via library functions, e.g.

  • void perror(char *Message)
  • writes to stderr
  • writes message and standard message corresponding to errno
  • Also see the strerror function
Could then do  exit(errno);  to send precise error to shell.

To show the exit code after the program has run type echo $? in your terminal.