SIMPLE SOLUTIONS

EXPLAIN_FILENO_OR_DIE - reference manual online

Check and reset stream status and report errors.

Chapter
explain_fileno_or_die(3)             Library Functions Manual            explain_fileno_or_die(3)

NAME explain_fileno_or_die - check and reset stream status and report errors
SYNOPSIS #include <libexplain/fileno.h> int explain_fileno_or_die(FILE *fp); int explain_fileno_on_error(FILE *fp);
DESCRIPTION The explain_fileno_or_die function is used to call the fileno(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_fileno(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_fileno_on_error function is used to call the fileno(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_fileno(3) function, but still returns to the caller. fp The fp, exactly as to be passed to the fileno(3) system call.
RETURN VALUE The explain_fileno_or_die function only returns on success, see fileno(3) for more infor‐ mation. On failure, prints an explanation and exits, it does not return. The explain_fileno_on_error function always returns the value return by the wrapped fileno(3) system call.
EXAMPLE The explain_fileno_or_die function is intended to be used in a fashion similar to the fol‐ lowing example: explain_fileno_or_die(fp);
SEE ALSO fileno(3) check and reset stream status explain_fileno(3) explain fileno(3) errors exit(2) terminate the calling process
explain_fileno_or_die(3)
This manual Reference Other manuals
explain_fileno_or_die(3) referred by explain(3) | explain_fileno(3)
refer to _exit(2) | explain_fileno(3) | ferror(3)