explain_vfprintf_or_die3
Formatted output conversion and report errors
Usage
#include <libexplain/vfprintf.h>
void explain_vfprintf_or_die(FILE *fp, const char *format, va_list ap);
int explain_vfprintf_on_error(FILE *fp, const char *format, va_list ap);
Overview
The explain_vfprintf_or_die function is used to call the vfprintf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_vfprintf(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_vfprintf_on_error function is used to call the vfprintf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_vfprintf(3) function, but still returns to the caller.
fp
|
The fp, exactly as to be passed to the vfprintf(3) system call. |
|---|---|
format
|
The format, exactly as to be passed to the vfprintf(3) system call. |
ap
|
The ap, exactly as to be passed to the vfprintf(3) system call. |
Return value
The explain_vfprintf_or_die function only returns on success, see vfprintf(3) for more information. On failure, prints an explanation and exits, it does not return.
The explain_vfprintf_on_error function always returns the value return by the wrapped vfprintf(3) system call.
Examples
The explain_vfprintf_or_die function is intended to be used in a fashion similar to the following example:
explain_vfprintf_or_die(fp, format, ap);Releases
6 releases since Debian 7 (Wheezy); the text changed 1 time.