NAME¶
explain_vprintf_or_die - formatted output conversion and report errors
SYNOPSIS¶
#include <libexplain/vprintf.h>
int explain_vprintf_or_die(const char *format, va_list ap);
int explain_vprintf_on_error(const char *format, va_list ap);
DESCRIPTION¶
The
explain_vprintf_or_die function is used to call the
vprintf(3)
system call. On failure an explanation will be printed to
stderr,
obtained from the
explain_vprintf(3) function, and then the process
terminates by calling exit(EXIT_FAILURE).
The
explain_vprintf_on_error function is used to call the
vprintf(3) system call. On failure an explanation will be printed to
stderr, obtained from the
explain_vprintf(3) function, but still
returns to the caller.
- format
- The format, exactly as to be passed to the
vprintf(3) system call.
- ap
- The ap, exactly as to be passed to the vprintf(3)
system call.
RETURN VALUE¶
The
explain_vprintf_or_die function only returns on success, see
vprintf(3) for more information. On failure, prints an explanation and
exits, it does not return.
The
explain_vprintf_on_error function always returns the value return by
the wrapped
vprintf(3) system call.
EXAMPLE¶
The
explain_vprintf_or_die function is intended to be used in a fashion
similar to the following example:
int result = explain_vprintf_or_die(format, ap);
SEE ALSO¶
- vprintf(3)
- formatted output conversion
- explain_vprintf(3)
- explain vprintf(3) errors
- exit(2)
- terminate the calling process
COPYRIGHT¶
libexplain version 0.52
Copyright (C) 2010 Peter Miller