NAME¶
explain_eventfd_or_die - create event notify file descriptor and report errors
SYNOPSIS¶
#include <libexplain/eventfd.h>
int explain_eventfd_or_die(unsigned int initval, int flags);
int explain_eventfd_on_error(unsigned int initval, int flags);
DESCRIPTION¶
The
explain_eventfd_or_die function is used to call the
eventfd(2)
system call. On failure an explanation will be printed to
stderr,
obtained from the
explain_eventfd(3) function, and then the process
terminates by calling exit(EXIT_FAILURE).
The
explain_eventfd_on_error function is used to call the
eventfd(2) system call. On failure an explanation will be printed to
stderr, obtained from the
explain_eventfd(3) function, but still
returns to the caller.
- initval
- The initval, exactly as to be passed to the
eventfd(2) system call.
- flags
- The flags, exactly as to be passed to the eventfd(2)
system call.
RETURN VALUE¶
The
explain_eventfd_or_die function only returns on success, see
eventfd(2) for more information. On failure, prints an explanation and
exits, it does not return.
The
explain_eventfd_on_error function always returns the value return by
the wrapped
eventfd(2) system call.
EXAMPLE¶
The
explain_eventfd_or_die function is intended to be used in a fashion
similar to the following example:
int result = explain_eventfd_or_die(initval, flags);
SEE ALSO¶
- eventfd(2)
- create a file descriptor for event notification
- explain_eventfd(3)
- explain eventfd(2) errors
- exit(2)
- terminate the calling process
COPYRIGHT¶
libexplain version 0.52
Copyright (C) 2009 Peter Miller