NAME¶
explain_poll_or_die - wait for some event on file descriptor and report errors
SYNOPSIS¶
#include <libexplain/poll.h>
int explain_poll_or_die(struct pollfd *fds, int nfds, int timeout);
int explain_poll_on_error(struct pollfd *fds, int nfds, int timeout);
DESCRIPTION¶
The
explain_poll_or_die function is used to call the
poll(2)
system call. On failure an explanation will be printed to
stderr,
obtained from the
explain_poll(3) function, and then the process
terminates by calling exit(EXIT_FAILURE).
The
explain_poll_on_error function is used to call the
poll(2)
system call. On failure an explanation will be printed to
stderr,
obtained from the
explain_poll(3) function, but still returns to the
caller.
- fds
- The fds, exactly as to be passed to the poll(2)
system call.
- nfds
- The nfds, exactly as to be passed to the poll(2)
system call.
- timeout
- The timeout, exactly as to be passed to the poll(2)
system call.
RETURN VALUE¶
The
explain_poll_or_die function only returns on success, see
poll(2) for more information. On failure, prints an explanation and
exits, it does not return.
The
explain_poll_on_error function always returns the value return by the
wrapped
poll(2) system call.
EXAMPLE¶
The
explain_poll_or_die function is intended to be used in a fashion
similar to the following example:
int result = explain_poll_or_die(fds, nfds, timeout);
SEE ALSO¶
- poll(2)
- wait for some event on a file descriptor
- explain_poll(3)
- explain poll(2) errors
- exit(2)
- terminate the calling process
COPYRIGHT¶
libexplain version 0.52
Copyright (C) 2010 Peter Miller