poll.h File Reference

#include <signal.h>
#include <stdint.h>

Include dependency graph for poll.h:

Go to the source code of this file.

Data Structures
struct	pollfd

Macros
#define	POLLIN   1
#define	POLLOUT   4
#define	POLLNVAL   32

Typedefs
typedef uint32_t	nfds_t

Functions
int	poll (struct pollfd *fds, nfds_t nfds, int timeout)
	Wait for one of a set of file descriptors to become ready to perform I/O. More...
int	ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout_ts, const sigset_t *sigmask)
	Wait for one of the descriptors to become ready, with the timeout given as a timespec. Tenok blocks no signal, so the mask is accepted and has nothing to do. More...

Function Documentation

poll()

int poll	(	struct pollfd *	fds,
		nfds_t	nfds,
		int	timeout
	)

Wait for one of a set of file descriptors to become ready to perform I/O.

Parameters

fds	A set of file descriptors with events to wait.
nfds	Number of the provided fds.
timeout	The number of milliseconds that poll() should block waiting for a file descriptor to become ready. Negative value means an infinite timeout and zero causes poll() to return immediately.

Return values

int	The number of the ready descriptors on success and -1 on error, with the reason left in errno.

ppoll()

int ppoll	(	struct pollfd *	fds,
		nfds_t	nfds,
		const struct timespec *	timeout_ts,
		const sigset_t *	sigmask
	)

Wait for one of the descriptors to become ready, with the timeout given as a timespec. Tenok blocks no signal, so the mask is accepted and has nothing to do.

Parameters

fds	The descriptors to wait on.
nfds	How many of them there are.
timeout_ts	How long to wait, or a null pointer to wait forever.
sigmask	The signals to block while waiting. Not used.

Return values

int	The number of the ready descriptors on success and -1 on error, with the reason left in errno.