src/vcl/ldp_glibc_socket.h - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2017-2019 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef included_ldp_glibc_socket_h
 #define included_ldp_glibc_socket_h

 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/select.h>
 #include <arpa/inet.h>
 #include <fcntl.h>

 #include <sys/epoll.h>

 #include <signal.h>
 #include <poll.h>

 /*
  *
  * Generic glibc fd api
  *
  */
 /*
  * glibc APIs from <unistd.h>
  */

 /* Close the file descriptor FD.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int close (int __fd);

 /* Read NBYTES into BUF from FD.  Return the
    number read, -1 for errors or 0 for EOF.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t __wur read (int __fd, void *__buf, size_t __nbytes);

 /* Write N bytes of BUF to FD.  Return the number written, or -1.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t __wur write (int __fd, const void *__buf, size_t __n);


 /*
  * glibc APIs from <fcntl.h>
  */

 /* Do the file control operation described by CMD on FD.
    The remaining arguments are interpreted depending on CMD.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int fcntl (int __fd, int __cmd, ...);


 /*
  * glibc APIs from <sys/select.h>
  */

 /* Check the first NFDS descriptors each in READFDS (if not NULL) for read
    readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
    (if not NULL) for exceptional conditions.  If TIMEOUT is not NULL, time out
    after waiting the interval specified therein.  Returns the number of ready
    descriptors, or -1 for errors.


    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 select (int __nfds, fd_set * __restrict __readfds,
 	fd_set * __restrict __writefds,
 	fd_set * __restrict __exceptfds,
 	struct timeval *__restrict __timeout);

 #ifdef __USE_XOPEN2K
 /* Same as above only that the TIMEOUT value is given with higher
    resolution and a sigmask which is been set temporarily.  This version
    should be used.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 pselect (int __nfds, fd_set * __restrict __readfds,
 	 fd_set * __restrict __writefds,
 	 fd_set * __restrict __exceptfds,
 	 const struct timespec *__restrict __timeout,
 	 const __sigset_t * __restrict __sigmask);
 #endif


 /*
  *
  * Socket specific glibc api
  *
  */

 /*
  * glibc APIs from <sys/socket.h>
  */

 /* Create a new socket of type TYPE in domain DOMAIN, using
    protocol PROTOCOL.  If PROTOCOL is zero, one is chosen automatically.
    Returns a file descriptor for the new socket, or -1 for errors.  */
 extern int __THROW socket (int __domain, int __type, int __protocol);

 /* Create two new sockets, of type TYPE in domain DOMAIN and using
    protocol PROTOCOL, which are connected to each other, and put file
    descriptors for them in FDS[0] and FDS[1].  If PROTOCOL is zero,
    one will be chosen automatically.  Returns 0 on success, -1 for errors.  */
 extern int __THROW
 socketpair (int __domain, int __type, int __protocol, int __fds[2]);

 /* Give the socket FD the local address ADDR (which is LEN bytes long).  */
 extern int __THROW
 bind (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len);

 /* Put the local address of FD into *ADDR and its length in *LEN.  */
 extern int __THROW
 getsockname (int __fd, __SOCKADDR_ARG __addr, socklen_t * __restrict __len);

 /* Open a connection on socket FD to peer at ADDR (which LEN bytes long).
    For connectionless socket types, just set the default address to send to
    and the only address from which to accept transmissions.
    Return 0 on success, -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int connect (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len);

 /* Put the address of the peer connected to socket FD into *ADDR
    (which is *LEN bytes long), and its actual length into *LEN.  */
 extern int __THROW
 getpeername (int __fd, __SOCKADDR_ARG __addr, socklen_t * __restrict __len);

 /* Send N bytes of BUF to socket FD.  Returns the number sent or -1.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t send (int __fd, const void *__buf, size_t __n, int __flags);

 extern ssize_t sendfile (int __out_fd, int __in_fd, off_t * __offset,
 			 size_t __len);

 /* Read N bytes into BUF from socket FD.
    Returns the number read or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t recv (int __fd, void *__buf, size_t __n, int __flags);

 /* Read N bytes into BUF from socket FD with buffer overflow checking.
    Returns the number read or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t __recv_chk (int fd, void *buf, size_t n, size_t buflen,
 			   int flags);

 /* Send N bytes of BUF on socket FD to peer at address ADDR (which is
    ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t
 sendto (int __fd, const void *__buf, size_t __n,
 	int __flags, __CONST_SOCKADDR_ARG __addr, socklen_t __addr_len);

 /* Read N bytes into BUF through socket FD.
    If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
    the sender, and store the actual size of the address in *ADDR_LEN.
    Returns the number of bytes read or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t
 recvfrom (int __fd, void *__restrict __buf,
 	  size_t __n, int __flags,
 	  __SOCKADDR_ARG __addr, socklen_t * __restrict __addr_len);

 /* Send a message described MESSAGE on socket FD.
    Returns the number of bytes sent, or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t
 sendmsg (int __fd, const struct msghdr *__message, int __flags);

 #ifdef __USE_GNU
 /* Send a VLEN messages as described by VMESSAGES to socket FD.
    Returns the number of datagrams successfully written or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 sendmmsg (int __fd, struct mmsghdr *__vmessages,
 	  unsigned int __vlen, int __flags);
 #endif

 /* Receive a message as described by MESSAGE from socket FD.
    Returns the number of bytes read or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t recvmsg (int __fd, struct msghdr *__message, int __flags);

 #ifdef __USE_GNU
 /* Receive up to VLEN messages as described by VMESSAGES from socket FD.
    Returns the number of messages received or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 recvmmsg (int __fd, struct mmsghdr *__vmessages,
 	  unsigned int __vlen, int __flags, struct timespec *__tmo);
 #endif


 /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
    into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's
    actual length.  Returns 0 on success, -1 for errors.  */
 extern int __THROW
 getsockopt (int __fd, int __level, int __optname,
 	    void *__restrict __optval, socklen_t * __restrict __optlen);

 /* Set socket FD's option OPTNAME at protocol level LEVEL
    to *OPTVAL (which is OPTLEN bytes long).
    Returns 0 on success, -1 for errors.  */
 extern int __THROW
 setsockopt (int __fd, int __level, int __optname,
 	    const void *__optval, socklen_t __optlen);

 /* Prepare to accept connections on socket FD.
    N connection requests will be queued before further requests are refused.
    Returns 0 on success, -1 for errors.  */
 extern int __THROW listen (int __fd, int __n);

 /* Await a connection on socket FD.
    When a connection arrives, open a new socket to communicate with it,
    set *ADDR (which is *ADDR_LEN bytes long) to the address of the connecting
    peer and *ADDR_LEN to the address's actual length, and return the
    new socket's descriptor, or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 accept (int __fd, __SOCKADDR_ARG __addr, socklen_t * __restrict __addr_len);

 /* Similar to 'accept' but takes an additional parameter to specify flags.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
      /* TBD: implemented later */
 extern int
 accept4 (int __fd, __SOCKADDR_ARG __addr,
 	 socklen_t * __restrict __addr_len, int __flags);

 /* Shut down all or part of the connection open on socket FD.
    HOW determines what to shut down:
      SHUT_RD   = No more receptions;
      SHUT_WR   = No more transmissions;
      SHUT_RDWR = No more receptions or transmissions.
    Returns 0 on success, -1 for errors.  */
 extern int __THROW shutdown (int __fd, int __how);


 /*
  * glibc APIs from <sys/epoll.h>
  */

 /* Creates an epoll instance.  Returns an fd for the new instance.
    The "size" parameter is a hint specifying the number of file
    descriptors to be associated with the new instance.  The fd
    returned by epoll_create() should be closed with close().  */
 extern int __THROW epoll_create (int __size);

 /* Same as epoll_create but with an FLAGS parameter.  The unused SIZE
    parameter has been dropped.  */
 extern int __THROW epoll_create1 (int __flags);

 /* Manipulate an epoll instance "epfd". Returns 0 in case of success,
    -1 in case of error ( the "errno" variable will contain the
    specific error code ) The "op" parameter is one of the EPOLL_CTL_*
    constants defined above. The "fd" parameter is the target of the
    operation. The "event" parameter describes which events the caller
    is interested in and any associated user data.  */
 extern int __THROW
 epoll_ctl (int __epfd, int __op, int __fd, struct epoll_event *__event);

 #define EP_INT_MAX ((int)(~0U>>1))
 #define EP_MAX_EVENTS (EP_INT_MAX / sizeof(struct epoll_event))

 /* Wait for events on an epoll instance "epfd". Returns the number of
    triggered events returned in "events" buffer. Or -1 in case of
    error with the "errno" variable set to the specific error code. The
    "events" parameter is a buffer that will contain triggered
    events. The "maxevents" is the maximum number of events to be
    returned ( usually size of "events" ). The "timeout" parameter
    specifies the maximum wait time in milliseconds (-1 == infinite).

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 epoll_wait (int __epfd, struct epoll_event *__events,
 	    int __maxevents, int __timeout);

 /* Same as epoll_wait, but the thread's signal mask is temporarily
    and atomically replaced with the one provided as parameter.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int
 epoll_pwait (int __epfd, struct epoll_event *__events,
 	     int __maxevents, int __timeout, const __sigset_t * __ss);

 /* Poll the file descriptors described by the NFDS structures starting at
    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
    an event to occur; if TIMEOUT is -1, block until an event occurs.
    Returns the number of file descriptors with events, zero if timed out,
    or -1 for errors.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);

 #ifdef __USE_GNU
 /* Like poll, but before waiting the threads signal mask is replaced
    with that specified in the fourth parameter.  For better usability,
    the timeout value is specified using a TIMESPEC object.

    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int ppoll (struct pollfd *__fds, nfds_t __nfds,
 		  const struct timespec *__timeout, const __sigset_t * __ss);
 #endif


 #endif /* included_ldp_glibc_socket_h */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2017-2019 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef included_ldp_glibc_socket_h
	#define included_ldp_glibc_socket_h

	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/select.h>
	#include <arpa/inet.h>
	#include <fcntl.h>

	#include <sys/epoll.h>

	#include <signal.h>
	#include <poll.h>

	/*
	*
	* Generic glibc fd api
	*
	*/
	/*
	* glibc APIs from <unistd.h>
	*/

	/* Close the file descriptor FD.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int close (int __fd);

	/* Read NBYTES into BUF from FD. Return the
	number read, -1 for errors or 0 for EOF.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t __wur read (int __fd, void *__buf, size_t __nbytes);

	/* Write N bytes of BUF to FD. Return the number written, or -1.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t __wur write (int __fd, const void *__buf, size_t __n);


	/*
	* glibc APIs from <fcntl.h>
	*/

	/* Do the file control operation described by CMD on FD.
	The remaining arguments are interpreted depending on CMD.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int fcntl (int __fd, int __cmd, ...);


	/*
	* glibc APIs from <sys/select.h>
	*/

	/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
	readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
	(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
	after waiting the interval specified therein. Returns the number of ready
	descriptors, or -1 for errors.


	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	select (int __nfds, fd_set * __restrict __readfds,
	fd_set * __restrict __writefds,
	fd_set * __restrict __exceptfds,
	struct timeval *__restrict __timeout);

	#ifdef __USE_XOPEN2K
	/* Same as above only that the TIMEOUT value is given with higher
	resolution and a sigmask which is been set temporarily. This version
	should be used.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	pselect (int __nfds, fd_set * __restrict __readfds,
	fd_set * __restrict __writefds,
	fd_set * __restrict __exceptfds,
	const struct timespec *__restrict __timeout,
	const __sigset_t * __restrict __sigmask);
	#endif


	/*
	*
	* Socket specific glibc api
	*
	*/

	/*
	* glibc APIs from <sys/socket.h>
	*/

	/* Create a new socket of type TYPE in domain DOMAIN, using
	protocol PROTOCOL. If PROTOCOL is zero, one is chosen automatically.
	Returns a file descriptor for the new socket, or -1 for errors. */
	extern int __THROW socket (int __domain, int __type, int __protocol);

	/* Create two new sockets, of type TYPE in domain DOMAIN and using
	protocol PROTOCOL, which are connected to each other, and put file
	descriptors for them in FDS[0] and FDS[1]. If PROTOCOL is zero,
	one will be chosen automatically. Returns 0 on success, -1 for errors. */
	extern int __THROW
	socketpair (int __domain, int __type, int __protocol, int __fds[2]);

	/* Give the socket FD the local address ADDR (which is LEN bytes long). */
	extern int __THROW
	bind (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len);

	/* Put the local address of FD into ADDR and its length in LEN. */
	extern int __THROW
	getsockname (int __fd, __SOCKADDR_ARG __addr, socklen_t * __restrict __len);

	/* Open a connection on socket FD to peer at ADDR (which LEN bytes long).
	For connectionless socket types, just set the default address to send to
	and the only address from which to accept transmissions.
	Return 0 on success, -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int connect (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len);

	/* Put the address of the peer connected to socket FD into *ADDR
	(which is LEN bytes long), and its actual length into LEN. */
	extern int __THROW
	getpeername (int __fd, __SOCKADDR_ARG __addr, socklen_t * __restrict __len);

	/* Send N bytes of BUF to socket FD. Returns the number sent or -1.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t send (int __fd, const void *__buf, size_t __n, int __flags);

	extern ssize_t sendfile (int __out_fd, int __in_fd, off_t * __offset,
	size_t __len);

	/* Read N bytes into BUF from socket FD.
	Returns the number read or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t recv (int __fd, void *__buf, size_t __n, int __flags);

	/* Read N bytes into BUF from socket FD with buffer overflow checking.
	Returns the number read or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t __recv_chk (int fd, void *buf, size_t n, size_t buflen,
	int flags);

	/* Send N bytes of BUF on socket FD to peer at address ADDR (which is
	ADDR_LEN bytes long). Returns the number sent, or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t
	sendto (int __fd, const void *__buf, size_t __n,
	int __flags, __CONST_SOCKADDR_ARG __addr, socklen_t __addr_len);

	/* Read N bytes into BUF through socket FD.
	If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
	the sender, and store the actual size of the address in *ADDR_LEN.
	Returns the number of bytes read or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t
	recvfrom (int __fd, void *__restrict __buf,
	size_t __n, int __flags,
	__SOCKADDR_ARG __addr, socklen_t * __restrict __addr_len);

	/* Send a message described MESSAGE on socket FD.
	Returns the number of bytes sent, or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t
	sendmsg (int __fd, const struct msghdr *__message, int __flags);

	#ifdef __USE_GNU
	/* Send a VLEN messages as described by VMESSAGES to socket FD.
	Returns the number of datagrams successfully written or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	sendmmsg (int __fd, struct mmsghdr *__vmessages,
	unsigned int __vlen, int __flags);
	#endif

	/* Receive a message as described by MESSAGE from socket FD.
	Returns the number of bytes read or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern ssize_t recvmsg (int __fd, struct msghdr *__message, int __flags);

	#ifdef __USE_GNU
	/* Receive up to VLEN messages as described by VMESSAGES from socket FD.
	Returns the number of messages received or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	recvmmsg (int __fd, struct mmsghdr *__vmessages,
	unsigned int __vlen, int __flags, struct timespec *__tmo);
	#endif


	/* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
	into OPTVAL (which is OPTLEN bytes long), and set OPTLEN to the value's
	actual length. Returns 0 on success, -1 for errors. */
	extern int __THROW
	getsockopt (int __fd, int __level, int __optname,
	void __restrict __optval, socklen_t __restrict __optlen);

	/* Set socket FD's option OPTNAME at protocol level LEVEL
	to *OPTVAL (which is OPTLEN bytes long).
	Returns 0 on success, -1 for errors. */
	extern int __THROW
	setsockopt (int __fd, int __level, int __optname,
	const void *__optval, socklen_t __optlen);

	/* Prepare to accept connections on socket FD.
	N connection requests will be queued before further requests are refused.
	Returns 0 on success, -1 for errors. */
	extern int __THROW listen (int __fd, int __n);

	/* Await a connection on socket FD.
	When a connection arrives, open a new socket to communicate with it,
	set ADDR (which is ADDR_LEN bytes long) to the address of the connecting
	peer and *ADDR_LEN to the address's actual length, and return the
	new socket's descriptor, or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	accept (int __fd, __SOCKADDR_ARG __addr, socklen_t * __restrict __addr_len);

	/* Similar to 'accept' but takes an additional parameter to specify flags.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	/* TBD: implemented later */
	extern int
	accept4 (int __fd, __SOCKADDR_ARG __addr,
	socklen_t * __restrict __addr_len, int __flags);

	/* Shut down all or part of the connection open on socket FD.
	HOW determines what to shut down:
	SHUT_RD = No more receptions;
	SHUT_WR = No more transmissions;
	SHUT_RDWR = No more receptions or transmissions.
	Returns 0 on success, -1 for errors. */
	extern int __THROW shutdown (int __fd, int __how);


	/*
	* glibc APIs from <sys/epoll.h>
	*/

	/* Creates an epoll instance. Returns an fd for the new instance.
	The "size" parameter is a hint specifying the number of file
	descriptors to be associated with the new instance. The fd
	returned by epoll_create() should be closed with close(). */
	extern int __THROW epoll_create (int __size);

	/* Same as epoll_create but with an FLAGS parameter. The unused SIZE
	parameter has been dropped. */
	extern int __THROW epoll_create1 (int __flags);

	/* Manipulate an epoll instance "epfd". Returns 0 in case of success,
	-1 in case of error ( the "errno" variable will contain the
	specific error code ) The "op" parameter is one of the EPOLL_CTL_*
	constants defined above. The "fd" parameter is the target of the
	operation. The "event" parameter describes which events the caller
	is interested in and any associated user data. */
	extern int __THROW
	epoll_ctl (int __epfd, int __op, int __fd, struct epoll_event *__event);

	#define EP_INT_MAX ((int)(~0U>>1))
	#define EP_MAX_EVENTS (EP_INT_MAX / sizeof(struct epoll_event))

	/* Wait for events on an epoll instance "epfd". Returns the number of
	triggered events returned in "events" buffer. Or -1 in case of
	error with the "errno" variable set to the specific error code. The
	"events" parameter is a buffer that will contain triggered
	events. The "maxevents" is the maximum number of events to be
	returned ( usually size of "events" ). The "timeout" parameter
	specifies the maximum wait time in milliseconds (-1 == infinite).

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	epoll_wait (int __epfd, struct epoll_event *__events,
	int __maxevents, int __timeout);

	/* Same as epoll_wait, but the thread's signal mask is temporarily
	and atomically replaced with the one provided as parameter.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int
	epoll_pwait (int __epfd, struct epoll_event *__events,
	int __maxevents, int __timeout, const __sigset_t * __ss);

	/* Poll the file descriptors described by the NFDS structures starting at
	FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
	an event to occur; if TIMEOUT is -1, block until an event occurs.
	Returns the number of file descriptors with events, zero if timed out,
	or -1 for errors.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);

	#ifdef __USE_GNU
	/* Like poll, but before waiting the threads signal mask is replaced
	with that specified in the fourth parameter. For better usability,
	the timeout value is specified using a TIMESPEC object.

	This function is a cancellation point and therefore not marked with
	__THROW. */
	extern int ppoll (struct pollfd *__fds, nfds_t __nfds,
	const struct timespec __timeout, const __sigset_t __ss);
	#endif


	#endif /* included_ldp_glibc_socket_h */

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/