added several system call hooks for future sockets implementation

sysdeps/nacl/irt_syscalls.h

Index: sysdeps/nacl/irt_syscalls.h
diff --git a/sysdeps/nacl/irt_syscalls.h b/sysdeps/nacl/irt_syscalls.h
index ac4fd6439bab39498dfb42d61db63abd9f40d912..b68c413f8f147967bc9ce5cbe8f0f7daeb7b2747 100644
--- a/sysdeps/nacl/irt_syscalls.h
+++ b/sysdeps/nacl/irt_syscalls.h
@@ -2,6 +2,8 @@
 #define _IRT_SYSCALLS_H
 
 #include <sys/types.h>
+#include <sys/epoll.h>
+#include <poll.h>
 #include <stddef.h>
 #include <fcntl.h>
 #include <time.h>
@@ -12,6 +14,8 @@ struct dirent;
 struct nacl_abi_stat;
 struct timeval;
 struct timespec;
+struct sockaddr;
+#define socklen_t unsigned int
 
 extern size_t (*__nacl_irt_query)(const char *interface_ident,
                                   void *table, size_t tablesize);
@@ -29,6 +33,38 @@ extern int (*__nacl_irt_rmdir) (const char* pathname);
 extern int (*__nacl_irt_chdir) (const char* pathname);
 extern int (*__nacl_irt_getcwd) (char* buf, size_t size, int* ret);
 
+extern int (*__nacl_irt_epoll_create) (int flags); // size
+extern int (*__nacl_irt_epoll_create1 )(int flags);
+extern int (*__nacl_irt_epoll_ctl) (int epfd, int op, int fd, struct epoll_event *event);
+extern int (*__nacl_irt_epoll_pwait) (int epfd, struct epoll_event *events,
+                                  int maxevents, int timeout,
+                                  const sigset_t *sigmask, size_t sigsetsize);
+extern int (*__nacl_irt_epoll_wait) (int epfd, struct epoll_event *events,
+                                 int maxevents, int timeout);
+extern int (*__nacl_irt_poll) (struct pollfd *fds, nfds_t nfds,
+                           int timeout);
+extern int (*__nacl_irt_ppoll) (struct pollfd *fds, nfds_t nfds,
+                            const struct timespec *timeout,
+                            const sigset_t *sigmask, size_t sigsetsize);
+extern int (*__nacl_irt_socket) (int domain, int type, int protocol);
+extern int (*__nacl_irt_accept) (int sockfd, struct sockaddr *addr, socklen_t *addrlen);
+extern int (*__nacl_irt_bind) (int sockfd, struct sockaddr *addr, socklen_t addrlen);
+extern int (*__nacl_irt_listen) (int sockfd, int backlog);
+extern int (*__nacl_irt_connect) (int sockfd, struct sockaddr *addr, socklen_t *addrlen);
+extern int (*__nacl_irt_send) (int sockfd, const void *buf, size_t len, int flags);
+extern int (*__nacl_irt_sendto) (int sockfd, const void *buf, size_t len, int flags,
+                                 const struct sockaddr *dest_addr, socklen_t addrlen);
+extern int (*__nacl_irt_recv) (int sockfd, void *buf, size_t len, int flags);
+extern int (*__nacl_irt_recvfrom) (int sockfd, void *buf, size_t len, int flags,
+                                 struct sockaddr *dest_addr, socklen_t addrlen);
+extern int (*__nacl_irt_select) (int nfds, fd_set *readfds,
+                                 fd_set *writefds, fd_set *exceptfds,
+                                 const struct timeval *timeout);
+extern int (*__nacl_irt_pselect) (int nfds, fd_set *readfds,
+                                 fd_set *writefds, fd_set *exceptfds,
+                                 const struct timeval *timeout, void* sigmask);
+
+
 extern int (*__nacl_irt_open) (const char *pathname, int oflag, mode_t cmode,
                                int *newfd);
 extern int (*__nacl_irt_close) (int fd);
@@ -81,6 +117,7 @@ extern int (*__nacl_irt_open_resource) (const char* file, int *fd);
 
 extern int (*__nacl_irt_clock_getres) (clockid_t clk_id, struct timespec *res);
 extern int (*__nacl_irt_clock_gettime) (clockid_t clk_id, struct timespec *tp);
+#undef socklen_t
 
 #ifdef _LIBC
 void init_irt_table (void) attribute_hidden;
@@ -115,7 +152,6 @@ void init_irt_table (void) attribute_hidden;
 #include <sys/poll.h>
 #include <sys/ptrace.h>
 #include <sys/times.h>
-#include <sys/types.h>
 #include <sys/wait.h>
 #include <time.h>
 #include <utime.h>