fixed signatures for several syscalls that return positive value in correct case

sysdeps/nacl/irt_syscalls.c

Index: sysdeps/nacl/irt_syscalls.c
diff --git a/sysdeps/nacl/irt_syscalls.c b/sysdeps/nacl/irt_syscalls.c
index 8c66eb05e224e1aa9e2b1c980363c79b703810a8..fa7bee3d29a9eae3e620a484b065066a9ea5dbda 100644
--- a/sysdeps/nacl/irt_syscalls.c
+++ b/sysdeps/nacl/irt_syscalls.c
@@ -305,9 +305,9 @@ int (*__nacl_irt_fstat) (int fd, struct nacl_abi_stat *);
 int (*__nacl_irt_stat) (const char *pathname, struct nacl_abi_stat *);
 int (*__nacl_irt_getdents) (int fd, struct dirent *, size_t count,
 			    size_t *nread);
-int (*__nacl_irt_socket) (int domain, int type, int protocol);
+int (*__nacl_irt_socket) (int domain, int type, int protocol, int *ret);
 int (*__nacl_irt_accept) (int sockfd, struct sockaddr *addr,
-                          socklen_t *addrlen);
+                          socklen_t *addrlen, int *ret);
 int (*__nacl_irt_bind) (int sockfd, const struct sockaddr *addr, socklen_t addrlen);
 int (*__nacl_irt_listen) (int sockfd, int backlog);
 int (*__nacl_irt_connect) (int sockfd, const struct sockaddr *addr,
@@ -324,25 +324,25 @@ int (*__nacl_irt_recvmsg) (int sockfd, struct msghdr *msg, int flags, int* ret);
 int (*__nacl_irt_recvfrom) (int sockfd, void *buf, size_t len, int flags,
                             struct sockaddr *dest_addr, socklen_t* addrlen, int* ret);
 
-int (*__nacl_irt_epoll_create) (int size);
+int (*__nacl_irt_epoll_create) (int size, int *ret);
 int (*__nacl_irt_epoll_ctl) (int epfd, int op, int fd,
                              struct epoll_event *event);
 int (*__nacl_irt_epoll_pwait) (int epfd, struct epoll_event *events,
-                                 int maxevents, int timeout,
-                                 const sigset_t *sigmask, size_t sigset_size);
+    int maxevents, int timeout, const sigset_t *sigmask, size_t sigset_size,
+	int *ret);
 int (*__nacl_irt_epoll_wait) (int epfd, struct epoll_event *events,
-                                int maxevents, int timeout);
+                                int maxevents, int timeout, int *ret);
 int (*__nacl_irt_poll) (struct pollfd *fds, nfds_t nfds,
-                          int timeout);
+                          int timeout, int *ret);
 int (*__nacl_irt_ppoll) (struct pollfd *fds, nfds_t nfds,
-                           const struct timespec *timeout,
-                           const sigset_t *sigmask, size_t sigset_size);
+    const struct timespec *timeout, const sigset_t *sigmask,
+	size_t sigset_size, int *ret);
 int (*__nacl_irt_select) (int nfds, fd_set *readfds,
-                                fd_set *writefds, fd_set *exceptfds,
-                                const struct timeval *timeout);
+    fd_set *writefds, fd_set *exceptfds, const struct timeval *timeout,
+	int *ret);
 int (*__nacl_irt_pselect) (int nfds, fd_set *readfds,
-                                fd_set *writefds, fd_set *exceptfds,
-                                const struct timeval *timeout, void* sigmask);
+    fd_set *writefds, fd_set *exceptfds, const struct timeval *timeout,
+	void* sigmask, int *ret);
 int (*__nacl_irt_getpeername) (int sockfd, struct sockaddr *addr,
                                socklen_t *addrlen);
 int (*__nacl_irt_getsockname) (int sockfd, struct sockaddr *addr,