diff options
Diffstat (limited to 'lib/libc/sys/connect.2')
| -rw-r--r-- | lib/libc/sys/connect.2 | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/lib/libc/sys/connect.2 b/lib/libc/sys/connect.2 index 165f537a94d..2f8e0c5a7ae 100644 --- a/lib/libc/sys/connect.2 +++ b/lib/libc/sys/connect.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: connect.2,v 1.29 2016/08/09 17:34:06 millert Exp $ +.\" $OpenBSD: connect.2,v 1.30 2016/08/18 22:29:02 millert Exp $ .\" $NetBSD: connect.2,v 1.8 1995/10/12 15:40:48 jtc Exp $ .\" .\" Copyright (c) 1983, 1993 @@ -30,7 +30,7 @@ .\" .\" @(#)connect.2 8.1 (Berkeley) 6/4/93 .\" -.Dd $Mdocdate: August 9 2016 $ +.Dd $Mdocdate: August 18 2016 $ .Dt CONNECT 2 .Os .Sh NAME @@ -104,6 +104,56 @@ If the connection or binding succeeds, 0 is returned. Otherwise a \-1 is returned, and a more specific error code is stored in .Va errno . +.Sh EXAMPLES +The following code connects to the host described by +.Fa name +and handles the case where +.Fn connect +is interrupted by a signal. +.Bd -literal -offset indent +#include <sys/socket.h> +#include <poll.h> +#include <errno.h> +#include <err.h> + +int +connect_wait(int s, const struct sockaddr *name, socklen_t namelen) +{ + struct pollfd pfd[1]; + int error = 0; + socklen_t len = sizeof(error); + + pfd[0].fd = s; + pfd[0].events = POLLOUT; + for (;;) { + if (poll(pfd, 1, -1) == -1) { + if (errno != EINTR) + return -1; + continue; + } + if (getsockopt(s, SOL_SOCKET, SO_ERROR, &error, &len) < 0) + return -1; + if (error != 0) + errno = error; + break; + } + return (error ? -1 : 0); +} + +\&... + +int retcode; + +\&... + +retcode = connect(s, name, namelen); +if (retcode == -1) { + if (errno == EINTR) + retcode = connect_wait(s, name, namelen); + if (retcode == -1) + err(1, "connect"); +} +.Ed .Sh ERRORS The .Fn connect |