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[svn] Document connect_to_host better.

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This commit is contained in:
hniksic 2003-11-17 15:53:14 -08:00
parent ac1d8e5078
commit b61d05160b
1 changed files with 41 additions and 34 deletions
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75
src/connect.c
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@ -241,7 +241,10 @@ connect_with_timeout (int fd, const struct sockaddr *addr, socklen_t addrlen,
return ctx.result; return ctx.result;
} }
/* Connect to a remote endpoint whose IP address is known. */ /* Connect via TCP to the specified address and port.
If PRINT is non-NULL, it is the host name to print that we're
connecting to. */
int int
connect_to_ip (const ip_address *ip, int port, const char *print) connect_to_ip (const ip_address *ip, int port, const char *print)
@ -326,7 +329,11 @@ connect_to_ip (const ip_address *ip, int port, const char *print)
} }
} }
/* Connect to a remote endpoint specified by host name. */ /* Connect via TCP to a remote host on the specified port.
HOST is resolved as an Internet host name. If HOST resolves to
more than one IP address, they are tried in the order returned by
DNS until connecting to one of them succeeds. */
int int
connect_to_host (const char *host, int port) connect_to_host (const char *host, int port)
@ -373,38 +380,7 @@ connect_to_host (const char *host, int port)
return -1; return -1;
} }
int
test_socket_open (int sock)
{
#ifdef HAVE_SELECT
fd_set check_set;
struct timeval to;
/* Check if we still have a valid (non-EOF) connection. From Andrew
* Maholski's code in the Unix Socket FAQ. */
FD_ZERO (&check_set);
FD_SET (sock, &check_set);
/* Wait one microsecond */
to.tv_sec = 0;
to.tv_usec = 1;
/* If we get a timeout, then that means still connected */
if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
{
/* Connection is valid (not EOF), so continue */
return 1;
}
else
return 0;
#else
/* Without select, it's hard to know for sure. */
return 1;
#endif
}
/* Create a socket, bind it to local interface BIND_ADDRESS on port /* Create a socket, bind it to local interface BIND_ADDRESS on port
*PORT, set up a listen backlog, and return the resulting socket, or *PORT, set up a listen backlog, and return the resulting socket, or
-1 in case of error. -1 in case of error.
@ -682,6 +658,37 @@ select_fd (int fd, double maxtime, int wait_for)
#endif /* not HAVE_SELECT */ #endif /* not HAVE_SELECT */
} }
int
test_socket_open (int sock)
{
#ifdef HAVE_SELECT
fd_set check_set;
struct timeval to;
/* Check if we still have a valid (non-EOF) connection. From Andrew
* Maholski's code in the Unix Socket FAQ. */
FD_ZERO (&check_set);
FD_SET (sock, &check_set);
/* Wait one microsecond */
to.tv_sec = 0;
to.tv_usec = 1;
/* If we get a timeout, then that means still connected */
if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
{
/* Connection is valid (not EOF), so continue */
return 1;
}
else
return 0;
#else
/* Without select, it's hard to know for sure. */
return 1;
#endif
}
/* Basic socket operations, mostly EINTR wrappers. */ /* Basic socket operations, mostly EINTR wrappers. */