socket-util: Remove get_socket_error().

[openvswitch] / lib / socket-util.c

diff --git a/lib/socket-util.c b/lib/socket-util.c
index 314761d388adf7c08c645f1d5937bec0eacd3a24..48f42f195c6b0b45e03a5703c91a3d7490fc9a23 100644 (file)
--- a/lib/socket-util.c
+++ b/lib/socket-util.c
@@ -30,6 +30,7 @@
 #include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
+#include <sys/uio.h>
 #include <sys/un.h>
 #include <unistd.h>
 #include "dynamic-string.h"
@@ -38,7 +39,7 @@
 #include "poll-loop.h"
 #include "util.h"
 #include "vlog.h"
-#if AF_PACKET && __linux__
+#if AF_PACKET && LINUX_DATAPATH
 #include <linux/if_packet.h>
 #endif
 #ifdef HAVE_NETLINK
@@ -50,11 +51,9 @@ VLOG_DEFINE_THIS_MODULE(socket_util);
 
 /* #ifdefs make it a pain to maintain code: you have to try to build both ways.
  * Thus, this file compiles all of the code regardless of the target, by
- * writing "if (LINUX)" instead of "#ifdef __linux__". */
-#ifdef __linux__
-#define LINUX 1
-#else
-#define LINUX 0
+ * writing "if (LINUX_DATAPATH)" instead of "#ifdef __linux__". */
+#ifndef LINUX_DATAPATH
+#define LINUX_DATAPATH 0
 #endif
 
 #ifndef O_DIRECTORY
@@ -91,7 +90,7 @@ xset_nonblocking(int fd)
     }
 }
 
-static int
+int
 set_dscp(int fd, uint8_t dscp)
 {
     int val;
@@ -206,22 +205,10 @@ lookup_hostname(const char *host_name, struct in_addr *addr)
             : EINVAL);
 }
 
-/* Returns the error condition associated with socket 'fd' and resets the
- * socket's error status. */
-int
-get_socket_error(int fd)
-{
-    int error;
-
-    if (getsockopt_int(fd, SOL_SOCKET, SO_ERROR, "SO_ERROR", &error)) {
-        error = errno;
-    }
-    return error;
-}
-
 int
 check_connection_completion(int fd)
 {
+    static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
     struct pollfd pfd;
     int retval;
 
@@ -231,9 +218,17 @@ check_connection_completion(int fd)
         retval = poll(&pfd, 1, 0);
     } while (retval < 0 && errno == EINTR);
     if (retval == 1) {
-        return get_socket_error(fd);
+        if (pfd.revents & POLLERR) {
+            ssize_t n = send(fd, "", 1, MSG_DONTWAIT);
+            if (n < 0) {
+                return errno;
+            } else {
+                VLOG_ERR_RL(&rl, "poll return POLLERR but send succeeded");
+                return EPROTO;
+            }
+        }
+        return 0;
     } else if (retval < 0) {
-        static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
         VLOG_ERR_RL(&rl, "poll: %s", strerror(errno));
         return errno;
     } else {
@@ -265,7 +260,7 @@ drain_rcvbuf(int fd)
          *
          * On other Unix-like OSes, MSG_TRUNC has no effect in the flags
          * argument. */
-        char buffer[LINUX ? 1 : 2048];
+        char buffer[LINUX_DATAPATH ? 1 : 2048];
         ssize_t n_bytes = recv(fd, buffer, sizeof buffer,
                                MSG_TRUNC | MSG_DONTWAIT);
         if (n_bytes <= 0 || n_bytes >= rcvbuf) {
@@ -334,7 +329,7 @@ make_sockaddr_un(const char *name, struct sockaddr_un *un, socklen_t *un_len,
     if (strlen(name) > MAX_UN_LEN) {
         static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
 
-        if (LINUX) {
+        if (LINUX_DATAPATH) {
             /* 'name' is too long to fit in a sockaddr_un, but we have a
              * workaround for that on Linux: shorten it by opening a file
              * descriptor for the directory part of the name and indirecting
@@ -613,6 +608,7 @@ exit:
         }
     } else if (fd >= 0) {
         close(fd);
+        fd = -1;
     }
     *fdp = fd;
     return error;
@@ -892,6 +888,14 @@ xpipe(int fds[2])
     }
 }
 
+void
+xpipe_nonblocking(int fds[2])
+{
+    xpipe(fds);
+    xset_nonblocking(fds[0]);
+    xset_nonblocking(fds[1]);
+}
+
 void
 xsocketpair(int domain, int type, int protocol, int fds[2])
 {
@@ -979,7 +983,7 @@ describe_sockaddr(struct ds *string, int fd,
             }
         }
 #endif
-#if AF_PACKET && __linux__
+#if AF_PACKET && LINUX_DATAPATH
         else if (ss.ss_family == AF_PACKET) {
             struct sockaddr_ll sll;
 
@@ -1009,7 +1013,7 @@ describe_sockaddr(struct ds *string, int fd,
 }
 
 
-#ifdef __linux__
+#ifdef LINUX_DATAPATH
 static void
 put_fd_filename(struct ds *string, int fd)
 {
@@ -1053,7 +1057,7 @@ describe_fd(int fd)
                               : S_ISFIFO(s.st_mode) ? "FIFO"
                               : S_ISLNK(s.st_mode) ? "symbolic link"
                               : "unknown"));
-#ifdef __linux__
+#ifdef LINUX_DATAPATH
         put_fd_filename(&string, fd);
 #endif
     }