Print errno name for posix sockets

Errno numbers are not consistent across platforms, and it makes it
confusing when debugging errno tests across plaforms, for example
ECONNRESET is 108 in Windows kit and 104 in Linux.

b/321999529

Change-Id: Ie46505ea50979446b1ef128d34b6487a304e2d4b

starboard/nplb/posix_compliance/posix_socket_send_test.cc

@@ -17,6 +17,7 @@
 
 #include <fcntl.h>
 #include <pthread.h>
+#include <string.h>
 #include <unistd.h>
 #include "starboard/nplb/posix_compliance/posix_socket_helpers.h"
 #include "starboard/thread.h"
@@ -78,7 +79,7 @@ TEST(PosixSocketSendTest, RainyDayUnconnectedSocket) {
 
   EXPECT_TRUE(errno == ECONNRESET || errno == ENETRESET || errno == EPIPE ||
               errno == ENOTCONN);
-  SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+  SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
 
   EXPECT_TRUE(close(socket_fd) == 0);
 }
@@ -111,10 +112,11 @@ TEST(PosixSocketSendTest, RainyDaySendToClosedSocket) {
   EXPECT_TRUE(pthread_join(send_thread, &thread_result) == 0);
 
   EXPECT_TRUE(errno == ECONNRESET || errno == ENETRESET || errno == EPIPE ||
-              errno == ENOTCONN ||  // errno on Windows
-              errno == EINPROGRESS  // errno on Evergreen
+              errno == ENOTCONN ||     // errno on Windows
+              errno == EINPROGRESS ||  // errno on Evergreen
+              errno == ENETUNREACH     // errno on raspi
   );
-  SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+  SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
 
   // Clean up the server socket.
   EXPECT_TRUE(close(server_socket_fd) == 0);
@@ -149,7 +151,7 @@ TEST(PosixSocketSendTest, RainyDaySendToSocketUntilBlocking) {
       // If we didn't get a socket, it should be pending.
       EXPECT_TRUE(errno == EINPROGRESS || errno == EAGAIN ||
                   errno == EWOULDBLOCK);
-      SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+      SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
       break;
     }
 
@@ -201,7 +203,7 @@ TEST(PosixSocketSendTest, RainyDaySendToSocketConnectionReset) {
     if (result < 0) {
       EXPECT_TRUE(errno == ECONNRESET || errno == ENETRESET || errno == EPIPE ||
                   errno == ECONNABORTED);
-      SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+      SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
       break;
     }
 

starboard/nplb/posix_compliance/posix_socket_sendto_test.cc

@@ -17,6 +17,7 @@
 
 #include <fcntl.h>
 #include <pthread.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "starboard/nplb/posix_compliance/posix_socket_helpers.h"
@@ -81,7 +82,7 @@ TEST(PosixSocketSendtoTest, RainyDayUnconnectedSocket) {
 
   EXPECT_TRUE(errno == ECONNRESET || errno == ENETRESET || errno == EPIPE ||
               errno == ENOTCONN);
-  SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+  SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
 
   EXPECT_TRUE(close(socket_fd) == 0);
 }
@@ -114,10 +115,11 @@ TEST(PosixSocketSendtoTest, RainyDaySendToClosedSocket) {
   EXPECT_TRUE(pthread_join(send_thread, &thread_result) == 0);
 
   EXPECT_TRUE(errno == ECONNRESET || errno == ENETRESET || errno == EPIPE ||
-              errno == ENOTCONN ||  // errno on Windows
-              errno == EINPROGRESS  // errno on Evergreen
+              errno == ENOTCONN ||     // errno on Windows
+              errno == EINPROGRESS ||  // errno on Evergreen
+              errno == ENETUNREACH     // errno on raspi
   );
-  SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+  SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
 
   // Clean up the server socket.
   EXPECT_TRUE(close(server_socket_fd) == 0);
@@ -152,7 +154,7 @@ TEST(PosixSocketSendtoTest, RainyDaySendToSocketUntilBlocking) {
       // If we didn't get a socket, it should be pending.
       EXPECT_TRUE(errno == EINPROGRESS || errno == EAGAIN ||
                   errno == EWOULDBLOCK);
-      SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+      SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
       break;
     }
 
@@ -200,7 +202,7 @@ TEST(PosixSocketSendtoTest, RainyDaySendToSocketConnectionReset) {
     if (result < 0) {
       EXPECT_TRUE(errno == ECONNRESET || errno == ENETRESET || errno == EPIPE ||
                   errno == ECONNABORTED);
-      SB_DLOG(INFO) << "Failed to send, errno = " << errno;
+      SB_DLOG(INFO) << "Failed to send, errno = " << strerror(errno);
       break;
     }
 

starboard/shared/win32/posix_emu/socket.cc

@@ -15,7 +15,8 @@
 // We specifically do not include <sys/socket.h> since the define causes a loop
 
 #include <fcntl.h>
-#include <io.h>      // Needed for file-specific `_close`.
+#include <io.h>  // Needed for file-specific `_close`.
+#include <string.h>
 #include <unistd.h>  // Our version that declares generic `close`.
 #include <winsock2.h>
 #undef NO_ERROR  // http://b/302733082#comment15
@@ -223,7 +224,7 @@ static void set_errno() {
   }
 
   _set_errno(sockError);
-  SB_DLOG(INFO) << "Encounter socket error: " << sockError;
+  SB_DLOG(INFO) << "Encounter socket error: " << strerror(sockError);
 }
 
 ///////////////////////////////////////////////////////////////////////////////