X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Funix.c;h=37bb1a711ca26d1c17c0db9953651c81449867d8;hb=664ab72cc87f316602efe683ddaa8c53003eedd4;hp=a87ce05ed581cc6cb1d14788956a6ca0d64cdb38;hpb=aa678e506230fdc6f9f3a6db6e8188ae3bb64e40;p=lttng-tools.git

diff --git a/src/common/unix.c b/src/common/unix.c
index a87ce05ed..37bb1a711 100644
--- a/src/common/unix.c
+++ b/src/common/unix.c
@@ -220,6 +220,9 @@ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
  * Receive data of size len in put that data into the buf param. Using recvmsg
  * API. Only use with sockets set in non-blocking mode.
  *
+ * NOTE: EPIPE errors are NOT reported. This call expects the socket to be in a
+ * poll set. The poll loop will handle the EPIPE original cause.
+ *
  * Return the size of received data.
  */
 LTTNG_HIDDEN
@@ -243,13 +246,20 @@ retry:
 			goto retry;
 		} else {
 			/*
-			 * Only warn about EPIPE when quiet mode is
-			 * deactivated.
-			 * We consider EPIPE as expected.
+			 * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected.
 			 */
-			if (errno != EPIPE || !lttng_opt_quiet) {
-				PERROR("recvmsg");
+			if (errno == EAGAIN || errno == EWOULDBLOCK ||
+					errno == EPIPE) {
+				/*
+				 * Nothing was recv.
+				 */
+				ret = 0;
+				goto end;
 			}
+
+			/* Unexpected error */
+			PERROR("recvmsg");
+			ret = -1;
 			goto end;
 		}
 	}
@@ -308,6 +318,9 @@ end:
  * of the function is that this one does not retry to send on partial sends,
  * except if the interruption was caused by a signal (EINTR).
  *
+ * NOTE: EPIPE errors are NOT reported. This call expects the socket to be in a
+ * poll set. The poll loop will handle the EPIPE original cause.
+ *
  * Return the size of sent data.
  */
 LTTNG_HIDDEN
@@ -331,13 +344,21 @@ retry:
 			goto retry;
 		} else {
 			/*
-			 * Only warn about EPIPE when quiet mode is
-			 * deactivated.
-			 * We consider EPIPE as expected.
+			 * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected.
 			 */
-			if (errno != EPIPE || !lttng_opt_quiet) {
-				PERROR("sendmsg");
+			if (errno == EAGAIN || errno == EWOULDBLOCK ||
+					errno == EPIPE) {
+				/*
+				 * This can happen in non blocking mode.
+				 * Nothing was sent.
+				 */
+				ret = 0;
+				goto end;
 			}
+
+			/* Unexpected error */
+			PERROR("sendmsg");
+			ret = -1;
 			goto end;
 		}
 	}
@@ -441,8 +462,14 @@ ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
 	struct cmsghdr *cmsg;
 	size_t sizeof_fds = nb_fd * sizeof(int);
 
-	/* Account for the struct ucred cmsg in the buffer size */
-	char recv_buf[CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred))];
+#ifdef __linux__
+/* Account for the struct ucred cmsg in the buffer size */
+#define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred))
+#else
+#define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds)
+#endif /* __linux__ */
+
+	char recv_buf[LTTNG_SOCK_RECV_FDS_BUF_SIZE];
 	struct msghdr msg;
 	char dummy;
 
@@ -490,11 +517,6 @@ ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
 	 * message.
 	 */
 	for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-		if (!cmsg) {
-			fprintf(stderr, "Error: Invalid control message header\n");
-			ret = -1;
-			goto end;
-		}
 		if (cmsg->cmsg_level != SOL_SOCKET) {
 			fprintf(stderr, "Error: The socket needs to be of type SOL_SOCKET\n");
 			ret = -1;
@@ -517,6 +539,7 @@ ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
 			ret = sizeof_fds;
 			goto end;
 		}
+#ifdef __linux__
 		if (cmsg->cmsg_type == SCM_CREDENTIALS) {
 			/*
 			 * Expect credentials to be sent when expecting fds even
@@ -525,6 +548,7 @@ ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
 			 */
 			ret = -1;
 		}
+#endif /* __linux__ */
 	}
 end:
 	return ret;