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socket: simplify receiving messages

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Don't require the caller to provide a SCK_Message (on stack). Modify the
SCK_ReceiveMessage*() functions to return a pointer to static buffers,
as the message buffer which SCK_Message points to already is.
This commit is contained in:
Miroslav Lichvar
2020-03-24 15:22:31 +01:00
parent b8b751a932
commit b20ef4cd7f
6 changed files with 62 additions and 51 deletions
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14
socket.h
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@@ -41,9 +41,6 @@
#define SCK_FLAG_MSG_ERRQUEUE 1
#define SCK_FLAG_MSG_DESCRIPTOR 2
/* Maximum number of received messages */
#define SCK_MAX_RECV_MESSAGES 4
typedef enum {
SCK_ADDR_UNSPEC = 0,
SCK_ADDR_IP,
@@ -119,12 +116,11 @@ extern int SCK_ShutdownConnection(int sock_fd);
extern int SCK_Receive(int sock_fd, void *buffer, unsigned int length, int flags);
extern int SCK_Send(int sock_fd, const void *buffer, unsigned int length, int flags);
/* Receive a single message or multiple messages. The functions return the
number of received messages, or 0 on error. The returned data point to
static buffers, which are valid until another call of these functions. */
extern int SCK_ReceiveMessage(int sock_fd, SCK_Message *message, int flags);
extern int SCK_ReceiveMessages(int sock_fd, SCK_Message *messages, int max_messages,
int flags);
/* Receive a single message or multiple messages. The functions return
a pointer to static buffers, or NULL on error. The buffers are valid until
another call of the functions and can be reused for sending messages. */
extern SCK_Message *SCK_ReceiveMessage(int sock_fd, int flags);
extern SCK_Message *SCK_ReceiveMessages(int sock_fd, int flags, int *num_messages);
/* Initialise a new message (e.g. before sending) */
extern void SCK_InitMessage(SCK_Message *message, SCK_AddressType addr_type);