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#ifndef __TEST_SOCKETS_MSG_H__
#define __TEST_SOCKETS_MSG_H__
typedef struct {
char *buffer;
int length;
} msg_t;
int do_msg_read(int sockfd, msg_t *msg, int offset, int length, struct sockaddr *addr, socklen_t *addrlen) {
int res;
if (!msg->length) {
// read the message length
res = recvfrom(sockfd, &msg->length, sizeof(int), 0, addr, addrlen);
if (res == -1) {
assert(errno == EAGAIN);
return res;
} else if (res == 0) {
return 0;
}
printf("do_msg_read: allocating %d bytes for message\n", msg->length);
msg->buffer = malloc(msg->length);
}
// read the actual message
int max = msg->length - offset;
if (length && max > length) {
max = length;
}
res = recvfrom(sockfd, msg->buffer + offset, max, 0, addr, addrlen);
if (res == -1) {
assert(errno == EAGAIN);
return res;
}
printf("do_msg_read: read %d bytes\n", res);
return res;
}
int do_msg_write(int sockfd, msg_t *msg, int offset, int length, struct sockaddr *addr, socklen_t addrlen) {
int res;
// send the message length first
if (!offset) {
if (addr) {
res = sendto(sockfd, &msg->length, sizeof(int), 0, addr, addrlen);
} else {
res = send(sockfd, &msg->length, sizeof(int), 0);
}
if (res == -1) {
assert(errno == EAGAIN);
return res;
}
printf("do_msg_write: sending message header for %d bytes\n", msg->length);
assert(res == sizeof(int));
}
// then the actual message
int max = msg->length - offset;
if (length && max > length) {
max = length;
}
if (addr) {
res = sendto(sockfd, msg->buffer + offset, max, 0, addr, addrlen);
} else {
res = send(sockfd, msg->buffer + offset, max, 0);
}
if (res == -1) {
assert(errno == EAGAIN);
return res;
}
printf("do_msg_write: wrote %d bytes %d\n", res, msg->length);
return res;
}
#endif
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