recv()

• recv() ist blocking. See synchrone Operation

int recv(int sockfd, void *buf, int len, int flags);

Parameters

• sockfd is the socket descriptor to read from
• buf is the buffer to read the information into
• len is the maximum length of the buffer
• flags can again be set to 0

return values

• recv() returns the number of bytes actually read into the buffer
• -1 on error (with errno set, accordingly).
• recv() can return 0. This can mean only one thing: the remote side has closed the connection on you! A return value of 0 is recv()’s way of letting you know this has occurred.