UNIX Network Programming Reading Notes: recv and send Functions

These two functions are similar to the standard read and write Functions, but an additional parameter is required.

# Include <sys/socket. h> sockfd, * buff, size_t nbytes, sockfd, * buff, size_t nbytes, --- Error

The first three parameters of recv and send are equivalent to the three parameters of read and write. The value of the flags parameter is either 0 or a logical or of one or more common values listed.

Flags	Description	Recv	Send
MSG_DONTROUTE MSG_DONTWAIT MSG_OOB MSG_PEEK MSG_WAITALL	Bypassing route table search This operation is not blocked only. Send or receive out-of-band data View External messages (recv and recvfrom) Waiting for all data (nbytes)