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HP 9000 Networking: BSD Sockets Interface Programmer's Guide > Chapter 3 Advanced Topics for Stream SocketsNonblocking I/O |
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Sockets are created in blocking mode I/O by default. You can specify that a socket be put in nonblocking mode by using the ioctl system call with the FIOSNBIO request. Here is an example:
arg is a pointer to int:
If a socket is in nonblocking mode, the following calls are affected:
The O_NDELAY flag for fcntl(2) is also supported. If you use this flag and there are no data available to be received on a recv, recvfrom , recvmsg, or read call, the call returns immediately with the value of 0. If you use the O_NONBLOCK flag, the call returns immediately with the value of -1 and the EAGAIN error. This is the same as returning an end-of-file condition. This is also true for send, sendto, sendmsg, and write if there is not enough buffer space to complete the send.
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