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Receives bytes from a socket and stores the sending peer's address.


#include <prio.h> 

PRInt32 PR_RecvFrom(
  PRFileDesc *fd, 
  void *buf, 
  PRInt32 amount,
  PRIntn flags, 
  PRNetAddr *addr,
  PRIntervalTime timeout);


The function has the following parameters:

A pointer to a PRFileDesc object representing a socket.
A pointer to a buffer containing the data received.
The size of buf (in bytes).
This obsolete parameter must always be zero.
A pointer to the PRNetAddr object that will be filled in with the address of the sending peer on return.
A value of type PRIntervalTime specifying the time limit for completion of the receive operation.


The function returns one of the following values:

  • A positive number indicates the number of bytes actually received.
  • The value 0 means the network connection is closed.
  • The value -1 indicates a failure. The reason for the failure can be obtained by calling PR_GetError.


PR_RecvFrom receives up to a specified number of bytes from socket, which may or may not be connected. The operation blocks until one or more bytes are transferred, a timeout has occurred, or there is an error. No more than amount bytes will be transferred. PR_RecvFrom is usually used with a UDP socket.

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Contributors to this page: teoli, alecananian
Last updated by: teoli,