Open System Services System Calls Reference Manual (G06.25+, H06.03+)

System Functions (s and S) spt_recvfrom(2)
NAME
spt_recvfrom - Initiates thread-aware recvfrom( ) function
LIBRARY
G-series native OSS processes: /G/system/sysnn/zsptsrl
H-series OSS processes: /G/system/zdllnnn/zsptdll
SYNOPSIS
#include <spthread.h>
ssize_t spt_recvfrom(
int socket,
void *buffer,
size_t length,
int flags,
struct sockaddr *address,
size_t *address_len);
PARAMETERS
See the recvfrom(2) reference page.
DESCRIPTION
This is a thread-aware version of the recvfrom() function. The socket must be nonblocking for
this function to be thread-aware.
The following macro maps spt_recvfrom() to recvfrom() and has been defined in spthread.h:
#define recvfrom(socket, buffer, length, flags, address, address_len)\
spt_recvfrom(socket, buffer, length, flags, address, address_len)
This macro is available only when SPT_THREAD_AWARE has been defined before including
spthread.h, as follows:
#define SPT_THREAD_AWARE
RETURN VALUES
See the recvfrom(2) reference page. The following also applies:
• The value of errno is never set to [EWOULDBLOCK].
• If the socket becomes invalid (is closed by another thread), -1 is returned with an errno
of [EBADF].
• If a signal is received via the pthread_kill() function and is not blocked, ignored, or
handled, -1 is returned with an errno of [EINTR].
STANDARDS CONFORMANCE
This function is an extension to the XPG4 Version 2 specification. Interfaces documented on this
reference page conform to the following industry standards:
• IEEE Std 1003.1c-1995, POSIX System Application Program Interface
The use of the header file spthread.h is an HP exception to the POSIX standard.
527186-003 Hewlett-Packard Company 7−127