Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

System Functions (s and S) spt_sendmsg(2)
NAME
spt_sendmsg - Initiates thread-aware sendmsg( ) function
LIBRARY
G-series native OSS processes: /G/system/sysnn/zsptsrl
H-series OSS processes: /G/system/zdllnnn/zsptdll
SYNOPSIS
#define _XOPEN_SOURCE_EXTENDED 1
#include <spthread.h>
ssize_t spt_sendmsg(
int socket,
const struct msghdr *message,
int flags);
PARAMETERS
See the sendmsg(2) reference page.
DESCRIPTION
This is a thread-aware version of the sendmsg( ) function. The socket must be nonblocking for
this function to be thread-aware.
This function requires that the feature-test macro _XOPEN_SOURCE_EXTENDED be specified
when you compile the module.
The following macro maps spt_sendmsg() to sendmsg() and has been defined in spthread.h:
#define sendmsg(socket, message, flags)\
spt_sendmsg(socket, message, flags)
This macro is available only when SPT_THREAD_AWARE has been defined before including
spthread.h, as follows:
#define SPT_THREAD_AWARE
For more description and notes the sendmsg(2) reference page.
RETURN VALUES
See the sendmsg(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 value of [EINTR].
ERRORS
See the sendmsg(2) reference page.
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.
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