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

spt_read(2) OSS System Calls Reference Manual
NAME
spt_read - Initiates thread-aware read( ) 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_read(
int filedes,
void *buffer,
size_t nbytes);
PARAMETERS
See the read(2) reference page.
DESCRIPTION
This is a thread-aware version of the read( function. Note that file descriptor must be nonblock-
ing for this function to be thread-aware.
The following macro maps spt_read() to read() and has been defined in spthread.h:
#define read(filedes, buffer, nbytes) \
spt_read((filedes), (buffer), (nbytes))
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 read(2) reference page. The following also applies:
• The value of errno is never set to [EWOULDBLOCK] or [EAGAIN].
• If the file descriptor becomes invalid (for example, 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.
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