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

System Functions (s and S) spt_readv(2)
NAME
spt_readv - Initiates thread-aware readv( ) 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_readv(
int filedes,
struct iovec *iov,
int iov_count);
PARAMETERS
See the readv(2) reference page.
DESCRIPTION
This is a thread-aware version of the readv() function. The file descriptor must be nonblocking
for this function to be thread-aware.
For C applications, a macro to map readv() to spt_readv() is available when you use the
#define SPT_THREAD_AWARE preprocessor directive before including spthread.h or when
you use an equivalent compiler command option to compile the application.
For C++ applications, an alias to map readv() to spt_readv() is available when you use the
#define SPT_THREAD_AWARE_PRAGMA preprocessor directive before including
spthread.h or when you use an equivalent compiler command option to compile the application.
RETURN VALUES
See the readv(2) reference page. The following also applies:
• The value of errno is never set to [EWOULDBLOCK] or [EAGAIN].
• If the file descriptor 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.
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