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

spt_vprintf(2) OSS System Calls Reference Manual
NAME
spt_vprintf - Initiates thread-aware vprintf( ) function
LIBRARY
G-series native OSS processes: /G/system/sysnn/zsptsrl
H-series OSS processes: /G/system/zdllnnn/zsptdll
SYNOPSIS
#include <spthread.h>
int spt_vprintf(
const char *format,
va_list printarg);
PARAMETERS
See the vprintf(3) reference page either online or in the Open System Services Library Calls
Reference manual.
DESCRIPTION
This is a thread-aware version of the vprintf() function. The file descriptor underlying standard
output must be nonblocking for this function to be thread-aware.
The following macro maps spt_vprintf( ) to vprintf() and has been defined in spthread.h:
#define vprintf(format, printarg) spt_vprintf(format, printarg)
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 vprintf(3) reference page. The following also applies:
• The value of errno is never set to [EAGAIN] or [EWOULDBLOCK].
• If the file descriptor underlying stdout becomes invalid (is closed by
another thread), -1 is returned with an errno value 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].
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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