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

System Functions (s and S) spt_getwc(2)
NAME
spt_getwc - Initiates thread-aware getwc( ) function
LIBRARY
G-series native OSS processes: /G/system/sysnn/zsptsrl
H-series OSS processes: /G/system/zdllnnn/zsptdll
SYNOPSIS
#include <spthread.h>
wint_t spt_getwc(
FILE *stream);
PARAMETERS
See the getwc(3) reference page either online or in the Open System Services Library Calls
Refrence Manual.
DESCRIPTION
This is a thread-aware version of the getwc( ) function. The file descriptor underlying the stream
must be nonblocking for this function to be thread aware.
The following macro maps spt_getwc() to etwc() and has been defined in spthread.h:
#define getwc(stream) spt_getwc(stream)
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 getwc(3) reference page. The following also applies:
• The value of errno is never set to [EAGAIN] or [EWOULDBLOCK].
• If the file descriptor underlying stream becomes invalid (is closed by another thread),
EOF is returned with an errno of [EBADF].
• If a signal is received via the pthread_kill() function and is not blocked, ignored, or
handled, EOF 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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