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

spt_fgetc(2) OSS System Calls Reference Manual
NAME
spt_fgetc - Initiates thread-aware fgetc( ) 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_fgetc(
FILE *stream);
PARAMETERS
See the fgetc(3) reference page either online or in the Guardian C Native Library Calls Refer-
ence Manual.
DESCRIPTION
Thread-aware fgetc(3). The file descriptor underlying the stream must be nonblocking for this
function to be thread aware.
The following macro maps spt_fgetc(|) to fgetc(|) and has been defined in spthread.h:
#define fgetc(stream) spt_fgetc(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 fgetc(3) reference page. The following also applies:
• Value 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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