Guardian Native C Library Calls Reference Manual (G06.28+, H06.04+)

Guardian Native C Library Calls (f) freopen_guardian(3)
freopen_oss() is functionally identical to the freopen() function of the OSS environment. It is
the same as setting systype oss at compile-time. systype oss is the default setting for c89
in the OSS environment and on UNIX workstations.
freopen_guardian() is functionally identical to the freopen() function of the Guardian environ-
ment. It is the same as setting systype guardian at compile-time. systype guardian is
the default setting for the C and C++ compilers in the Guardian environment.
To use the freopen_oss() or freopen_guardian() functions, specify the _TANDEM_SOURCE
feature test macro.
RETURN VALUES
If the freopen( ) function fails, a null pointer is returned, and errno is set to indicate the error.
ERRORS
If any of the following conditions occurs, the freopen( ) function sets errno to the value that
corresponds to the condition.
[EINVAL] The mode parameter is not a valid mode.
[EMFILE] The OPEN_MAX file descriptors are currently open in the calling process.
[ENFILE] Too many files are currently open in the processor.
[ENOENT] The named file does not exist or the filename parameter points to an empty
string.
[ENOMEM] Insufficient space to allocate a buffer.
For all other error conditions, errno is set to the appropriate Guardian file-system error number.
Refer to the Guardian Procedure Errors and Messages Manual for more information about a
specific Guardian file-system error.
RELATED INFORMATION
Functions: open(2), fclose(3), fopen(3), freopen(3), freopen_oss(3), fseek(3), setbuf(3).
STANDARDS CONFORMANCE
The freopen_guardian() function is an HP extension to the XPG4 Version 2 specification.
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