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

open64(2) OSS System Calls Reference Manual
STANDARDS CONFORMANCE
The POSIX standards leave some features to the implementing vendor to define. These features
are affected in the HP implementation:
• The O_RDWR flag is supported for FIFO files.
• The group ID of the new file is determined by the value of the O_ISGID flag in the
parent directory.
• The O_NONBLOCK flag is ignored for regular disk files and directory files.
• The O_NOCTTY flag is ignored for regular disk files and directory files.
• The O_CREAT flag is ignored for FIFOs and tty files.
• If the O_CREAT flag is specified and bits other than the file permission and appropriate
file type flags are set in the mode parameter, errno is set to [EINVAL].
• If the O_TRUNC flag is specified and the O_RDONLY access flag is specified, the open
fails.
• The O_TRUNC flag is ignored for files other than regular files.
• Attempting to open an OSS directory with an access flag of O_WRONLY or O_RDWR
fails.
• Specifying the O_NONBLOCK flag when opening character special devices that sup-
port nonblocking opens is supported.
HP extensions to the XPG4 Version 2 specification are:
• Opening Guardian files (that is, files in the /G file system) is supported, as described
under Opening Guardian Files in DESCRIPTION.
• Access control lists (ACLs) for OSS files are supported.
• The errno values [EFAULT], [EFILEBAD], [EFSBAD], [EGUARDIANOPEN], [EIO],
[ELOOP], [ENETDOWN], [EOSSNOTRUNNING], and [EPERM] can be returned.
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