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

System Functions (n - p) open(2)
• 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], [ENOTSUP], [EOSSNOTRUNNING], and [EPERM] can be
returned.
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