Open System Services System Calls Reference Manual (G06.28+, H06.05+)

System Functions (n - p) open64(2)
• The O_NONBLOCK flag is set, the named file is a FIFO file, the
O_WRONLY flag is set, and no process has the file open for reading.
• The fileset containing the client’s current working directory or root
directory is not mounted.
[EOPNOTSUPP]
The named file is a socket bound to the file system (not an AF_INET or
AF_INET6 socket) and cannot be opened.
[EOSSNOTRUNNING]
A required system process is not running.
[EPERM] One of these conditions exists:
• The function call attempted to create a file named lost+found in the root
directory of an OSS fileset.
• The call attempted to create a file in /E.
[EROFS] The named file resides on a read-only fileset, and write access is required.
[ETXTBSY] The file is being executed, and the oflag value is O_WRONLY or O_RDWR.
For all other error conditions, errno is set to the appropriate Guardian file-system error number.
For more information about a specific Guardian file-system error, see the Guardian Procedure
Errors and Messages Manual.
RELATED INFORMATION
Commands: getacl(1), setacl(1).|
Functions: acl(2), chmod(2), close(2), creat(2), creat64(2), fcntl(2), lseek(2), lseek64(2),
mknod(2), read(2), stat(2), stat64(2), umask(2), write(2).
Miscellaneous topics: acl(5).|
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.
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