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

mknod(2) OSS System Calls Reference Manual
S_ISGID Set the group ID of the file upon execution of the file
S_ISUID Set the user ID of the file upon execution of the file
S_ISVTX Restrict the deletion of files in a directory (ignored for other file
types)
S_IWGRP Write access by members of the group list
S_IWOTH Write access by others
S_IWUSR Write access by the owner of the file
S_IXGRP Execute (search) access by members of the group list
S_IXOTH Execute (search) access by others
S_IXUSR Execute (search) access by the owner of the file
device Specifies the type of device on which the file is created. This hexadecimal value
must be 0 (zero) unless the file type S_IFCHR is specified for the mode parame-
ter. When S_IFCHR is specified, the following values are valid:
0x0000000300000000
The device is an infinite data source or data sink, such as
/dev/null.
0x0000000200000000
The device is a controlling terminal, such as /dev/tty.
Specifying any other value for the device parameter when S_IFCHR is specified
for the mode parameter causes the function call to fail and errno to be set to
[EINVAL].
DESCRIPTION
The mknod( ) function creates a new special or regular file. Using the mknod() function to
create file types other than FIFOs requires appropriate privileges.
When the mknod() function creates a regular file in a fileset that supports access control lists
(ACLs), and the parent directory for that file has an ACL that contains default ACL entries, the
ACL for the file inherits the default ACL entries of the parent directory as actual (nondefault)
ACL entries for the new file. When the mknod( ) function creates a directory in a fileset that
supports ACLs, the ACL for the new directory inherits the default ACL entries of the parent
directory both as default and as actual (nondefault) ACL entries. For detailed information about
ACL inheritance, see the acl(5) reference page.
For the mknod( ) function to finish successfully, a process must have search permission and write
permission in the parent directory of the path parameter.
The new file has the following characteristics:
• A file type as specified by the mode parameter.
• An owner ID set to the effective user ID of the process.
• A group ID set to the effective group ID of the process or to the group ID of the parent
directory of the file.
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