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Library: omfsys - file system utilities Include: omfsys.xin

Declaration

  define external function FS_ChangePermissions
                  value      stream  path
     to           value      integer mode
     status       modifiable stream  statusvalue 

This function allows you to change the access permissions on a file or a directory.

Input arguments:

• "path" is the valid pathname of the file you want to change the permissions for. The user must either be the owner or have sufficient permissions on the path/files involved.
• "mode" is the new access permission mode for the file. It may be any combination of the following:
  • "04000" -- set user ID on execute
  • "020#0" -- set group ID on execute if "#" is 7, 5, 3, or 1; enable mandatory file/record locking if "#" is 6, 4, 2, or 0 (zero)
  • "01000" -- save text image after execution
  • "00700" -- give file owner read, write, and execute permissions
  • "00400" -- give file owner read permission
  • "00200" -- give file owner write permission
  • "00100" -- give file owner execute permission
  • "00070" -- give group read, write, and execute permissions
  • "00040" -- give group read permission
  • "00020" -- give group write permission
  • "00010" -- give group execute permission
  • "00007" -- give others read, write, and execute permissions
  • "00004" -- give others read permission
  • "00002" -- give others write permission
  • "00001" -- give others execute permission

Output arguments:

• "statusvalue". This will contain either a zero length string if the function succeeds, or one of the following error codes:
  • "EACCES" -- no search permission on a component of the pathname
  • "EINTR" -- a signal was caught while the function was searching
  • "EIO" -- a file system I/O error occurred
  • "ELOOP" -- (UNIX only) a symbolic link recursion was detected
  • "ENAMETOOLONG" -- the pathname exceeds the system limits
  • "ENOENT" -- the specified path does not exist
  • "ENOLINK" -- (UNIX only) a required link to a remote machine is inactive
  • "ENOTDIR" -- the pathname is not a valid directory
  • "EMULITHOP" -- (UNIX only) remote machine access is required, but not allowed
  • "EPERM" -- the user does not have the required permissions
  • "EROFS" -- the file resides on a read-only file system

The permissions granted by a call to FS_ChangePermissions cannot exceed those allowed by the operating system.