Chmod

Change file permission bits

Declaration

Source position: oldlinux.pp line 1398

function Chmod(

path: PathStr;

Newmode: LongInt

):Boolean;

Description

Chmod Sets the Mode bits of the file in Path to NewMode. Newmode can be specified by 'or'-ing the following:

S_ISUID: Set user ID on execution.
S_ISGID: Set Group ID on execution.
S_ISVTX: Set sticky bit.
S_IRUSR: Read by owner.
S_IWUSR: Write by owner.
S_IXUSR: Execute by owner.
S_IRGRP: Read by group.
S_IWGRP: Write by group.
S_IXGRP: Execute by group.
S_IROTH: Read by others.
S_IWOTH: Write by others.
S_IXOTH: Execute by others.
S_IRWXO: Read, write, execute by others.
S_IRWXG: Read, write, execute by groups.
S_IRWXU: Read, write, execute by user.

Errors

Errors are returned in LinuxError.

sys_eperm: The effective UID doesn't match the ownership of the file, and is not zero. Owner or group were not specified correctly.
sys_eaccess: One of the directories in Path has no search (=execute) permission.
sys_enoent: A directory entry in Path does not exist or is a symbolic link pointing to a non-existent directory.
sys_enomem: Insufficient kernel memory.
sys_erofs: The file is on a read-only filesystem.
sys_eloop: Path has a reference to a circular symbolic link, i.e. a symbolic link, whose expansion points to itself.

Example

Program Example23;

{ Program to demonstrate the Chmod function. }

Uses oldlinux;

Var F : Text;

begin
  { Create a file }
  Assign (f,'testex21');
  Rewrite (F);
  Writeln (f,'#!/bin/sh');
  Writeln (f,'echo Some text for this file');
  Close (F);
  { Octal() makes the correct number from a
    number that LOOKS octal }
  Chmod ('testex21',octal (777));
  { File is now executable  }
  execl ('./testex21');
end.

Notes

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