chmod man page on CentOS

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CHMOD(2)		   Linux Programmer's Manual		      CHMOD(2)

NAME
       chmod, fchmod - change permissions of a file

SYNOPSIS
       #include <sys/types.h>
       #include <sys/stat.h>

       int chmod(const char *path, mode_t mode);
       int fchmod(int fildes, mode_t mode);

DESCRIPTION
       The mode of the file given by path or referenced by fildes is changed.

       Modes are specified by or'ing the following:

	      S_ISUID	04000 set user ID on execution

	      S_ISGID	02000 set group ID on execution

	      S_ISVTX	01000 sticky bit

	      S_IRUSR	00400 read by owner

	      S_IWUSR	00200 write by owner

	      S_IXUSR	00100 execute/search by owner

	      S_IRGRP	00040 read by group

	      S_IWGRP	00020 write by group

	      S_IXGRP	00010 execute/search by group

	      S_IROTH	00004 read by others

	      S_IWOTH	00002 write by others

	      S_IXOTH	00001 execute/search by others

       The  effective  UID  of the calling process must match the owner of the
       file, or the process must  be  privileged  (Linux:  it  must  have  the
       CAP_FOWNER capability).

       If  the	calling	 process  is  not privileged (Linux: does not have the
       CAP_FSETID capability), and the group of the file does  not  match  the
       effective  group	 ID  of	 the process or one of its supplementary group
       IDs, the S_ISGID bit will be turned off, but this  will	not  cause  an
       error to be returned.

       As  a  security	measure, depending on the file system, the set-user-ID
       and set-group-ID execution bits may be turned off if a file is written.
       (On  Linux  this	 occurs	 if  the  writing  process  does  not have the
       CAP_FSETID capability.)	On some file systems, only the	superuser  can
       set  the	 sticky bit, which may have a special meaning.	For the sticky
       bit, and for set-user-ID and  set-group-ID  bits	 on  directories,  see
       stat(2).

       On  NFS	file  systems,	restricting  the  permissions will immediately
       influence already open files, because the access control is done on the
       server, but open files are maintained by the client.  Widening the per‐
       missions may be delayed for  other  clients  if	attribute  caching  is
       enabled on them.

RETURN VALUE
       On  success,  zero is returned.	On error, -1 is returned, and errno is
       set appropriately.

ERRORS
       Depending on the file system, other errors can be returned.   The  more
       general errors for chmod() are listed below:

       EACCES Search  permission  is denied on a component of the path prefix.
	      (See also path_resolution(2).)

       EFAULT path points outside your accessible address space.

       EIO    An I/O error occurred.

       ELOOP  Too many symbolic links were encountered in resolving path.

       ENAMETOOLONG
	      path is too long.

       ENOENT The file does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOTDIR
	      A component of the path prefix is not a directory.

       EPERM  The effective UID does not match the owner of the file, and  the
	      process	is  not	 privileged  (Linux:  it  does	not  have  the
	      CAP_FOWNER capability).

       EROFS  The named file resides on a read-only file system.

       The general errors for fchmod() are listed below:

       EBADF  The file descriptor fildes is not valid.

       EIO    See above.

       EPERM  See above.

       EROFS  See above.

CONFORMING TO
       4.4BSD, SVr4, POSIX.1-2001.

SEE ALSO
       chown(2), execve(2), fchmodat(2), open(2), path_resolution(2), stat(2)

Linux 2.6.7			  2004-06-23			      CHMOD(2)
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