umask man page on Hurd

Man page or keyword search:  
man Server   6387 pages
apropos Keyword Search (all sections)
Output format
Hurd logo
[printable version]

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

NAME
       umask - set file mode creation mask

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

       mode_t umask(mode_t mask);

DESCRIPTION
       umask()	sets  the calling process's file mode creation mask (umask) to
       mask & 0777 (i.e., only the file permission bits of mask are used), and
       returns the previous value of the mask.

       The  umask  is  used  by open(2), mkdir(2), and other system calls that
       create files to modify the permissions placed on newly created files or
       directories.   Specifically,  permissions  in  the umask are turned off
       from the mode argument to open(2) and mkdir(2).

       The constants that should be used to specify mask are  described	 under
       stat(2).

       The  typical  default  value for the process umask is S_IWGRP | S_IWOTH
       (octal 022).  In the usual case where the mode argument to  open(2)  is
       specified as:

	   S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH

       (octal 0666) when creating a new file, the permissions on the resulting
       file will be:

	   S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH

       (because 0666 & ~022 = 0644; i.e., rw-r--r--).

RETURN VALUE
       This system call always succeeds and the previous value of the mask  is
       returned.

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.

NOTES
       A  child	 process created via fork(2) inherits its parent's umask.  The
       umask is left unchanged by execve(2).

       The umask setting also affects the permissions assigned	to  POSIX  IPC
       objects	(mq_open(3), sem_open(3), shm_open(3)), FIFOs (mkfifo(3)), and
       UNIX domain sockets (unix(7)) created by the process.  The  umask  does
       not  affect the permissions assigned to System V IPC objects created by
       the process (using msgget(2), semget(2), shmget(2)).

SEE ALSO
       chmod(2), mkdir(2), open(2), stat(2), acl(5)

COLOPHON
       This page is part of release 3.55 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2008-01-09			      UMASK(2)
[top]

List of man pages available for Hurd

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net