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umask (2)
  • umask (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • umask (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • umask (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • umask (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • umask (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  • umask (2) ( Solaris man: Системные вызовы )
  • umask (2) ( FreeBSD man: Системные вызовы )
  • umask (2) ( Русские man: Системные вызовы )
  • >> umask (2) ( Linux man: Системные вызовы )
  • umask (3) ( POSIX man: Библиотечные вызовы )
  •  

    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)  

    COLOPHON

    This page is part of release 3.14 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/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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