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    Command:

    getpass

    
    
    

    SYNOPSIS

           #include <unistd.h>
    
           char *getpass( const char *prompt);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           getpass():
               Since glibc 2.2.2:
                   _BSD_SOURCE ||
                       (_XOPEN_SOURCE >= 500 ||
                           _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) &&
                       !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
               Before glibc 2.2.2:
                   none
    
    
    

    DESCRIPTION

           This  function  is obsolete.  Do not use it.  If you want to read input
           without terminal echoing enabled, see the description of the ECHO  flag
           in termios(3).
    
           The  getpass() function opens /dev/tty (the controlling terminal of the
           process), outputs the string prompt, turns off echoing, reads one  line
           (the  "password"),  restores  the  terminal  state  and closes /dev/tty
           again.
    
    
    

    RETURN VALUE

           The function getpass() returns a pointer to a static buffer  containing
           (the  first  PASS_MAX  bytes of) the password without the trailing new-
           line, terminated by a null byte ('\0').  This buffer may be overwritten
           by  a  following call.  On error, the terminal state is restored, errno
           is set appropriately, and NULL is returned.
    
    
    

    ERRORS

           The function may fail if
    
           ENXIO  The process does not have a controlling terminal.
    
    
    

    FILES

           /dev/tty
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The getpass() function is not thread-safe.
    
    
    

    CONFORMING TO

           Present in SUSv2, but marked LEGACY.  Removed in POSIX.1-2001.
    
    
    

    NOTES

           For libc4 and libc5, the prompt is  not  written  to  /dev/tty  but  to
           stderr.   Moreover,  if /dev/tty cannot be opened, the password is read
           from stdin.  The static buffer has length 128 so that  only  the  first
           PASS_MAX and _SC_PASS_MAX, and the function getpass().  Libc4 and libc5
           have  never  supported  PASS_MAX  or  _SC_PASS_MAX.    Glibc2   accepts
           _SC_PASS_MAX and returns BUFSIZ (e.g., 8192).
    
    
    

    BUGS

           The  calling  process  should  zero the password as soon as possible to
           avoid leaving the cleartext password visible in the  process's  address
           space.
    
    
    

    SEE ALSO

           crypt(3)
    
    
    

    Linux 2013-06-21 GETPASS(3)

    
    
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