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Man Pages


Manual Reference Pages  -  GETPASS (3)

NAME

getpass - get a password

CONTENTS

Library
Synopsis
Description
Return Values
Files
See Also
History
Bugs

LIBRARY


.Lb libc

SYNOPSIS


.In pwd.h
.In unistd.h char * getpass const char *prompt

DESCRIPTION

The getpass function displays a prompt to, and reads in a password from, /dev/tty. If this file is not accessible, getpass displays the prompt on the standard error output and reads from the standard input.

The password may be up to _PASSWORD_LEN (currently 128) characters in length. Any additional characters and the terminating newline character are discarded.

The getpass function turns off character echoing while reading the password.

RETURN VALUES

The getpass function returns a pointer to the null terminated password.

FILES

/dev/tty
 

SEE ALSO

crypt(3), readpassphrase(3)

HISTORY

A getpass function appeared in AT&T v7 .

BUGS

The getpass function leaves its result in an internal static object and returns a pointer to that object. Subsequent calls to getpass will modify the same object.

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

Upon receipt of a SIGTSTP, the input buffer will be flushed, so any partially typed password must be retyped when the process continues.

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