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GETPASS !!!GETPASS NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS NOTES FILES SEE ALSO HISTORY BUGS ---- !!NAME getpass - get a password !!SYNOPSIS __#include __ __char *getpass( const char * prompt );__ !!DESCRIPTION This function is obsolete. Do not use it. The __getpass__() function opens ''/dev/tty'' (the controlling terminal of the process), outputs the string ''prompt'', turns off echoing, reads one line (the ''/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 newline, terminated by a NUL. 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. !!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 127 bytes of the password are returned. While reading the password, signal generation (SIGINT, SIGQUIT, SIGSTOP, SIGTSTOP) is disabled and the corresponding characters (usually control-C, control-, control-Z and control-Y) are transmitted as part of the password. Since libc 5.4.19 also line editing is disabled, so that also backspace and the like will be seen as part of the password. For glibc2, if ''/dev/tty'' cannot be opened, the prompt is written to ''stderr'' and the password is read from ''stdin''. There is no limit on the length of the password. Line editing is not disabled. According to the SUSv2, the value of PASS_MAX must be defined in '''' in case it is smaller than 8, and can in any case be obtained using ''sysconf(_SC_PASS_MAX)''. However, POSIX.2 withdraws the constants 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). !!FILES ''/dev/tty'' !!SEE ALSO crypt(3) !!HISTORY A __getpass__ function appeared in Version 7 AT __ !!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. ----
4 pages link to
getpass(3)
:
Man3g
crypt(3)
login.defs(5)
mkpasswd(1)
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