{"id":7242,"date":"2022-12-20T19:35:58","date_gmt":"2022-12-20T22:35:58","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/getpass-man3\/"},"modified":"2022-12-20T19:35:58","modified_gmt":"2022-12-20T22:35:58","slug":"getpass-man3","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/getpass-man3\/","title":{"rendered":"GETPASS (man3)"},"content":{"rendered":"

GETPASS<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
RETURN VALUE<\/a>
ERRORS<\/a>
FILES<\/a>
ATTRIBUTES<\/a>
CONFORMING TO<\/a>
NOTES<\/a>
BUGS<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

getpass \u2212 get a password<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

#include <\/b><\/p>\n

char *getpass(const char *<\/b>prompt<\/i>);<\/b><\/p>\n

Feature Test Macro Requirements for glibc (see feature_test_macros<\/b>(7)):<\/p>\n

getpass<\/b>():<\/p>\n

Since glibc 2.2.2:<\/p>\n

_XOPEN_SOURCE && ! (_POSIX_C_SOURCE\u00a0>=\u00a0200112L)
|| \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Glibc since 2.19: bodies\/ usr\/ _DEFAULT_SOURCE
|| \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Glibc versions <= 2.19: bodies\/ usr\/ _BSD_SOURCE<\/p>\n

Before glibc 2.2.2:<\/p>\n

none<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

This function is obsolete. Do not use it. If you want to read input without terminal echoing enabled, see the description of the ECHO<\/i> flag in termios<\/b>(3).<\/p>\n

The getpass<\/b>() function opens \/dev\/tty<\/i> (the controlling terminal of the process), outputs the string prompt<\/i>, turns off echoing, reads one line (the “password”), restores the terminal state and closes \/dev\/tty<\/i> again.<\/p>\n

RETURN VALUE <\/a> <\/h2>\n

The function getpass<\/b>() returns a pointer to a static buffer containing (the first PASS_MAX<\/b> bytes of) the password without the trailing newline, terminated by a null byte (‘\u0000’). This buffer may be overwritten by a following call. On error, the terminal state is restored, errno<\/i> is set appropriately, and NULL is returned.<\/p>\n

ERRORS <\/a> <\/h2>\n

The function may fail if<\/p>\n\n\n
<\/td>\n\n

ENXIO<\/b><\/p>\n<\/td>\n

<\/td>\n\n

The process does not have a controlling terminal.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

FILES <\/a> <\/h2>\n

\/dev\/tty<\/i><\/p>\n

ATTRIBUTES <\/a> <\/h2>\n

For an explanation of the terms used in this section, see attributes<\/b>(7).<\/p>\n

\"Image<\/p>\n

CONFORMING TO <\/a> <\/h2>\n

Present in SUSv2, but marked LEGACY. Removed in POSIX.1-2001.<\/p>\n

NOTES <\/a> <\/h2>\n

In the GNU C library implementation, if \/dev\/tty<\/i> cannot be opened, the prompt is written to stderr<\/i> and the password is read from stdin<\/i>. There is no limit on the length of the password. Line editing is not disabled.<\/p>\n

According to SUSv2, the value of PASS_MAX<\/b> must be defined in <\/i> in case it is smaller than 8, and can in any case be obtained using sysconf(_SC_PASS_MAX)<\/i>. However, POSIX.2 withdraws the constants PASS_MAX<\/b> and _SC_PASS_MAX<\/b>, and the function getpass<\/b>(). The glibc version accepts _SC_PASS_MAX<\/b> and returns BUFSIZ<\/b> (e.g., 8192).<\/p>\n

BUGS <\/a> <\/h2>\n

The calling process should zero the password as soon as possible to avoid leaving the cleartext password visible in the process\u2019s address space.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

crypt<\/b>(3)<\/p>\n

COLOPHON <\/a> <\/h2>\n

This page is part of release 5.10 of the Linux man-pages<\/i> project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https:\/\/www.kernel.org\/doc\/man\u2212pages\/.<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

getpass \u2212 get a password <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2536],"tags":[2538,3568,3007],"class_list":["post-7242","post","type-post","status-publish","format-standard","hentry","category-3-llamadas-de-bibliotecas","tag-2538","tag-getpass","tag-man3"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/7242","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=7242"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/7242\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=7242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=7242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=7242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}