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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | FILES | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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GETUSERSHELL(3) Linux Programmer's Manual GETUSERSHELL(3)
getusershell, setusershell, endusershell - get permitted user
shells
#include <unistd.h>
char *getusershell(void);
void setusershell(void);
void endusershell(void);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
getusershell(), setusershell(), endusershell():
Since glibc 2.21:
_DEFAULT_SOURCE
In glibc 2.19 and 2.20:
_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Up to and including glibc 2.19:
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
The getusershell() function returns the next line from the file
/etc/shells, opening the file if necessary. The line should
contain the pathname of a valid user shell. If /etc/shells does
not exist or is unreadable, getusershell() behaves as if /bin/sh
and /bin/csh were listed in the file.
The setusershell() function rewinds /etc/shells.
The endusershell() function closes /etc/shells.
The getusershell() function returns NULL on end-of-file.
/etc/shells
For an explanation of the terms used in this section, see
attributes(7).
┌────────────────────────────────────┬───────────────┬───────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────┼───────────────┼───────────┤
│getusershell(), setusershell(), │ Thread safety │ MT-Unsafe │
│endusershell() │ │ │
└────────────────────────────────────┴───────────────┴───────────┘
4.3BSD.
shells(5)
This page is part of release 5.13 of the Linux man-pages 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-pages/.
GNU 2021-03-22 GETUSERSHELL(3)
Pages that refer to this page: shells(5)
Copyright and license for this manual page
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