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getusershell(3) [v7 man page]

GETUSERSHELL(3) 					     Linux Programmer's Manual						   GETUSERSHELL(3)

NAME
getusershell, setusershell, endusershell - get permitted user shells SYNOPSIS
#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) DESCRIPTION
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. RETURN VALUE
The getusershell() function returns NULL on end-of-file. FILES
/etc/shells ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +--------------------------------+---------------+-----------+ |Interface | Attribute | Value | +--------------------------------+---------------+-----------+ |getusershell(), setusershell(), | Thread safety | MT-Unsafe | |endusershell() | | | +--------------------------------+---------------+-----------+ CONFORMING TO
4.3BSD. SEE ALSO
shells(5) COLOPHON
This page is part of release 4.15 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
2016-03-15 GETUSERSHELL(3)

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GETUSERSHELL(3)                                              Linux Programmer's Manual                                             GETUSERSHELL(3)

NAME
getusershell, setusershell, endusershell - get permitted user shells SYNOPSIS
#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) DESCRIPTION
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. RETURN VALUE
The getusershell() function returns NULL on end-of-file. FILES
/etc/shells ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +--------------------------------+---------------+-----------+ |Interface | Attribute | Value | +--------------------------------+---------------+-----------+ |getusershell(), setusershell(), | Thread safety | MT-Unsafe | |endusershell() | | | +--------------------------------+---------------+-----------+ CONFORMING TO
4.3BSD. SEE ALSO
shells(5) COLOPHON
This page is part of release 4.15 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 2016-03-15 GETUSERSHELL(3)
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