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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():

_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

Multithreading (see pthreads(7) )

The getusershell(), setusershell() and endusershell() functions are not thread-safe.

Conforming to

4.3BSD.

See Also

shells(5)

Colophon

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