getusershell - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEgetusershell, setusershell, endusershell − get permitted user shells

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LIBRARYStandard C library (libc, −lc)

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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)

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DESCRIPTIONThe 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.

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RETURN VALUEThe getusershell() function returns NULL on end-of-file.

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FILES/etc/shells

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue getusershell(), setusershell(), endusershell() Thread safetyMT-Unsafe

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STANDARDS4.3BSD.

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SEE ALSOshells(5) 0

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