Name
getusershell, setusershell, endusershell - get permitted user shellsLibrary
Standard C library ( libc ", " -lc )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/shellsAttributes
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
T} | Thread safety | MT-Unsafe |
Standards
None.History
4.3BSD.See Also
- shells(5)