1GETUSERSHELL(3) Linux Programmer's Manual GETUSERSHELL(3)
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6 getusershell, setusershell, endusershell - get permitted user shells
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9 #include <unistd.h>
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11 char *getusershell(void);
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13 void setusershell(void);
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15 void endusershell(void);
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17 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19 getusershell(), setusershell(), endusershell():
20 Since glibc 2.21:
21 _DEFAULT_SOURCE
22 In glibc 2.19 and 2.20:
23 _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
24 Up to and including glibc 2.19:
25 _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
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28 The getusershell() function returns the next line from the file
29 /etc/shells, opening the file if necessary. The line should contain
30 the pathname of a valid user shell. If /etc/shells does not exist or
31 is unreadable, getusershell() behaves as if /bin/sh and /bin/csh were
32 listed in the file.
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34 The setusershell() function rewinds /etc/shells.
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36 The endusershell() function closes /etc/shells.
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39 The getusershell() function returns NULL on end-of-file.
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42 /etc/shells
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45 For an explanation of the terms used in this section, see
46 attributes(7).
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48 ┌────────────────────────────────┬───────────────┬───────────┐
49 │Interface │ Attribute │ Value │
50 ├────────────────────────────────┼───────────────┼───────────┤
51 │getusershell(), setusershell(), │ Thread safety │ MT-Unsafe │
52 │endusershell() │ │ │
53 └────────────────────────────────┴───────────────┴───────────┘
55 4.3BSD.
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58 shells(5)
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61 This page is part of release 5.04 of the Linux man-pages project. A
62 description of the project, information about reporting bugs, and the
63 latest version of this page, can be found at
64 https://www.kernel.org/doc/man-pages/.
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68GNU 2016-03-15 GETUSERSHELL(3)