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| 1 | .\" @(#)getlogin.3 6.2 (Berkeley) 5/9/86
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| 2 | .\"
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| 3 | .TH GETLOGIN 3 "May 9, 1986"
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| 4 | .AT 3
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| 5 | .SH NAME
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| 6 | getlogin \- get login name
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| 7 | .SH SYNOPSIS
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| 8 | .nf
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| 9 | .ft B
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| 10 | #include <unistd.h>
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| 11 |
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| 12 | char *getlogin(void)
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| 13 | .fi
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| 14 | .SH DESCRIPTION
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| 15 | .B Getlogin
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| 16 | returns a pointer to the login name as found in
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| 17 | .BR /etc/utmp .
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| 18 | It may be used in conjunction with
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| 19 | .B getpwnam
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| 20 | to locate the correct password file entry when the same user ID
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| 21 | is shared by several login names.
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| 22 | .PP
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| 23 | If
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| 24 | .B getlogin
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| 25 | is called within a process that is not attached to a
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| 26 | terminal, or if there is no entry in
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| 27 | .B /etc/utmp
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| 28 | for the process's terminal,
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| 29 | .B getlogin
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| 30 | returns a null pointer.
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| 31 | A reasonable procedure for determining the login name is to first call
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| 32 | .B getlogin
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| 33 | and if it fails, to call
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| 34 | .BR getpwuid ( getuid ()).
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| 35 | .SH FILES
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| 36 | /etc/utmp
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| 37 | .SH "SEE ALSO"
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| 38 | .BR getpwent (3),
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| 39 | .BR utmp (5),
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| 40 | .BR ttyslot (3)
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| 41 | .SH DIAGNOSTICS
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| 42 | Returns a null pointer if the name cannot be found.
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| 43 | .SH BUGS
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| 44 | The return values point to static data
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| 45 | whose content is overwritten by each call.
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