45 lines
986 B
Groff
45 lines
986 B
Groff
.\" @(#)getlogin.3 6.2 (Berkeley) 5/9/86
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.\"
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.TH GETLOGIN 3 "May 9, 1986"
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.AT 3
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.SH NAME
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getlogin \- get login name
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.SH SYNOPSIS
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.nf
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.ft B
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#include <unistd.h>
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char *getlogin(void)
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.fi
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.SH DESCRIPTION
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.B Getlogin
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returns a pointer to the login name as found in
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.BR /etc/utmp .
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It may be used in conjunction with
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.B getpwnam
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to locate the correct password file entry when the same user ID
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is shared by several login names.
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.PP
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If
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.B getlogin
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is called within a process that is not attached to a
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terminal, or if there is no entry in
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.B /etc/utmp
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for the process's terminal,
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.B getlogin
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returns a null pointer.
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A reasonable procedure for determining the login name is to first call
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.B getlogin
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and if it fails, to call
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.BR getpwuid ( getuid ()).
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.SH FILES
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/etc/utmp
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.SH "SEE ALSO"
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.BR getpwent (3),
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.BR utmp (5),
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.BR ttyslot (3)
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.SH DIAGNOSTICS
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Returns a null pointer if the name cannot be found.
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.SH BUGS
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The return values point to static data
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whose content is overwritten by each call.
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