10564b1175
groff 1.23.0 added .MR to its -man macro package. The NEWS file states
that the inclusion of the macro "was prompted by its introduction to
Plan 9 from User Space's troff in August 2020." From d32deab it seems
that the name for Plan 9 from User Space's implementation was suggested
by groff maintainer G. Brandon Robinson.
Not sure if the intention was to make these definitions compatible, but
it would be nice if they were.
Currently, Plan 9 from User Space's .MR expects its second argument to
be parenthesized. groff's .MR does not. This results in extra
parentheses appearing in manual references when viewing Plan 9 from User
Space's manual pages on a system using groff.
53 lines
949 B
Groff
53 lines
949 B
Groff
.TH GETUSER 3
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.SH NAME
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getuser, sysname \- get user or system name
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.SH SYNOPSIS
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.B #include <u.h>
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.br
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.B #include <libc.h>
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.PP
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.B
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char* getuser(void)
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.PP
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.B
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char* sysname(void)
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.SH DESCRIPTION
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.I Getuser
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returns a pointer to static data which contains the
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null-terminated
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name of the user who
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owns the current process.
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.I Getuser
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calls
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.MR getuid 2
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and then reads
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.B /etc/passwd
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to find the corresponding name.
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.PP
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.I Sysname
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returns a pointer to static data which contains the name
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of the machine on which the current process is running.
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.I Sysname
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looks first for an environment variable
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.BR $sysname .
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If there is no such variable,
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.I sysname
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calls
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.MR gethostname 2
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and truncates the returned name at the first dot.
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If
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.I gethostname
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fails,
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.I sysname
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returns the default name
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.LR gnot .
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.PP
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Unlike
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.IR getuser ,
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.I sysname
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caches the string, deriving the host name only once.
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.SH SOURCE
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.B \*9/src/lib9/getuser.c
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.br
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.B \*9/src/lib9/sysname.c
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