LDP
/
man-pages
mirror of https://github.com/mkerrisk/man-pages
0
1
Fork 0
Code Releases Activity

Add discussion of POSIX.1 utmpx specification. 

Move some text from CONFORMING To to NOTES.
This commit is contained in:
Michael Kerrisk 2008-06-29 06:16:33 +00:00
parent 1c3f428027
commit 0ef1b0fc23
1 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
man5/utmp.5
View File

@ -219,6 +219,20 @@ removed, record-keeping is turned off.
.br .br
/var/log/wtmp /var/log/wtmp
.SH "CONFORMING TO" .SH "CONFORMING TO"
.PP
POSIX.1 does not specify a
.I utmp
structure, but rather one named
.IR utmpx ,
with specifications for the fields
.IR ut_type ,
.IR ut_pid ,
.IR ut_line ,
.IR ut_id ,
.IR ut_user ,
and
.IR ut_tv .
.SS Comparison with Historical Systems
Linux utmp entries conform neither to v7/BSD nor to System V; they are a Linux utmp entries conform neither to v7/BSD nor to System V; they are a
mix of the two. mix of the two.
v7/BSD has fewer fields; most importantly it lacks v7/BSD has fewer fields; most importantly it lacks
@ -244,6 +258,7 @@ such as \fB"new time"\fP in the line field.
\fBUT_UNKNOWN\fP seems \fBUT_UNKNOWN\fP seems
to be a Linux invention. to be a Linux invention.
System V has no \fIut_host\fP or \fIut_addr_v6\fP fields. System V has no \fIut_host\fP or \fIut_addr_v6\fP fields.
.SH NOTES
.PP .PP
Unlike various other Unlike various other
systems, where utmp logging can be disabled by removing the file, utmp systems, where utmp logging can be disabled by removing the file, utmp
@ -256,7 +271,7 @@ Note that the \fIutmp\fP struct from libc5 has changed in libc6.
Because of this, Because of this,
binaries using the old libc5 struct will corrupt binaries using the old libc5 struct will corrupt
.IR /var/run/utmp " and/or " /var/log/wtmp . .IR /var/run/utmp " and/or " /var/log/wtmp .
.SH NOTES .PP
The file format is machine-dependent, so it is recommended that it be The file format is machine-dependent, so it is recommended that it be
processed only on the machine architecture where it was created. processed only on the machine architecture where it was created.
.PP .PP