glibc/login
Ulrich Drepper da2d1bc5ad Update.
1998-02-10 23:57  Ulrich Drepper  <drepper@happy.cygnus.com>

	* misc/tst-efgcvt.c: Add more tests.
	* misc/efgcvt_r.c: Correct result for above new tests.

1998-02-06 17:22  H.J. Lu  <hjl@gnu.org>

	* misc/efgcvt_r.c (fcvt_r, ecvt_r): Correctly handle
	NDIGIT <= 0.

1998-02-10 16:48  Philip Blundell  <pb@nexus.co.uk>

	* Makerules (install-no-libc.a-nosubdir): Don't install-bin (etc)
	if the programs weren't built.

1998-02-09 10:12  Philip Blundell  <pb@nexus.co.uk>

	* sysdeps/libm-ieee754/s_exp2.c (__ieee754_exp2): If we don't have
	FE_TONEAREST, soldier on regardless and do the best we can.
	* sysdeps/libm-ieee754/s_exp2f.c (__ieee754_exp2f): likewise.

1998-02-5 17:20  Philip Blundell  <pb@nexus.co.uk>

	* sysdeps/standalone/filedesc.h: Define __need_FOPEN_MAX, not
	_STDIO_H, before including <bits/stdio_lim.h>.

	* sysdeps/standalone/arm/bits/errno.h (EOVERFLOW): Added.

	* io/fts.c (fts_build): Don't try to use d_type if it doesn't
	exist.
	
	* sysdeps/arm/sys/ucontext.h: New file.

1998-02-04 10:11  Philip Blundell  <pb@nexus.co.uk>

	* manual/stdio.texi (Formatted Output Functions): Explicitly say
	that the return value from snprintf() does not count the
	terminating NUL as a character.
	
1998-02-10 16:57  Ulrich Drepper  <drepper@happy.cygnus.com>

	* manual/users.texi: Rewrite to describe correct POSIX behaviour,
	add description for sete[ug]id and general cleanup.
	Patch by Zack Weinberg <zack@rabi.phys.columbia.edu>.

1998-01-04  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile (parent-clean): Don't remove makefile fragments here.
	(postclean): New variable.
	(clean): Remove makefile fragments here.
	(realclean distclean): Likewise.  Pass sysdep-subdirs to sub-make.
	(generated): Add isomac and isomanc.out.
	* Makeconfig ($(common-objpfx)soversions.mk): Don't generate if
	avoid-generated is set.
	(postclean-generated): Add soversion.mk.
	($(common-objpfx)version.mk): Don't include if avoid-generated is
	set.
	* Makerules: Still need to include $(+sysdir_pfx)sysd-Makefile if
	avoid-generated is set.
	(common-generated): Add libc.so and libc.so$(libc.so-version).
	(generated): Add versioned libraries.
	(common-mostlyclean): Also remove %.so and %_pic.a.
	* csu/Makefile (generated): Add abi-tag.h.
	* db2/Makefile (extra-objs): Add getlong.o.
	* elf/Makefile (generated): Add ld.so, ldd and
	$(rtld-installed-name).
	(others): Add ldconfig here instead of ldconfig.o to extra-objs.
	* malloc/Makefile (generated): Add mtrace.
	* po/Makefile: Don't include version.mk, not needed any more.
	* sunrpc/Makefile (generated): Add rpc-proto.d and rpcgen.
	* sysdeps/unix/Makefile: Fix local_lim.h -> bits/local_lim.h,
	syscall.h -> sys/syscall.h.
	(common-generated): Add s-proto.d.
	(postclean-generated): Add sysd-syscalls.
	* localedata/Makefile (test-output): Add all output files.
	(generated): Add test-input and test-output.
	(generated-dirs): Add all the dirs.

1998-01-04  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile (test-output, generated, generated-dirs): New
	variables.

1998-02-10 16:57  Ulrich Drepper  <drepper@happy.cygnus.com>

	* resolv/nss_dns/dns-host.c: Various code cleanups.
	
1998-02-09 08:10  H.J. Lu  <hjl@gnu.org>

	* resolv/gethnamaddr.c (getanswer): Fix the PTR/CNAME bug.
	From Philip Blundell <pb@nexus.co.uk>.
	* resolv/nss_dns/dns-host.c (getanswer_r): Ditto.

1998-02-08  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* libc.map: Add .rem, .div, .mul, .udiv, .umul, .urem for Sparc.
	Suggested by debian/sparc porters.

1998-02-07  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* misc/tst-efgcvt.c: Totally rewritten, added a lot of new tests
	for ecvt and fcvt.

1998-02-10 16:32  Ulrich Drepper  <drepper@happy.cygnus.com>

	* sysdeps/unix/sysv/linux/ptsname.c (__ptsname_r): Use __xstat and
	__fxstat instead of stat and fstat.  Use namespace clean __stpcpy.

	* signal/signal.h: Always define sigset_t if __need_sigset_t is
	defined even if __USE_POSIX is not defined.

1998-02-02 20:51  Zack Weinberg  <zack@rabi.phys.columbia.edu>

	* sysdeps/unix/sysv/linux/ptsname.c (__ptsname_r): Correct last patch
	to support obsolete tty major numbers correctly.
	
1998-02-02 08:47  H.J. Lu  <hjl@gnu.org>

	* login/Makefile ($(inst_libexecdir)/pt_chown): Make the target
	directory first and ignore install error.

	* sysdeps/unix/sysv/linux/ptsname.c (__ptsname_r): Substract
	128 from ptyno and fix a typo for the BSD style pty.

1998-02-01  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/Makefile ($(common-objpfx)s-proto.d): Depend on all
	syscalls.list's.

1998-02-01  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Add
	getresuid and getresgid.

	* sysdeps/unix/sysv/linux/getresuid.c: New file.
	* sysdeps/unix/sysv/linux/getresgid.c: New file.

	* sysdeps/unix/sysv/linux/syscalls.list: Remove getres[ug]id, add
	s_getres[ug]id.

	* sysdeps/unix/sysv/linux/alpha/syscalls.list: Add getres[ug]id.
	* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/syscalls.list: Likewise.

1998-02-02 08:11  H.J. Lu  <hjl@gnu.org>

	* nscd/grpcache.c: Include <stdlib.h>.

1998-02-01 16:01  H.J. Lu  <hjl@gnu.org>

	* stdlib/atoll.c: Fix comments.

	* sysdeps/posix/ttyname.c: Ignore stdin/stdout/stderr.
	* sysdeps/posix/ttyname_r.c: Ditto.

1998-02-03  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* io/sys/stat.h: Define S_IFLNK and S_IFSOCK if __USE_BSD or
	__USE_MISC, independent of __USE_UNIX98.

1998-02-10 19:18  Ulrich Drepper  <drepper@happy.cygnus.com>

	* sysdeps/unix/sysv/linux/i386/sigaction.c (__libc_missing_rt_sigs):
	Rename from __libc_have_rt_sigs and leave as COMMON data.
	
1998-02-04 11:58  Richard Henderson  <rth@twiddle.rth.home>

	* Makeconfig (CFLAGS-.os): Kill -fno-common.
	* Makerules (libc.so): Prelink libc_pic.a, allocating commons.

	* libc.map (GLIBC_2.1): Add Linux/Alpha tv64 symbols.
	* elf/rtld.map: New file.  Needed to define the GLIBC_2.* 
	version symbols.
	* include/libc-symbols.h (symbol_version, default_symbol_version):
	Provide asm versions and correct !DO_VERSIONING versions.
	* sysdeps/unix/make-syscalls.sh: Recognize version symbols in
	the weak symbol list.
	
	* sysdeps/unix/sysv/linux/sigaction.c (__libc_missing_rt_sigs):
	Rename from __libc_have_rt_sigs and leave as COMMON data.
	* sysdeps/unix/sysv/linux/sigpending.c: Likewise.
	* sysdeps/unix/sysv/linux/sigprocmask.c: Likewise.
	* sysdeps/unix/sysv/linux/sigsuspend.c: Likewise.

1998-02-04 16:41  Zack Weinberg  <zack@rabi.phys.columbia.edu>

	* sunrpc/Makefile: Correct dependencies of rpcgen.

1998-02-10 03:00  Ulrich Drepper  <drepper@happy.cygnus.com>

	* nscd/Makefile: Fix test for available linuxthreads add-on.
	Patch by Zack Weinberg <zack@rabi.phys.columbia.edu>.

1998-02-05  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/unix/sysv/linux/syscalls.list: Fix typo in lchown.

1998-02-03  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/gnu/Makefile: Respect with-cvs variable.

	* manual/errno.texi (Error Messages): Correct description of
	strerror_r.  Pointed out by jonas@bagge.se.

1998-01-29  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* manual/socket.texi (Host Address Functions): Clarify description 
	of inet_network.

1998-02-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/grantpt.c (argv): Move const to toplevel.
	(grantpt): Delete superfluous cast.

1998-02-06  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile ($(inst_slibdir)/libc-$(version).so): Depend on
	elf/ldso_install instead of elf/subdir_install.
	(elf/ldso_install): New target.

	* elf/Makefile (ldso_install): New target.

1998-02-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/powerpc/socket.S: Really do the change
	of 1998-01-06.

1998-02-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* string/bits/string2.h (strcmp): Use __string2_1bptr_p only for
	constant expressions.

1998-02-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* nss/test-netdb.c: Include <unistd.h> for gethostname and "nss.h"
	for __nss_configure_lookup.
	(output_hostent): Remove unused variable.

1998-02-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* string/tst-inlcall.c: Fix format string.

1998-02-09  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* inet/netinet/in.h: Rename second parameter of bindresvport to
	avoid buggy gcc warning. [PR libc/412]
1998-02-10 20:06:30 +00:00
..
programs Update. 1998-01-30 11:44:34 +00:00
forkpty.c Update. 1998-01-30 11:44:34 +00:00
getutent_r.c Update. 1997-08-10 18:37:15 +00:00
getutent.c Update. 1997-07-12 23:35:19 +00:00
getutid_r.c Update. 1997-08-10 18:37:15 +00:00
getutid.c Update. 1997-08-14 01:54:13 +00:00
getutline_r.c Update. 1997-08-10 18:37:15 +00:00
getutline.c Update. 1997-08-10 18:37:15 +00:00
lastlog.h Update. 1997-06-21 02:59:26 +00:00
libutil.map Update. 1997-06-13 22:46:42 +00:00
login_tty.c update from main archive 961001 1996-10-02 01:40:17 +00:00
login.c Update. 1997-08-14 01:54:13 +00:00
logout.c Update. 1997-08-10 18:37:15 +00:00
logwtmp.c Update. 1997-05-29 12:06:58 +00:00
Makefile Update. 1998-02-10 20:06:30 +00:00
openpty.c Update. 1998-01-30 11:44:34 +00:00
pty-internal.h Update. 1998-01-30 11:44:34 +00:00
pty.h Update. 1997-11-26 04:23:08 +00:00
README.utmpd Update. 1997-10-26 20:13:00 +00:00
updwtmp.c Update. 1997-05-29 12:06:58 +00:00
utmp_daemon.c Update. 1997-11-06 00:02:46 +00:00
utmp_file.c Update. 1998-01-30 11:44:34 +00:00
utmp-private.h Update. 1997-08-02 21:00:51 +00:00
utmp.h Update. 1997-06-21 02:59:26 +00:00
utmpname.c Update. 1997-08-10 18:37:15 +00:00
utmpx.h Update. 1997-07-12 23:35:19 +00:00

With the introduction of version 2 of the GNU C Library the format of
the UTMP and WTMP files changed for some configurations (see Q&A 10 of
the FAQ).  This version of the GNU C Library contains a solution for
the problems this may cause, by providing an UTMP daemon `utmpd'.

Do I need it?
=============

If your configuration is one of the following:

                i[3456]86-*-linux-gnu    Linux-2.0 on Intel
                m68k-*-linux-gnu         Linux-2.0 on Motorola 680x0

you might need it, so please read on.  If it is not, please read the
section titled `Programming' at the end of this text.

In principle, you only need the daemon if you want to keep using old
programs linked against the previous version of the Linux C Library
(libc5).  In addition you will need the daemon if you are running
Linux on Intel, and you are planning to use iBCS (Intel Binary
Compatibility Standard).  If you have no libc5 programs left on your
system and you are not using iBCS, it is probably better not to
install the daemon since it uses (a small amount of) memory and CPU
time.  But apart from that it shouldn't hurt to install `utmpd', so
when in doubt install it anyway.


Installation
============

The installation process (`make install') already places the `utmpd'
binary in $(sbindir).  The only thing you have to do is modifying your
startup scripts to start the daemon.  Unfortunately this is a bit of a
hassle, since the layout of these scripts is not standardized.  You
should try to find the command that creates the file `/var/run/utmp'.
This is usually done in a script named `/etc/rc', `/etc/init.d/boot'
(Debian) or `/etc/rc.d/rc.S' (Slackware).  You could try:

     grep utmp /etc/* /etc/init.d/* /etc/rc.d/*

to find the right script.  The creation of `/var/run/utmp' is usually
done with a command like:

     : > /var/run/utmp

or

     cat /dev/null > /var/run/utmp

Now add a line before this command to create the file `/var/run/utmpx'
e.g.

     : > /var/run/utmpx

or

     cat /dev/null > /var/run/utmpx

whatever you prefer, and after this command, add a line to start the
daemon

     utmpd

The entire fragment could look something like

     # Clean up /var/run and create /var/run/utmp so that we can login.
     ( cd /var/run && find . ! -type d -exec rm -f -- {} \; )
     : > /var/run/utmpx
     : > /var/run/utmp
     utmpd

If the file `/var/log/wtmp' exists on your system, you will probably
want to create the file `/var/log/wtmpx'.  Programs linked against the
GNU C Library will now write to `/var/log/wtmpx', while programs
linked against the old library will continue to write to
`/var/log/wtmp'.  Of course this means that the information gets
spread over two files.  We hope to provide a better solution in the
future.

After a reboot, user accounting should be working again.  If not,
please refer to the section titled `Troubleshooting' below before
submitting a bug report.


What is `utmpd' doing?
======================

After installation there will be two files that store the user
accounting information: `/var/run/utmp' and `/var/run/utmpx'.  The
file `/var/run/utmp' will be in the old format so libc5 programs will
continue to work (even if they are broken and do not use the library
functions to access the user accounting database).  And on Intel, you
can safely link `/var/run/utmp' to `/etc/utmp' for iBCS programs.
Programs linked against the new GNU C Library (glibc2) will contact
the daemon for all user accounting database access.  The daemon will
store its information in `/var/run/utmpx' and keeps this file in sync
with `/var/run/utmp'.  Entries added to `/var/run/utmpx' will be
converted to the old format and will be added to `/var/run/utmp' and
vice versa.  This way both libc5 and glibc2 see the same information
in the same fields of `struct utmp'. Of course libc5 programs see only
part of the information that glibc2 programs see because not all
members of the glibc2 `struct utmp' are present in the libc5 `struct
utmp'.  For the same reason libc5 will see a truncated version of
those fields where the length of the glibc2 field is larger than the
corresponding libc5 field (ut_user, ut_line, ut_host).


Troubleshooting
===============

If user accounting is not working on your system, e.g. programs like
`who' or `logname' return rubbish, or you cannot login, make
sure that:

*  The file `/var/run/utmpx' exists.

*  The file `/var/log/wtmpx' exists.

*  No program linked against the GNU C Library (libc6) is accessing
   `/var/run/utmp' directly (see the section on `Programming' below).

If that does not solve your problems, please use the `glibcbug' script
to report the problem to <bugs@gnu.org>.

The `utmpd' daemon uses `syslogd' to report problems.  It uses the
`daemon' facility and `warning' and `error' levels.  Alternatively you
could use the following option to ease debugging:

`--debug'
    Use this option if you want the daemon to output its warnings and
    error messages to the terminal instead of sending them to the
    system logger (`syslogd').  When using this option the daemon does
    not auto-background itself.

To use this option you should first kill the daemon that is already
running, and start a fresh one with the desired option:

    kill `cat /var/run/utmpd.pid`
    utmpd --debug

Please include any warnings or error messages from `utmpd' in your
bug reports.


Programming
===========

In order for the `utmpd' approach to work it is essential that NO
program EVER accesses the UTMP and WTMP files directly.  Instead, a
program should use ONLY the available library functions:

     * utmpname()	Select the database used (UTMP, WTMP, ...).
     * setutent()	Open the database.
     * getutent()	Read the next entry from the database.
     * getutid()	Search for the next entry with a specific ID.
     * getutline()	Search for the next entry for a specific line.
     * pututline()	Write an entry to the database.
     * endutent()	Close the database.
     * updwtmp()	Add an entry to a database (WTMP, ...).

For details, please refer to `The GNU C Library Reference Manual',
which also contains information about some additional functions
derived from BSD and XPG that may be of interest.  The command

    info libc "User Accounting Database"

should point you at the right location.

If you encounter a program that reads from or, even worse, writes to
the UTMP and WTMP files directly, please report this as a bug to the
author of that program.  Note that the files referred to by the macros
`_PATH_UTMP' and `_PATH_WTMP' might even disappear in the future, so
please do not use these, except in a call to `utmpname()' or
`updwtmp()', not even to check their existence.