The nscd parent process returns the result of a `wait' call rather
than the exit status of the child it waits for. These two aren't
exactly the same. In my case (and probably on most machines), the exit
status is in the 2nd LSB of the result of `wait', and so:
e.g. if the nscd child process returns 1, the parent returns 1 << 8,
which Bash happily reports as 0.
The attached patch removed the unused ‘thread_info_t’ typedef and the
‘thread_info’ variable from nscd.c. The former conflicts with a GNU Mach
typedef, and the latter conflicts with a GNU Mach function declaration:
<https://lists.gnu.org/archive/html/bug-hurd/2014-06/msg00101.html>.
Tested on x86_64-linux-gnu.
This patch makes files using __ASSUME_* macros include
<kernel-features.h> explicitly, rather than relying on some other
header (such as tls.h, lowlevellock.h or pthreadP.h) to include it
implicitly. (I omitted cases where I've already posted or am testing
the patch that stops the file from needing __ASSUME_* at all.) This
accords with the general principle of making source files include the
headers for anything they use, and also helps make it safe to remove
<kernel-features.h> includes from any file that doesn't use
__ASSUME_* (some of those may be stray includes left behind after
increasing the minimum kernel version, others may never have been
needed or may have become obsolete after some other change).
Tested x86_64 that the disassembly of installed shared libraries is
unchanged by this patch.
* nptl/pthread_cond_wait.c: Include <kernel-features.h>.
* nptl/pthread_rwlock_timedrdlock.c: Likewise.
* nptl/pthread_rwlock_timedwrlock.c: Likewise.
* nptl/sysdeps/unix/sysv/linux/lowlevelrobustlock.c: Likewise.
* nscd/nscd.c: Likewise.
* sysdeps/i386/nptl/tcb-offsets.sym: Likewise.
* sysdeps/powerpc/nptl/tcb-offsets.sym: Likewise.
* sysdeps/sh/nptl/tcb-offsets.sym: Likewise.
* sysdeps/x86_64/nptl/tcb-offsets.sym: Likewise.
Currently, the nscd parent process parses commandline options and
configuration, forks on startup and immediately exits with a success.
If the child process encounters some error after this, it goes
undetected and any services started up after it may have to repeatedly
check to make sure that the nscd service did actually start up and is
serving requests.
To make this process more reliable, I have added a pipe between the
parent and child process, through which the child process sends a
notification to the parent informing it of its status. The parent
waits for this status and once it receives it, exits with the
corresponding exit code. So if the child service sends a success
status (0), the parent exits with a success status. Similarly for
error conditions, the child sends the non-zero status code, which the
parent passes on as the exit code.
This, along with setting the nscd service type to forking in its
systemd configuration file, allows systemd to be certain that the nscd
service is ready and is accepting connections.
Usage output for option --invalidate=TABLE is not helpful without
list of tables. The list is also missing from nscd(8) manual which
made it pretty difficult to know what are the tables.
2012-05-09 Andreas Jaeger <aj@suse.de>
* nscd/nscd.c (run_modes): Make named enum, reorder so that
default is first entry.
(run_mode): Set type.
(main): Remove informal message about syslog.
(options): Fix typo.
For a better integration of nscd with systemd, we should run nscd not as
daemon but in the foreground. A new --foreground option should be added.
2012-05-09 Alexandre Oliva <aoliva@redhat.com>
Andreas Jaeger <aj@suse.de>
* nscd/nscd.c (go_background): Replaced with...
(run_mode): ... this.
(RUN_FOREGROUND, RUN_DAEMONIZE, RUN_DEBUG): Add.
(options): Add -F --foreground.
(main): Implement it.
(parse_opt): Parse it.
nscd can clear caches when certain files change. The list of files
was hardcoded so far and worked for nss_files and nss_dns and those
modules which need no monitoring. nss_db, for instance, has its
own set of files to monitor. Now the NSS modules themselves can
request that certain files are monitored.
Because we are not shutting down the other threads first another
thread might work on a query before the process shuts down. In this
case the now uninitialized libselinux and libaudit might be used.
Just don't free the resources. It's not necessary anyway because
the process is about to terminate.
* elf/ldd.bash.in: Likewise.
* elf/sprof.c: Likewise.
* locale/programs/locale.c: Likewise.
* malloc/memusage.sh: Likewise.
* nss/getent.c: Likewise.
2009-02-06 Joseph Myers <joseph@codesourcery.com>
* debug/pcprofiledump.c (print_version,
argp_program_version_hook): New function.
* elf/ldconfig.c (more_help): New function.
(argp): Use it.
* elf/sln.c (usage): New function.
(main): Support --help and --version.
* malloc/memusagestat.c (print_version): New function.
(argp_program_version_hook): New variable.
* nscd/nscd.c (more_help): New function.
(argp): Use it.
* posix/getconf.c (main): Send --version output to stdout.
Support --help.
* sunrpc/rpc_main.c (usage, options_usage): Take STREAM and STATUS
arguments. All callers changed.
(print_version): New function.
(parseargs): Support --help and --version.
* sunrpc/rpcinfo.c (usage): Take STREAM argument. All callers
changed.
(print_version): New function.
(main): Use getopt_long. Support --help and --version.
* sysdeps/unix/sysv/linux/lddlibc4.c (main): Support --help and
--version.
2009-02-06 Ulrich Drepper <drepper@redhat.com>
2006-10-06 Ulrich Drepper <drepper@redhat.com>
* po/pl.po: Update from translation team.
* nscd/nscd.c (main): Fix typo in message.
Patch by Jakub Bogsz <qboosh@pld-linux.org>.
* nscd/nscd.c (parse_opt): Read response from INVALIDATE request
to make sure the database has been already invalidated.
* nscd/cache.c (prune_cache): Add fd argument. Write response to fd
after the cache has been invalidated. Use pthread_mutex_lock rather
than pthread_mutex_trylock if fd != -1.
* nscd/connections.c (invalidate_cache): Add fd argument, write
response to fd if not calling prune_cache, pass fd to prune_cache.
(handle_request): Adjust invalidate_cache caller.
(nscd_run): Pass -1 as fd to prune_cache.
invalid length [Coverity CID 106].
* nss/nss_files/files-key.c (search): Close stream before
successful return [Coverity CID 107].
* io/fts.c (fts_open): Don't allocate parent if *argv==NULL
[Coverity CID 108].
* sunrpc/rpc_cout.c (inline_struct): Free sizestr after use
[Coverity CID 110, 109].
* sunrpc/rpc_scan.c (docppline): Free file string if it is not
going to be used [Coverity CID 111].
* sysdeps/unix/sysv/linux/getsourcefilter.c (getsourcefilter): Free
memory if socket level value cannot be retrieved [Coverity CID 112].
* nis/nis_clone_dir.c (nis_clone_directory): Free all memory in
error case [Coverity CID 114].
* nis/nis_clone_res.c (nis_clone_result): Free all memory in the
error cases [Coverity CID 115].
* sunrpc/rpc_parse.c (get_definition): Free defp if tok ==
TOK_EOF [Coverity CID 116].
* sysdeps/unix/sysv/linux/setsourcefilter.c (setsourcefilter): Free
memory if socket level value cannot be retrieved [Coverity CID 117].
* elf/cache.c (save_cache): Initialize pad to avoid writing
uninitialized data to disk.
* elf/cache.c (save_cache): Free file_entries_new [Coverity CID 118].
* intl/finddomain.c (_nl_find_domain): Avoid strdup of expand
locale name, use strdupa. Remove free call [Coverity CID 119].
* sunrpc/rpc_main.c (generate_guard): Avoid extra allocation and
the resulting leak [Coverity CID 121].
* sunrpc/rpc_main.c (mkfile_output): Free all allocated memory
[Coverity CID 122].
* sunrpc/rpc_main.c (h_output): Free guard after we are done
[Coverity CID 123].
* sunrpc/svc_udp.c (cache_set): Free victim if newbuf allocation
fails [Coverity CID 126].
* sunrpc/svc_udp.c (svcudp_enablecache): Free memory in error
cases [Coverity CID 127].
* nis/nis_table.c (__create_ib_request): Free ibreq in case strdup
fails [Coverity CID 128].
* nis/nis_getservlist.c (nis_getservlist): Free all memory in case
of an error [Coverity CID 130, 129].
* nis/nis_print_group_entry.c (nis_print_group_entry): If
nis_lookup call failed, return. Free lookup result in error
cases [Coverity CID 131].
* nis/nis_removemember.c (nis_removemember): Free all memory in
error cases [Coverity CID 132].
* nis/nss_nisplus/nisplus-alias.c (_nss_nisplus_getaliasbyname_r):
Always free lookup result [Coverity CID 134].
* nis/nss_nisplus/nisplus-ethers.c (_nss_nisplus_gethostton_r):
Always free lookup result [Coverity CID 135].
* nis/nss_nisplus/nisplus-ethers.c (_nss_nisplus_getntohost_r):
Always free lookup result [Coverity CID 136].
* nis/nss_nisplus/nisplus-network.c (_nss_nisplus_getnetbyaddr_r):
Before retrying, free old result [Coverity CID 137].
* nis/nss_nisplus/nisplus-publickey.c (_nss_nisplus_netname2user):
Free res in case UID is zero [Coverity CID 138].
* nis/ypclnt.c (yp_update): Always free master string
[Coverity CID 140].
* nis/nis_creategroup.c (nis_creategroup): Free all memory in
error cases [Coverity CID 143, 142, 141].
* nis/nss_nis/nis-publickey.c (_nss_nis_getpublickey): Free result
if yp_match call succeeded [Coverity CID 155].
* nis/nss_nis/nis-publickey.c (_nss_nis_getsecretkey): Free string
allocated in yp_match at all times [Coverity CID 157, 156].
* nscd/nscd.c (write_pid): Close stream also if writing failed
[Coverity CID 165].
* nis/nis_table.c (nis_add_entry): Move test for NULL parameter
ahead of first use [Coverity CID 167].
* nis/nss_nis/nis-alias.c (_nss_nis_getaliasbyname_r): Move test
for NULL parameter ahead of first use [Coverity CID 168].
* intl/finddomain.c (_nl_find_domain): We never return NULL if we
found the locale [Coverity CID 169].
* inet/getnameinfo.c (getnameinfo): __getservbyport_r does not set
herrno [Coverity CID 178].
* nis/nis_checkpoint.c (nis_checkpoint): Don't access and returned
freed object [Coverity CID 182].
(dbs): Initialize max_db_size fields.
(nscd_init): When mapping the database, use max_db_size as the
mapping size even if it is bigger than the file size.
* nscd/mem.c (mempool_alloc): When resizing the file make sure the
limit in max_db_size is not exceeded. Don't use mremap, just
posix_fallocate is enough (according to Linus). Use posix_fallocate
correctly.
* nscd/nscd.conf: Add max-db-size parameters.
* nscd/nscd.h (struct database_dyn): Add max_db_size field.
Define DEFAULT_MAX_DB_SIZE and DEFAULT_DATASIZE_PER_BUCKET.
Temporarily define TEMP_FAILURE_RETRY_VAL here.
* nscd/nscd_conf.c (nscd_parse_file): Parse max-db-size parameter
and add sanity checks for it.
* nscd/aicache.c (addhstaiX): Use send with MSG_NOSIGNAL not write to
send reply.
* nscd/connection.c (writeall): Likewise.
(handle_request): Likewise.
* nscd/grpcache.c (cache_addgr): Likewise.
* nscd/hstcache.c (cache_addhst): Likewise.
* nscd/initgrcache.c (addinitgroupsX): Likewise.
* nscd/nscd.c (parse_opt): Likewise.
* nscd/nscd_stat.c (send_stats): Likewise.
(receive_print_stats): Likewise.
* nscd/pwdcache.c (cache_addpw): Likewise.
* nscd/nscd.c (termination_handler): Avoid segfault if some database
is not enabled.
* nscd/nscd_getai.c (__nscd_getai): If ai_resp->found == -1, set
__nss_not_use_nscd_hosts and return -1.
* nscd/nscd_initgroups.c (__nscd_getgrouplist): If
initgr_resp->found == -1, set __nss_not_use_nscd_group and return -1.
Avoid leaking sockets.
2005-01-28 Andreas Schwab <schwab@suse.de>
H.J. Lu <hongjiu.lu@intel.com>
[BZ #677]
* elf/dl-runtime.c (fixup): Change return type to
DL_FIXUP_VALUE_TYPE. Use DL_FIXUP_VALUE_TYPE,
DL_FIXUP_MAKE_VALUE and DL_FIXUP_VALUE_CODE_ADDR for relocation
values. Use DL_FIXUP_VALUE_ADDR and DL_FIXUP_ADDR_VALUE to
store and retrieve relocation values.
(profile_fixup): Likewise.
* include/link.h (link_map): Use DL_FIXUP_VALUE_TYPE for
l_reloc_result.
* sysdeps/generic/dl-fptr.h (link_map): Forward declaration.
* sysdeps/generic/dl-lookupcfg.h (DL_FIXUP_VALUE_TYPE): New.
(DL_FIXUP_MAKE_VALUE): Likewise.
(DL_FIXUP_VALUE_CODE_ADDR): Likewise.
(DL_FIXUP_VALUE_ADDR): Likewise.
(DL_FIXUP_ADDR_VALUE): Likewise.
* sysdeps/ia64/dl-lookupcfg.h: Include <dl-fptr.h> for "struct fdesc".
(DL_FIXUP_VALUE_TYPE): New.
(DL_FIXUP_MAKE_VALUE): Likewise.
(DL_FIXUP_VALUE_CODE_ADDR): Likewise.
(DL_FIXUP_VALUE_ADDR): Likewise.
(DL_FIXUP_ADDR_VALUE): Likewise.
* sysdeps/ia64/dl-machine.h (elf_machine_profile_fixup_plt): Removed.
(elf_machine_profile_plt): Removed.
(elf_machine_fixup_plt): Change return type and type of value
parameter to struct fdesc.
(elf_machine_plt_value): Likewise.
(elf_machine_rela): Use DL_FIXUP_MAKE_VALUE to construct
argument for elf_machine_fixup_plt.
2005-02-07 Jakub Jelinek <jakub@redhat.com>
