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Old 03-25-2021, 02:53 AM   #1
linuly
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ldd

hi,
Code:
ldd /usr/sbin/named
        linux-vdso.so.1 =>  (0x00007fff79692000)
        liblwres.so.160 => /lib64/liblwres.so.160 (0x00007f644f481000)
        libdns.so.1102 => /lib64/libdns.so.1102 (0x00007f644f049000)
        libbind9.so.160 => /lib64/libbind9.so.160 (0x00007f644ee39000)
        libisccfg.so.160 => /lib64/libisccfg.so.160 (0x00007f644ec0b000)
        libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f644e9be000)
        libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f644e6d5000)
        libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f644e4a2000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f644e29e000)
        libisccc.so.160 => /lib64/libisccc.so.160 (0x00007f644e093000)
        libisc.so.169 => /lib64/libisc.so.169 (0x00007f644de16000)
        libcrypto.so.10 => /lib64/libcrypto.so.10 (0x00007f644d9b3000)
        libcap.so.2 => /lib64/libcap.so.2 (0x00007f644d7ae000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f644d592000)
        libGeoIP.so.1 => /lib64/libGeoIP.so.1 (0x00007f644d362000)
        libxml2.so.2 => /lib64/libxml2.so.2 (0x00007f644cff8000)
        libz.so.1 => /lib64/libz.so.1 (0x00007f644cde2000)
        libm.so.6 => /lib64/libm.so.6 (0x00007f644cae0000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007f644c8dc000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f644c50e000)
        libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f644c2fe000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f644c0fa000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f644bee0000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f644f959000)
        libattr.so.1 => /lib64/libattr.so.1 (0x00007f644bcdb000)
        liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f644bab5000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f644b88e000)
        libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f644b62c000)
and
 lsof -p 1439|grep .so
named   1439 named  mem       REG              253,0    37168     6792 /usr/lib64/libnss_sss.so.2
named   1439 named  mem       REG              253,0    61560    41770 /usr/lib64/libnss_files-2.17.so
named   1439 named  mem       REG              253,0   402384    42119 /usr/lib64/libpcre.so.1.2.0
named   1439 named  mem       REG              253,0   155744    42128 /usr/lib64/libselinux.so.1
named   1439 named  mem       REG              253,0   157424    42139 /usr/lib64/liblzma.so.5.2.2
named   1439 named  mem       REG              253,0    19896    85820 /usr/lib64/libattr.so.1.1.0
named   1439 named  mem       REG              253,0   109976   386239 /usr/lib64/libresolv-2.17.so
named   1439 named  mem       REG              253,0    15688    91050 /usr/lib64/libkeyutils.so.1.5
named   1439 named  mem       REG              253,0    67104   263574 /usr/lib64/libkrb5support.so.0.1
named   1439 named  mem       REG              253,0  2156344    41745 /usr/lib64/libc-2.17.so
named   1439 named  mem       REG              253,0    19248    41752 /usr/lib64/libdl-2.17.so
named   1439 named  mem       REG              253,0  1136944    41755 /usr/lib64/libm-2.17.so
named   1439 named  mem       REG              253,0    90248    42131 /usr/lib64/libz.so.1.2.7
named   1439 named  mem       REG              253,0  1509528    85787 /usr/lib64/libxml2.so.2.9.1
named   1439 named  mem       REG              253,0   197088     6840 /usr/lib64/libGeoIP.so.1.5.0
named   1439 named  mem       REG              253,0   142144   386089 /usr/lib64/libpthread-2.17.so
named   1439 named  mem       REG              253,0    20048    85824 /usr/lib64/libcap.so.2.22
named   1439 named  mem       REG              253,0  2520768     6030 /usr/lib64/libcrypto.so.1.0.2k
named   1439 named  mem       REG              253,0   517360     6846 /usr/lib64/libisc.so.169.0.3
named   1439 named  mem       REG              253,0    45544     6852 /usr/lib64/libisccc.so.160.0.3
named   1439 named  mem       REG              253,0    15856    42141 /usr/lib64/libcom_err.so.2.1
named   1439 named  mem       REG              253,0   210784   263566 /usr/lib64/libk5crypto.so.3.1
named   1439 named  mem       REG              253,0   967840   263572 /usr/lib64/libkrb5.so.3.3
named   1439 named  mem       REG              253,0   320720   263562 /usr/lib64/libgssapi_krb5.so.2.2
named   1439 named  mem       REG              253,0   187264     6848 /usr/lib64/libisccfg.so.160.2.1
named   1439 named  mem       REG              253,0    65408     6850 /usr/lib64/libbind9.so.160.0.8
named   1439 named  mem       REG              253,0  2345592     6842 /usr/lib64/libdns.so.1102.1.2
named   1439 named  mem       REG              253,0    78272     6854 /usr/lib64/liblwres.so.160.0.2
named   1439 named  mem       REG              253,0   163312   386276 /usr/lib64/ld-2.17.so
where
ps -ef|grep named
named 1439 1 0 03:26 ? 00:00:01 /usr/sbin/named -u named -c /etc/named.conf

i expected that all the so libraries showed on ldd command to be opened when named run.but i see from lsof that only a part of them.
why this?

Code:
 ls -l /proc/1439/fd
total 0
lrwx------. 1 named named 64 Mar 25 03:40 0 -> /dev/null
lrwx------. 1 named named 64 Mar 25 03:40 1 -> /dev/null
lrwx------. 1 named named 64 Mar 25 03:40 10 -> anon_inode:[eventpoll]
lr-x------. 1 named named 64 Mar 25 03:40 11 -> /usr/share/GeoIP/GeoIP-initial.dat
lr-x------. 1 named named 64 Mar 25 03:40 12 -> /usr/share/GeoIP/GeoIPv6-initial.dat
lr-x------. 1 named named 64 Mar 25 03:40 13 -> /dev/random
l-wx------. 1 named named 64 Mar 25 03:40 14 -> /var/named/data/named.run
lrwx------. 1 named named 64 Mar 25 03:40 2 -> /dev/null
lrwx------. 1 named named 64 Mar 25 03:40 20 -> socket:[23128]
lrwx------. 1 named named 64 Mar 25 03:40 21 -> socket:[23142]
lrwx------. 1 named named 64 Mar 25 03:40 22 -> socket:[23144]
lrwx------. 1 named named 64 Mar 25 03:40 23 -> socket:[23146]
lrwx------. 1 named named 64 Mar 25 03:40 24 -> socket:[23149]
lrwx------. 1 named named 64 Mar 25 03:40 25 -> socket:[23150]
lrwx------. 1 named named 64 Mar 25 03:40 3 -> socket:[23104]
lr-x------. 1 named named 64 Mar 25 03:40 4 -> /var/lib/sss/mc/initgroups
lrwx------. 1 named named 64 Mar 25 03:40 5 -> socket:[23109]
lrwx------. 1 named named 64 Mar 25 03:40 512 -> socket:[23140]
lrwx------. 1 named named 64 Mar 25 03:40 513 -> socket:[23143]
lrwx------. 1 named named 64 Mar 25 03:40 514 -> socket:[23145]
lrwx------. 1 named named 64 Mar 25 03:40 6 -> /dev/null
lr-x------. 1 named named 64 Mar 25 03:40 7 -> pipe:[23118]
l-wx------. 1 named named 64 Mar 25 03:40 9 -> pipe:[23118]
lsof -p 1439|grep socket
named 1439 named 3u unix 0xffff996433a0e600 0t0 23104 socket
named 1439 named 5u unix 0xffff996433a0ea40 0t0 23109 socket

why in lsof i see less soclet that in ls -l /proc/?
Last edited by linuly; 03-25-2021 at 03:01 AM.
 
Old 03-25-2021, 03:03 AM   #2
pan64
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why not?
An so is only opened if really required.
 
Old 03-25-2021, 04:40 AM   #3
business_kid
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The only use case I find profitable is
Code:
lss <program> |grep found
And if that throws up anything, you have issues. Otherwise, why bother? I imagine purely internal factors of how the program was structured/written affect what use it made of dependencies. If the programmer is a game, all libraries will be wanted now to avoid delays. If the programmer tries to keep the overhead low, stuff can be called as required only and closed afterwards.
 
Old 03-25-2021, 05:25 AM   #4
berndbausch
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Quote:
Originally Posted by linuly View Post
Code:
 ls -l /proc/1439/fd
total 0
lrwx------. 1 named named 64 Mar 25 03:40 0 -> /dev/null
lrwx------. 1 named named 64 Mar 25 03:40 1 -> /dev/null
lrwx------. 1 named named 64 Mar 25 03:40 10 -> anon_inode:[eventpoll]
lr-x------. 1 named named 64 Mar 25 03:40 11 -> /usr/share/GeoIP/GeoIP-initial.dat
lr-x------. 1 named named 64 Mar 25 03:40 12 -> /usr/share/GeoIP/GeoIPv6-initial.dat
lr-x------. 1 named named 64 Mar 25 03:40 13 -> /dev/random
l-wx------. 1 named named 64 Mar 25 03:40 14 -> /var/named/data/named.run
lrwx------. 1 named named 64 Mar 25 03:40 2 -> /dev/null
lrwx------. 1 named named 64 Mar 25 03:40 20 -> socket:[23128]
lrwx------. 1 named named 64 Mar 25 03:40 21 -> socket:[23142]
lrwx------. 1 named named 64 Mar 25 03:40 22 -> socket:[23144]
lrwx------. 1 named named 64 Mar 25 03:40 23 -> socket:[23146]
lrwx------. 1 named named 64 Mar 25 03:40 24 -> socket:[23149]
lrwx------. 1 named named 64 Mar 25 03:40 25 -> socket:[23150]
lrwx------. 1 named named 64 Mar 25 03:40 3 -> socket:[23104]
lr-x------. 1 named named 64 Mar 25 03:40 4 -> /var/lib/sss/mc/initgroups
lrwx------. 1 named named 64 Mar 25 03:40 5 -> socket:[23109]
lrwx------. 1 named named 64 Mar 25 03:40 512 -> socket:[23140]
lrwx------. 1 named named 64 Mar 25 03:40 513 -> socket:[23143]
lrwx------. 1 named named 64 Mar 25 03:40 514 -> socket:[23145]
lrwx------. 1 named named 64 Mar 25 03:40 6 -> /dev/null
lr-x------. 1 named named 64 Mar 25 03:40 7 -> pipe:[23118]
l-wx------. 1 named named 64 Mar 25 03:40 9 -> pipe:[23118]
lsof -p 1439|grep socket
named 1439 named 3u unix 0xffff996433a0e600 0t0 23104 socket
named 1439 named 5u unix 0xffff996433a0ea40 0t0 23109 socket

why in lsof i see less soclet that in ls -l /proc/?
I would check what lsof says about file descriptors 20..25.
 
Old 03-25-2021, 05:32 AM   #5
pan64
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again, a misleading title. How is ldd related to those sockets?
 
  


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