How to view the dependent libraries of programs and processes in CentOS

How to view the dependent libraries of programs and processes in CentOS
1. Use ldd to view the dependent libraries of executable programs

[root@~]# ldd /usr/local/php/bin/php    linux-vdso.so.1 =>  (0x00007fff753f5000)    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00000031f4600000)    librt.so.1 => /lib64/librt.so.1 (0x000000311ee00000)    libmysqlclient.so.18 => /usr/local/mysql/lib/libmysqlclient.so.18 (0x00007f767b422000)    libmcrypt.so.4 => /usr/lib64/libmcrypt.so.4 (0x00007f767b1ef000)    libiconv.so.2 => /usr/local/lib/libiconv.so.2 (0x00007f767af0a000)    libcurl.so.4 => /usr/lib64/libcurl.so.4 (0x0000003519800000)    libm.so.6 => /lib64/libm.so.6 (0x00000031f2200000)    libdl.so.2 => /lib64/libdl.so.2 (0x00000031f1600000)    libnsl.so.1 => /lib64/libnsl.so.1 (0x00000031f3a00000)    libxml2.so.2 => /usr/lib64/libxml2.so.2 (0x00000031f8a00000)    libz.so.1 => /usr/local/lib/libz.so.1 (0x00007f767acf2000)    libssl.so.10 => /usr/lib64/libssl.so.10 (0x000000311c600000)    libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x00000031f7600000)    libpthread.so.0 => /lib64/libpthread.so.0 (0x000000311ce00000)    libc.so.6 => /lib64/libc.so.6 (0x00000031f0e00000)    libresolv.so.2 => /lib64/libresolv.so.2 (0x00000031f3200000)    libfreebl3.so => /lib64/libfreebl3.so (0x00000031f4e00000)    /lib64/ld-linux-x86-64.so.2 (0x00000031f0a00000)    libidn.so.11 => /lib64/libidn.so.11 (0x00000031f7e00000)    libldap-2.4.so.2 => /lib64/libldap-2.4.so.2 (0x000000351c000000)    libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x000000311f200000)    libkrb5.so.3 => /lib64/libkrb5.so.3 (0x000000311e200000)    libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00000031f7200000)    libcom_err.so.2 => /lib64/libcom_err.so.2 (0x000000311e600000)    libssl3.so => /usr/lib64/libssl3.so (0x000000351b800000)    libsmime3.so => /usr/lib64/libsmime3.so (0x000000351bc00000)    libnss3.so => /usr/lib64/libnss3.so (0x000000351a800000)    libnssutil3.so => /usr/lib64/libnssutil3.so (0x000000351a400000)    libplds4.so => /lib64/libplds4.so (0x000000351ac00000)    libplc4.so => /lib64/libplc4.so (0x000000351b400000)    libnspr4.so => /lib64/libnspr4.so (0x000000351b000000)    libssh2.so.1 => /usr/lib64/libssh2.so.1 (0x0000003519c00000)    liblber-2.4.so.2 => /lib64/liblber-2.4.so.2 (0x000000351a000000)    libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0x00000031f8200000)    libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00000031f7a00000)    libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00000031f6e00000)    libselinux.so.1 => /lib64/libselinux.so.1 (0x00000031f2600000)

Note: ldd calls the dynamic linker to obtain the dependent library of the executable program, but it is not recommended to execute the industry ldd on the unknown executable program to obtain its dependent library, this is because ldd in some versions directly calls the executable program to obtain its dependent libraries, which has security risks.

2. Use the pmap tool to query the dependent libraries of unknown executable programs

[root@~]# objdump -p /usr/local/php/bin/php |grep NEEDED  NEEDED               libcrypt.so.1  NEEDED               librt.so.1  NEEDED               libmysqlclient.so.18  NEEDED               libmcrypt.so.4  NEEDED               libiconv.so.2  NEEDED               libcurl.so.4  NEEDED               libm.so.6  NEEDED               libdl.so.2  NEEDED               libnsl.so.1  NEEDED               libxml2.so.2  NEEDED               libz.so.1  NEEDED               libssl.so.10  NEEDED               libcrypto.so.10  NEEDED               libpthread.so.0  NEEDED               libc.so.6  NEEDED               libresolv.so.2

3. Use pmap to view the dependency library of the running process

The pldd tool can be used to obtain both the memory ing information of the process and the dependent shared library information of the process:

[root@~/software/pldd]# ps -ef|grep php-fpmroot     26534     1  0  2014 ?        00:01:34 php-fpm: master process (/usr/local/php-5.3.29/etc/php-fpm.conf)nobody   26535 26534  0  2014 ?        00:00:04 php-fpm: pool www          nobody   26536 26534  0  2014 ?        00:00:05 php-fpm: pool www          root     30510 30324  0 00:39 pts/0    00:00:00 grep php-fpm[root@~/software/pldd]# pmap 26534 |head 26534:   php-fpm: master process (/usr/local/php-5.3.29/etc/php-fpm.conf)0000000000400000  10452K r-x--  /usr/local/php-5.3.29/sbin/php-fpm0000000001035000     76K rw---  /usr/local/php-5.3.29/sbin/php-fpm0000000001048000    104K rw---    [ anon ]0000000002a65000   3448K rw---    [ anon ]000000311c600000    388K r-x--  /usr/lib64/libssl.so.1.0.1e000000311c661000   2048K -----  /usr/lib64/libssl.so.1.0.1e000000311c861000     16K r----  /usr/lib64/libssl.so.1.0.1e000000311c865000     28K rw---  /usr/lib64/libssl.so.1.0.1e000000311ce00000     92K r-x--  /lib64/libpthread-2.12.so