[mozumder]

Does this affect FreeBSD as well?

[loeg]

Experimentally, no. The example program calls localtime(3) 10 times but only accesses the file once, per truss:

    write(1,"Greetings!n",11)			 = 11 (0xb)
    access("/etc/localtime",R_OK)			 = 0 (0x0)
    open("/etc/localtime",O_RDONLY,037777777600)	 = 3 (0x3)
    fstat(3,{ mode=-r--r--r-- ,inode=11316113,size=2819,blksize=32768 }) = 0 (0x0)
    read(3,"TZif20000000000000"...,41448) = 2819 (0xb03)
    close(3)					 = 0 (0x0)
    issetugid()					 = 0 (0x0)
    open("/usr/share/zoneinfo/posixrules",O_RDONLY,00) = 3 (0x3)
    fstat(3,{ mode=-r--r--r-- ,inode=327579,size=3519,blksize=32768 }) = 0 (0x0)
    read(3,"TZif20000000000000"...,41448) = 3519 (0xdbf)
    close(3)					 = 0 (0x0)
    write(1,"Godspeed, dear friend!n",23)		 = 23 (0x17)

(FreeBSD caches the database on the first call: https://svnweb.freebsd.org/base/head/contrib/tzcode/stdtime/... )

[rini17]

It is unlikely, they usually don't use GNU C library.