Linux/C++: getting user's directory without leaks -


what doing wrongly there memory leaks in following code tries read home directory of user?

static std::string gethomedir() {     struct passwd *pw = getpwuid(getuid());     std::string res( pw->pw_dir);     endpwent();     return res; }

valgrind complains:

==32757== 160 (40 direct, 120 indirect) bytes in 1 blocks lost in loss record 42 of 48 ==32757==    @ 0x402bb7a: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so) ==32757==    0x456e84e: nss_parse_service_list (nsswitch.c:678) ==32757==    0x456efc9: __nss_database_lookup (nsswitch.c:175) ==32757==    0x4a8e168: ??? ==32757==    0x4a8fb5c: ??? ==32757==    0x4525fa6: getpwuid_r@@glibc_2.1.2 (getxxbyyy_r.c:256) ==32757==    0x45258ed: getpwuid (getxxbyyy.c:117) ==32757==    0x805ad56: gethomedir() (configreader.cpp:73)

(also, sidenote: man getpwuid show example program, leaks same amount of memory...)

(and want compare linuxes:

uname -a gives linux reference 3.5.0-47-generic #71-ubuntu smp tue feb 18 23:59:30 utc 2014 i686 athlon i686 gnu/linux ... ubuntu 12.10

this known bug:

nss_parse_service_list leaks tiny amount of memory

it considered resolved "wontfix", comment stating "the memory allocated once hold global state, , isn't freed."


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