$ valgrind --tool=memcheck --leak-check=yes --show-reachable=yes --num-callers=20 --track-origins=yes  ./read_test
==25496== Memcheck, a memory error detector
==25496== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==25496== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==25496== Command: ./read_test
==25496== 
foo
==25496== Conditional jump or move depends on uninitialised value(s)
==25496==    at 0x4EAB5FF: ??? (in /lib/libc-2.14.1.so)
==25496==    by 0x4E9354D: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
==25496== Conditional jump or move depends on uninitialised value(s)
==25496==    at 0x4E9DBBB: _IO_file_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E935CC: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
==25496== Conditional jump or move depends on uninitialised value(s)
==25496==    at 0x4E9DC1F: _IO_file_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E935CC: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
==25496== Conditional jump or move depends on uninitialised value(s)
==25496==    at 0x4E9DC28: _IO_file_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E935CC: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
==25496== Conditional jump or move depends on uninitialised value(s)
==25496==    at 0x4E9F823: _IO_default_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E9DC39: _IO_file_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E935CC: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
==25496== Conditional jump or move depends on uninitialised value(s)
==25496==    at 0x4E9F881: _IO_default_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E9DC39: _IO_file_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E935CC: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
==25496== Use of uninitialised value of size 8
==25496==    at 0x4E9F88B: _IO_default_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E9DC39: _IO_file_xsputn (in /lib/libc-2.14.1.so)
==25496==    by 0x4E935CC: fputs (in /lib/libc-2.14.1.so)
==25496==    by 0x40066A: main (read_test.c:10)
==25496==  Uninitialised value was created by a heap allocation
==25496==    at 0x4C2893D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25496==    by 0x4E93EE1: getdelim (in /lib/libc-2.14.1.so)
==25496==    by 0x400638: main (read_test.c:8)
==25496== 
foo
==25496== 
==25496== HEAP SUMMARY:
==25496==     in use at exit: 0 bytes in 0 blocks
==25496==   total heap usage: 1 allocs, 1 frees, 120 bytes allocated
==25496== 
==25496== All heap blocks were freed -- no leaks are possible
==25496== 
==25496== For counts of detected and suppressed errors, rerun with: -v
==25496== ERROR SUMMARY: 14 errors from 7 contexts (suppressed: 6 from 6)