==7802== Syscall param write(buf) points to uninitialised byte(s)
==7802==    at 0x54485A0: __write_nocancel (syscall-template.S:81)
==7802==    by 0x53D5EF2: _IO_file_write@@GLIBC_2.2.5 (fileops.c:1253)
==7802==    by 0x53D73CB: new_do_write (fileops.c:530)
==7802==    by 0x53D73CB: _IO_do_write@@GLIBC_2.2.5 (fileops.c:503)
==7802==    by 0x53D8F4D: _IO_flush_all_lockp (genops.c:848)
==7802==    by 0x53D90A9: _IO_cleanup (genops.c:1013)
==7802==    by 0x539765A: __run_exit_handlers (exit.c:95)
==7802==    by 0x53976F4: exit (exit.c:104)
==7802==    by 0x537EECB: (below main) (libc-start.c:321)
==7802==  Address 0x4027013 is not stack'd, malloc'd or (recently) free'd