read(0, negative
"negative\n", 1024)             = 9
_llseek(0, -1, 0xbffff678, SEEK_CUR)    = -1 ESPIPE (Illegal seek)
_llseek(0, -1, 0xbffff678, SEEK_CUR)    = -1 ESPIPE (Illegal seek)
munmap(0xb7fe8000, 4096)                = 0
exit_group(0)