FORK_FAILURE 294 src/subshell/common.c my_exit (FORK_FAILURE); FORK_FAILURE 433 src/subshell/common.c my_exit (FORK_FAILURE); FORK_FAILURE 492 src/subshell/common.c my_exit (FORK_FAILURE); FORK_FAILURE 1949 src/subshell/common.c if (WIFEXITED (status) && WEXITSTATUS (status) != FORK_FAILURE)