FORK_FAILURE 297 src/subshell/common.c my_exit (FORK_FAILURE); FORK_FAILURE 432 src/subshell/common.c my_exit (FORK_FAILURE); FORK_FAILURE 491 src/subshell/common.c my_exit (FORK_FAILURE); FORK_FAILURE 1980 src/subshell/common.c if (WIFEXITED (status) && WEXITSTATUS (status) != FORK_FAILURE)