https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90038
--- Comment #11 from Janne Blomqvist <jb at gcc dot gnu.org> --- Author: jb Date: Mon May 20 17:43:05 2019 New Revision: 271427 URL: https://gcc.gnu.org/viewcvs?rev=271427&root=gcc&view=rev Log: libfortran/90038 Use posix_spawn, reap dead children when wait=.false. Backport from trunk. When using posix_spawn or fork to launch a child process, the parent needs to wait for the child, otherwise the dead child is left as a zombie process. For this purpose one can install a signal handler for SIGCHLD. 2019-05-20 Janne Blomqvist <j...@gcc.gnu.org> PR libfortran/90038 * intrinsics/execute_command_line (sigchld_handler): New function. (execute_command_line): Install handler for SIGCHLD. * configure.ac: Check for presence of sigaction and waitpid. * config.h.in: Regenerated. * configure: Regenerated. fork() semantics can be problematic. Most unix style OS'es have posix_spawn which can be used to replace fork + exec in many cases. For more information see e.g. https://www.microsoft.com/en-us/research/uploads/prod/2019/04/fork-hotos19.pdf This replaces the one use of fork in libgfortran with posix_spawn. 2019-05-20 Janne Blomqvist <j...@gcc.gnu.org> PR libfortran/90038 * configure.ac (AC_CHECK_FUNCS_ONCE): Check for posix_spawn. * intrinsics/execute_command_line (execute_command_line): Use posix_spawn. * Makefile.in: Regenerated. * config.h.in: Regenerated. * configure: Regenerated. Regtested on x86_64-pc-linux-gnu. Modified: branches/gcc-9-branch/libgfortran/ChangeLog branches/gcc-9-branch/libgfortran/Makefile.in branches/gcc-9-branch/libgfortran/config.h.in branches/gcc-9-branch/libgfortran/configure branches/gcc-9-branch/libgfortran/configure.ac branches/gcc-9-branch/libgfortran/intrinsics/execute_command_line.c
