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LibC: Add posix_spawn()!
All the file actions stuff is still missing for now, as is POSIX_SPAWN_SETSCHEDULER (not sure what that's supposed to do) and POSIX_SPAWN_RESETIDS. Implemented in userspace for now. Once there are users, it'll likely make sense to make this a syscall for performance reasons. A simple test program of the form extern char **environ; int main(int argc, char* argv[]) { pid_t pid; char* args[] = { "ls", NULL }; posix_spawnp(&pid, "ls", nullptr, nullptr, args, environ); } works fine.
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@ -25,6 +25,7 @@ set(LIBC_SOURCES
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serenity.cpp
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setjmp.S
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signal.cpp
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spawn.cpp
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stat.cpp
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stdio.cpp
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stdlib.cpp
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