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Implement fork()!

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This is quite cool! The syscall entry point plumbs the register dump
down to sys$fork(), which uses it to set up the child process's TSS
in order to resume execution right after the int 0x80 fork() call. :^)

This works pretty well, although there is some problem with the kernel
alias mappings used to clone the parent process's regions. If I disable
the MM::release_page_directory() code, there's no problem. Probably there's
a premature freeing of a physical page somehow.
This commit is contained in:
Andreas Kling 2018-11-02 20:41:58 +01:00
parent 10b666f69a
commit 8accc92c3c
16 changed files with 228 additions and 78 deletions
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12
Userland/sh.cpp
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@ -32,6 +32,13 @@ static int sh_pwd(int, const char**)
return 0;
}
static int sh_fork(int, const char**)
{
pid_t pid = fork();
printf("getpid()=%d, fork()=%d\n", getpid(), pid);
return 0;
}
static int sh_exit(int, const char**)
{
printf("Good-bye!\n");
@ -94,6 +101,11 @@ static bool handle_builtin(int argc, const char** argv, int& retval)
retval = sh_exit(argc, argv);
return true;
}
if (!strcmp(argv[0], "fork")) {
retval = sh_fork(argc, argv);
return true;
}
return false;
}