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https://github.com/Mathewnd/Astral.git
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Matheus
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
#include <kernel/syscalls.h>
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#include <kernel/vmm.h>
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#include <errno.h>
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#include <arch/spinlock.h>
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#include <kernel/sched.h>
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#include <arch/cls.h>
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#include <arch/regs.h>
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syscallret syscall_fork(arch_regs* ctx){
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syscallret retv;
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retv.ret = -1;
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thread_t* newthread = sched_newuthread(NULL, PAGE_SIZE*10, NULL, NULL, false, THREAD_PRIORITY_USER);
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if(!newthread){
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retv.errno = ENOMEM;
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return retv;
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}
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proc_t* newproc = newthread->proc;
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thread_t* thread = arch_getcls()->thread;
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proc_t* proc = thread->proc;
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spinlock_acquire(&proc->lock);
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fd_tableclone(&proc->fdtable, &newproc->fdtable);
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int err = vmm_fork(thread->ctx, newthread->ctx);
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if(err){
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vmm_destroy(newthread->ctx);
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free(newthread->regs);
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free(newthread->kernelstackbase);
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free(newthread);
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retv.errno = err;
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return retv;
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}
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newproc->parent = proc;
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newproc->sibling = proc->child;
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proc->child = newproc;
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newproc->gid = proc->gid;
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newproc->uid = proc->uid;
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newproc->umask = proc->umask;
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vfs_acquirenode(proc->root);
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vfs_acquirenode(proc->cwd);
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newproc->root = proc->root;
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newproc->cwd = proc->cwd;
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memcpy(newthread->regs, ctx, sizeof(arch_regs));
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arch_regs_saveextra(&newthread->extraregs);
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arch_regs_setret(newthread->regs, 0);
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arch_regs_seterrno(newthread->regs, 0);
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spinlock_release(&proc->lock);
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sched_queuethread(newthread);
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retv.errno = 0;
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retv.ret = newproc->pid;
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return retv;
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}
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