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Changes to make sure after a fork a child process can safely return.

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This copies the parent kernel stack to child only for the part where
the previous context is saved. Then the child registers are modified
so that it would begin execution from returning of the system call.
This commit is contained in:
Bahadir Balban
2008-08-21 16:21:08 +03:00
parent dada3e0b2c
commit 3ce220f062
7 changed files with 84 additions and 21 deletions
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6
src/api/ipc.c
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@@ -47,7 +47,7 @@ int ipc_msg_copy(struct ktcb *to, struct ktcb *from)
return 0;
}
int sys_ipc_control(struct syscall_args *regs)
int sys_ipc_control(syscall_context_t *regs)
{
return -ENOSYS;
}
@@ -212,7 +212,7 @@ static inline int __sys_ipc(l4id_t to, l4id_t from, unsigned int ipc_type)
return ret;
}
void printk_sysregs(struct syscall_args *regs)
void printk_sysregs(syscall_context_t *regs)
{
printk("System call registers for tid: %d\n", current->tid);
printk("R0: %x\n", regs->r0);
@@ -234,7 +234,7 @@ void printk_sysregs(struct syscall_args *regs)
* - Can propagate messages from third party threads.
* - A thread can both send and receive on the same call.
*/
int sys_ipc(struct syscall_args *regs)
int sys_ipc(syscall_context_t *regs)
{
l4id_t to = (l4id_t)regs->r0;
l4id_t from = (l4id_t)regs->r1;