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/**
* @file proc.c
* Process/thread handling syscall implementations.
*/
#include <apos/elf.h>
#include <apos/uapi.h>
#include <apos/bits.h>
#include <apos/mem_regions.h>
SYSCALL_DEFINE0(create)(){
return (struct sys_ret){ OK, 0 };
}
/* Not entirely sure how I should handle forks/execs etc, mostly whether I
* should allow forks/execs to be called directly or only though the process
* manager. Probably though the process manager, although that will add in a
* slight bit of delay.
*
* I suppose I could add in a runtime parameter
* that would allow them to be called directly, and then the process manager
* would have to periodically ask the kernel about all threads it is aware of
* via sys_sync. Dunno.
*/
SYSCALL_DEFINE0(fork)(){
return (struct sys_ret){ OK, 0 };
}
SYSCALL_DEFINE2(exec)(sys_arg_t bin, sys_arg_t interp){
/* TODO: execute new process, probably with more sensible argc passing */
struct tcb *r = cur_tcb();
/* mark binary to be kept */
struct mem_region *b = find_used_region(&r->sp_r, bin);
if (!b)
return (struct sys_ret){ERR_INVAL, 0};
set_bit(b->flags, MR_KEEP);
struct mem_region *i = 0;
if (interp) {
/* mark interpreter to be kept */
i = find_used_region(&r->sp_r, interp);
if (!i)
return (struct sys_ret){ERR_INVAL, 1};
set_bit(i->flags, MR_KEEP);
}
/* free everything except regions to be kept */
clear_uvmem(r, false);
/* restore to normal */
clear_bit(b->flags, MR_KEEP);
if (interp)
clear_bit(b->flags, MR_KEEP);
/* TODO: set entry? */
load_elf(r, b, i);
return (struct sys_ret){ OK, 0 };
}
SYSCALL_DEFINE2(signal)(sys_arg_t tid, sys_arg_t signal){
/* TODO: signals? */
return (struct sys_ret){ OK, 0 };
}
SYSCALL_DEFINE1(swap)(sys_arg_t tid){
/* TODO: switch to process */
/* TODO: should switch return the registers of the new thread that would
* be used for message passing? */
return (struct sys_ret){ OK, 0 };
}
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