sys/syscall_pcb.c


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#include "api/error.h"
#include "jove.h"
#include "lib/printf.h"
#include "proc/process.h"
#include "proc/scheduler.h"
#include "syscall.h"
#include "errno.h"

int
s_syscall_pcb_yield(jove_owned_obj_t *pcb_obj,
        size_t bytes_left,
        void *payload_data)
{
    size_t bytes_needed = sizeof(pid_t);
    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for payload");

    pid_t subject_pid = *((pid_t*)payload_data);
    return scheduler_yield(subject_pid);
}

int
_syscall_handle_pcb(syscall_context_t *ctx)
{
    switch(ctx->header->callid) {
        case SYSCALL_PCB_YIELD:
            if(ctx->target.permissions & SYSCALL_PERM_PCB_YIELD)
                return s_syscall_pcb_yield(ctx->target.obj, ctx->bytes_left, ctx->payload);
            return -EPERM;

        default:
            return -EBADCALL;
    }
}