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*
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*
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******************************************************************************/
//----------------------------------------------------------------------------------------------------//
//! @file libprocess.c
//! This contains system call wrapper functions for Process Management.
//----------------------------------------------------------------------------------------------------//
#include <os_config.h>
#include <sys/process.h>
#include <sys/syscall.h>
#include <sys/stats.h>
#include <sys/ktypes.h>

reent_t  *lreent = NULL;

extern void* make_syscall (void *arg1, void *arg2, void *arg3, void *arg4, void *arg5, int syscall_num);

reent_t* get_reentrancy (void)
{
    return (reent_t*) make_syscall (NULL, NULL, NULL, NULL, NULL, SC_GET_REENTRANCY);
}

#ifdef CONFIG_ELF_PROCESS
pid_t elf_process_create (void* start, int prio) 
{
    return (int) make_syscall (start, (void*)prio, NULL, NULL, NULL, SC_PROCESS_CREATE);
}

int elf_process_exit (void)
{
    return (int) make_syscall ( NULL, NULL, NULL, NULL, NULL, SC_PROCESS_EXIT);
}
#endif

#ifdef CONFIG_KILL
int kill (pid_t pid)
{
    return (int) make_syscall ((void*)(int)pid, NULL, NULL, NULL, NULL, SC_PROCESS_KILL);
}
#endif

int process_status (pid_t pid, p_stat *ps)
{
    return (int) make_syscall ((void*)(int)pid, (void*)ps, NULL, NULL, NULL, SC_PROCESS_STATUS);
}

pid_t get_currentPID (void)
{
    return (int) make_syscall (NULL, NULL, NULL, NULL, NULL, SC_PROCESS_GETPID);    
}

#ifdef CONFIG_YIELD
int yield (void)
{
    return (int) make_syscall (NULL, NULL, NULL, NULL, NULL, SC_PROCESS_YIELD);    
}
#endif /* CONFIG_YIELD */

#ifdef CONFIG_STATS
int get_kernel_stats (kstats_t *stats)
{
    return (int) make_syscall ((void*)stats, NULL, NULL, NULL, NULL, SC_GET_KERNEL_STATS);
}
#endif


int*   __errno (void)
{
    if (lreent == NULL)
        lreent = get_reentrancy ();

    return &(lreent->_errno);
}