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/* The kernel call implemented in this file:
* m_type: SYS_EXEC
*
* The parameters for this kernel call are:
* m_lsys_krn_sys_exec.endpt (process that did exec call)
* m_lsys_krn_sys_exec.stack (new stack pointer)
* m_lsys_krn_sys_exec.name (pointer to program name)
* m_lsys_krn_sys_exec.ip (new instruction pointer)
* m_lsys_krn_sys_exec.ps_str (struct ps_strings *)
*/
#include "kernel/system.h"
#include <string.h>
#include <minix/endpoint.h>
#if USE_EXEC
/*===========================================================================*
* do_exec *
*===========================================================================*/
int do_exec(struct proc * caller, message * m_ptr)
{
/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
register struct proc *rp;
int proc_nr;
char name[PROC_NAME_LEN];
if(!isokendpt(m_ptr->m_lsys_krn_sys_exec.endpt, &proc_nr))
return EINVAL;
rp = proc_addr(proc_nr);
if(rp->p_misc_flags & MF_DELIVERMSG) {
rp->p_misc_flags &= ~MF_DELIVERMSG;
}
/* Save command name for debugging, ps(1) output, etc. */
if(data_copy(caller->p_endpoint, m_ptr->m_lsys_krn_sys_exec.name,
KERNEL, (vir_bytes) name,
(phys_bytes) sizeof(name) - 1) != OK)
strncpy(name, "<unset>", PROC_NAME_LEN);
name[sizeof(name)-1] = '\0';
/* Set process state. */
arch_proc_init(rp,
(u32_t) m_ptr->m_lsys_krn_sys_exec.ip,
(u32_t) m_ptr->m_lsys_krn_sys_exec.stack,
(u32_t) m_ptr->m_lsys_krn_sys_exec.ps_str, name);
/* No reply to EXEC call */
RTS_UNSET(rp, RTS_RECEIVING);
/* Mark fpu_regs contents as not significant, so fpu
* will be initialized, when it's used next time. */
rp->p_misc_flags &= ~MF_FPU_INITIALIZED;
/* force reloading FPU if the current process is the owner */
release_fpu(rp);
return(OK);
}
#endif /* USE_EXEC */
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