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(de)allocate linux emuldata on fork/exec/exit as needed

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This commit is contained in:
jdolecek 2000-11-21 12:23:29 +00:00
parent 33d7a60ccc
commit a53687b13e
1 changed files with 56 additions and 1 deletions
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57
sys/compat/linux/common/linux_exec.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_exec.c,v 1.38 2000/11/21 00:37:53 jdolecek Exp $ */
/* $NetBSD: linux_exec.c,v 1.39 2000/11/21 12:23:29 jdolecek Exp $ */
/*-
* Copyright (c) 1994, 1995, 1998 The NetBSD Foundation, Inc.
@ -64,6 +64,7 @@
#include <compat/linux/linux_syscall.h>
#include <compat/linux/common/linux_misc.h>
#include <compat/linux/common/linux_errno.h>
#include <compat/linux/common/linux_emuldata.h>
const char linux_emul_path[] = "/emul/linux";
@ -71,6 +72,10 @@ extern struct sysent linux_sysent[];
extern const char * const linux_syscallnames[];
extern char linux_sigcode[], linux_esigcode[];
static void linux_e_proc_exec __P((struct proc *, struct exec_package *));
static void linux_e_proc_fork __P((struct proc *, struct proc *));
static void linux_e_proc_exit __P((struct proc *));
/*
* Execve(2). Just check the alternate emulation path, and pass it on
* to the NetBSD execve().
@ -112,4 +117,54 @@ const struct emul emul_linux = {
linux_syscallnames,
linux_sigcode,
linux_esigcode,
linux_e_proc_exec,
linux_e_proc_fork,
linux_e_proc_exit,
};
/*
* Allocate per-process structures. Called when executing Linux
* process. We can re-used the old emuldata - if it's not null,
* the executed process is of same emulation as original forked one.
*/
static void
linux_e_proc_exec(p, epp)
struct proc *p;
struct exec_package *epp;
{
if (!p->p_emuldata) {
/* allocate new Linux emuldata */
MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata),
M_EMULDATA, M_WAITOK);
}
memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata));
}
/*
* Emulation per-process exit hook.
*/
static void
linux_e_proc_exit(p)
struct proc *p;
{
/* free Linux emuldata and set the pointer to null */
FREE(p->p_emuldata, M_EMULDATA);
p->p_emuldata = NULL;
}
/*
* Emulation fork hook.
*/
static void
linux_e_proc_fork(p, parent)
struct proc *p, *parent;
{
/*
* It could be desirable to copy some stuff from parent's
* emuldata. We don't need anything like that for now.
* So just allocate new emuldata for the new process.
*/
p->p_emuldata = NULL;
linux_e_proc_exec(p, NULL);
}