151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include "linux/file.h"
|
|
#include "linux/fs.h"
|
|
#include "linux/mm.h"
|
|
#include "linux/sched.h"
|
|
#include "linux/utsname.h"
|
|
#include "asm/current.h"
|
|
#include "asm/mman.h"
|
|
#include "asm/uaccess.h"
|
|
#include "asm/unistd.h"
|
|
|
|
long sys_fork(void)
|
|
{
|
|
long ret;
|
|
|
|
current->thread.forking = 1;
|
|
ret = do_fork(SIGCHLD, UPT_SP(¤t->thread.regs.regs),
|
|
¤t->thread.regs, 0, NULL, NULL);
|
|
current->thread.forking = 0;
|
|
return ret;
|
|
}
|
|
|
|
long sys_vfork(void)
|
|
{
|
|
long ret;
|
|
|
|
current->thread.forking = 1;
|
|
ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
|
|
UPT_SP(¤t->thread.regs.regs),
|
|
¤t->thread.regs, 0, NULL, NULL);
|
|
current->thread.forking = 0;
|
|
return ret;
|
|
}
|
|
|
|
/* common code for old and new mmaps */
|
|
long sys_mmap2(unsigned long addr, unsigned long len,
|
|
unsigned long prot, unsigned long flags,
|
|
unsigned long fd, unsigned long pgoff)
|
|
{
|
|
long error = -EBADF;
|
|
struct file * file = NULL;
|
|
|
|
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
|
|
if (!(flags & MAP_ANONYMOUS)) {
|
|
file = fget(fd);
|
|
if (!file)
|
|
goto out;
|
|
}
|
|
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
if (file)
|
|
fput(file);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
long old_mmap(unsigned long addr, unsigned long len,
|
|
unsigned long prot, unsigned long flags,
|
|
unsigned long fd, unsigned long offset)
|
|
{
|
|
long err = -EINVAL;
|
|
if (offset & ~PAGE_MASK)
|
|
goto out;
|
|
|
|
err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
|
|
out:
|
|
return err;
|
|
}
|
|
/*
|
|
* sys_pipe() is the normal C calling standard for creating
|
|
* a pipe. It's not the way unix traditionally does this, though.
|
|
*/
|
|
long sys_pipe(unsigned long __user * fildes)
|
|
{
|
|
int fd[2];
|
|
long error;
|
|
|
|
error = do_pipe(fd);
|
|
if (!error) {
|
|
if (copy_to_user(fildes, fd, sizeof(fd)))
|
|
error = -EFAULT;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
long sys_uname(struct old_utsname __user * name)
|
|
{
|
|
long err;
|
|
if (!name)
|
|
return -EFAULT;
|
|
down_read(&uts_sem);
|
|
err = copy_to_user(name, utsname(), sizeof (*name));
|
|
up_read(&uts_sem);
|
|
return err?-EFAULT:0;
|
|
}
|
|
|
|
long sys_olduname(struct oldold_utsname __user * name)
|
|
{
|
|
long error;
|
|
|
|
if (!name)
|
|
return -EFAULT;
|
|
if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
|
|
return -EFAULT;
|
|
|
|
down_read(&uts_sem);
|
|
|
|
error = __copy_to_user(&name->sysname, &utsname()->sysname,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->nodename, &utsname()->nodename,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->release, &utsname()->release,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->release + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->version, &utsname()->version,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->version + __OLD_UTS_LEN);
|
|
error |= __copy_to_user(&name->machine, &utsname()->machine,
|
|
__OLD_UTS_LEN);
|
|
error |= __put_user(0, name->machine + __OLD_UTS_LEN);
|
|
|
|
up_read(&uts_sem);
|
|
|
|
error = error ? -EFAULT : 0;
|
|
|
|
return error;
|
|
}
|
|
|
|
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
mm_segment_t fs;
|
|
int ret;
|
|
|
|
fs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
ret = um_execve(filename, argv, envp);
|
|
set_fs(fs);
|
|
|
|
return ret;
|
|
}
|