134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/file.h"
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#include "linux/fs.h"
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#include "linux/mm.h"
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#include "linux/sched.h"
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#include "linux/utsname.h"
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#include "asm/current.h"
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#include "asm/mman.h"
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#include "asm/uaccess.h"
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#include "asm/unistd.h"
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long sys_fork(void)
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{
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long ret;
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current->thread.forking = 1;
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ret = do_fork(SIGCHLD, UPT_SP(¤t->thread.regs.regs),
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¤t->thread.regs, 0, NULL, NULL);
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current->thread.forking = 0;
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return ret;
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}
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long sys_vfork(void)
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{
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long ret;
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current->thread.forking = 1;
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ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
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UPT_SP(¤t->thread.regs.regs),
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¤t->thread.regs, 0, NULL, NULL);
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current->thread.forking = 0;
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return ret;
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}
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/* common code for old and new mmaps */
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long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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long error = -EBADF;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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long old_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long offset)
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{
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long err = -EINVAL;
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if (offset & ~PAGE_MASK)
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goto out;
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err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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out:
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return err;
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}
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long sys_uname(struct old_utsname __user * name)
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{
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long err;
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if (!name)
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return -EFAULT;
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down_read(&uts_sem);
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err = copy_to_user(name, utsname(), sizeof (*name));
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up_read(&uts_sem);
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return err?-EFAULT:0;
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}
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long sys_olduname(struct oldold_utsname __user * name)
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{
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long error;
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if (!name)
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return -EFAULT;
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if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
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return -EFAULT;
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down_read(&uts_sem);
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error = __copy_to_user(&name->sysname, &utsname()->sysname,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->nodename, &utsname()->nodename,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->release, &utsname()->release,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->release + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->version, &utsname()->version,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->version + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->machine, &utsname()->machine,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->machine + __OLD_UTS_LEN);
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up_read(&uts_sem);
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error = error ? -EFAULT : 0;
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return error;
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}
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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mm_segment_t fs;
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int ret;
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fs = get_fs();
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set_fs(KERNEL_DS);
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ret = um_execve(filename, argv, envp);
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set_fs(fs);
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return ret;
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}
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