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Changed lseek(2): return EINVAL upon attempt to seek to negative offset.

This commit is contained in:
kleink 1997-04-04 13:57:06 +00:00
parent 50ccaeca39
commit 9d8538dd8b
1 changed files with 9 additions and 5 deletions
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14
sys/kern/vfs_syscalls.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_syscalls.c,v 1.80 1997/04/04 13:32:48 kleink Exp $ */
/* $NetBSD: vfs_syscalls.c,v 1.81 1997/04/04 13:57:06 kleink Exp $ */
/*
* Copyright (c) 1989, 1993
@ -1124,6 +1124,7 @@ sys_lseek(p, v, retval)
register struct filedesc *fdp = p->p_fd;
register struct file *fp;
struct vattr vattr;
register off_t newoff;
int error;
if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles ||
@ -1137,22 +1138,25 @@ sys_lseek(p, v, retval)
return (ESPIPE);
switch (SCARG(uap, whence)) {
case L_INCR:
fp->f_offset += SCARG(uap, offset);
newoff = fp->f_offset + SCARG(uap, offset);
break;
case L_XTND:
error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr,
cred, p);
if (error)
return (error);
fp->f_offset = SCARG(uap, offset) + vattr.va_size;
newoff = SCARG(uap, offset) + vattr.va_size;
break;
case L_SET:
fp->f_offset = SCARG(uap, offset);
newoff = SCARG(uap, offset);
break;
default:
return (EINVAL);
}
*(off_t *)retval = fp->f_offset;
if (newoff < 0)
return (EINVAL);
*(off_t *)retval = fp->f_offset = newoff;
return (0);
}