Add helper functions proc_readmem() and proc_writemem().

These helper functions can be used to read in or write a buffer from or to
an arbitrary process' address space. Without them, this can only be done
using proc_rwmem(), which requires the caller to fill out a uio. This is
onerous and results in code duplication; the new functions provide a simpler
interface which is sufficient for most existing callers of proc_rwmem().

This change also adds a manual page for proc_rwmem() and the new functions.

Reviewed by:	jhb, kib
Differential Revision:	https://reviews.freebsd.org/D4245

1 files changed, 4 insertions, 0 deletions

diff --git a/sys/sys/ptrace.h b/sys/sys/ptrace.h
index 71357671b23e..7ccd3d6cd596 100644
--- a/sys/sys/ptrace.h
+++ b/sys/sys/ptrace.h
@@ -166,6 +166,10 @@ int	proc_read_dbregs(struct thread *_td, struct dbreg *_dbreg);
 int	proc_write_dbregs(struct thread *_td, struct dbreg *_dbreg);
 int	proc_sstep(struct thread *_td);
 int	proc_rwmem(struct proc *_p, struct uio *_uio);
+ssize_t	proc_readmem(struct thread *_td, struct proc *_p, vm_offset_t _va,
+	    void *_buf, size_t _len);
+ssize_t	proc_writemem(struct thread *_td, struct proc *_p, vm_offset_t _va,
+	    void *_buf, size_t _len);
 #ifdef COMPAT_FREEBSD32
 struct reg32;
 struct fpreg32;