Re: [PATCH] Use a separate variable for the size passed to sysctl.

[John Baldwin <jhb@freebsd.org>]

On Tuesday, January 19, 2016 07:18:49 PM Pedro Alves wrote:
> OK with ...
> 
> On 01/19/2016 06:24 PM, John Baldwin wrote:
> > --- a/gdb/ChangeLog
> > +++ b/gdb/ChangeLog
> > @@ -1,5 +1,10 @@
> >  2016-01-19  John Baldwin  <jhb@FreeBSD.org>
> >  
> > +	* fbsd-tdep.c (fbsd_pid_to_exec_file): Use new "buflen" instead of
> > +	"len" with sysctl.
> 
> ... should be "fbsd-nat.c".

Err, yes.  I also noticed after mailing that the 'len' variable is now
initialized unnecessarily (since it's value is always overwritten by the
call to readlink() after the #endif).  Is it ok to push this modified
version:

--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -43,18 +43,20 @@
 static char *
 fbsd_pid_to_exec_file (struct target_ops *self, int pid)
 {
-  ssize_t len = PATH_MAX;
+  ssize_t len;
   static char buf[PATH_MAX];
   char name[PATH_MAX];
 
 #ifdef KERN_PROC_PATHNAME
+  size_t buflen;
   int mib[4];
 
   mib[0] = CTL_KERN;
   mib[1] = KERN_PROC;
   mib[2] = KERN_PROC_PATHNAME;
   mib[3] = pid;
-  if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
+  buflen = sizeof buf;
+  if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
     return buf;
 #endif

-- 
John Baldwin