From: Bart Van Assche <bvanassche@acm.org>
Date: Thu, 1 May 2008 12:23:48 +0000 (+0000)
Subject: Added documentation for PRINT() macro in syscall wrappers.
X-Git-Tag: svn/VALGRIND_3_4_0~668
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=60210b24d7bf8535ede578282f87a82fc5e94d91;p=thirdparty%2Fvalgrind.git

Added documentation for PRINT() macro in syscall wrappers.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7969
---

diff --git a/README_MISSING_SYSCALL_OR_IOCTL b/README_MISSING_SYSCALL_OR_IOCTL
index 603295bbd9..2f4e81d7e1 100644
--- a/README_MISSING_SYSCALL_OR_IOCTL
+++ b/README_MISSING_SYSCALL_OR_IOCTL
@@ -63,10 +63,12 @@ The wrapper for the time system call looks like this:
      }
   }
 
-The first thing we do happens before the syscall occurs, in the PRE() function:
-tell the tool the return type of the syscall, that the syscall has one
-argument, the type of the argument and that the argument is being read from a
-register:
+The first thing we do happens before the syscall occurs, in the PRE() function.
+The PRE() function typically starts with invoking to the PRINT() macro. This
+PRINT() macro implements support for the --trace-syscalls command line option.
+Next, the tool is told the return type of the syscall, that the syscall has
+one argument, the type of the syscall argument and that the argument is being
+read from a register:
 
      PRE_REG_READ1(long, "time", int *, t);