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Added documentation for PRINT() macro in syscall wrappers.

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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7969
This commit is contained in:
Bart Van Assche 2008-05-01 12:23:48 +00:00
parent 829c08bedc
commit 60210b24d7
1 changed files with 6 additions and 4 deletions
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10
README_MISSING_SYSCALL_OR_IOCTL
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@ -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);