From 6c60db8ce99eabdbfcbe0f78a50817494142e39e Mon Sep 17 00:00:00 2001
From: "Timothy M. Jones" <tjones1@inf.ed.ac.uk>
Date: Sat, 24 Oct 2009 10:53:57 -0700
Subject: syscall: Implementation of the times system call

---
 src/kern/linux/linux.hh | 11 +++++++++++
 src/sim/syscall_emul.hh | 24 ++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/src/kern/linux/linux.hh b/src/kern/linux/linux.hh
index 7c16228ea..2df323712 100644
--- a/src/kern/linux/linux.hh
+++ b/src/kern/linux/linux.hh
@@ -136,6 +136,17 @@ class Linux : public OperatingSystem
         int64_t tv_usec;        //!< microseconds
     };
 
+    /// Clock ticks per second, for times().
+    static const int _SC_CLK_TCK = 100;
+
+    /// For times().
+    struct tms {
+        int64_t tms_utime;      //!< user time
+        int64_t tms_stime;      //!< system time
+        int64_t tms_cutime;     //!< user time of children
+        int64_t tms_cstime;     //!< system time of children
+    };
+
     // For writev/readv
     struct tgt_iovec {
         uint64_t iov_base; // void *
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index e45a6c797..ce7c7fa87 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -1131,6 +1131,30 @@ getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
     return 0;
 }
 
+/// Target times() function.
+template <class OS>
+SyscallReturn
+timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+           ThreadContext *tc)
+{
+    TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, 0));
+
+    // Fill in the time structure (in clocks)
+    int64_t clocks = curTick * OS::_SC_CLK_TCK / Clock::Int::s;
+    bufp->tms_utime = clocks;
+    bufp->tms_stime = 0;
+    bufp->tms_cutime = 0;
+    bufp->tms_cstime = 0;
+
+    // Convert to host endianness
+    bufp->tms_utime = htog(bufp->tms_utime);
+
+    // Write back
+    bufp.copyOut(tc->getMemPort());
+
+    // Return clock ticks since system boot
+    return clocks;
+}
 
 
 
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