diff mbox

[V2,2/4] kvm_stat: Print errno when syscall to perf_event_open() fails

Message ID 1422045886-9998-3-git-send-email-wei@redhat.com
State New
Headers show

Commit Message

Wei Huang Jan. 23, 2015, 8:44 p.m. UTC 
kvm_stat uses syscall() to call perf_event_open(). If this function
call fails, the returned value is -1, which doesn't tell the details
of the failure (i.e. ENOSYS or EINVAL). This patch retrieves errno
and prints it when syscall() fails. The error message will look like
"Exception: perf_event_open failed, errno = 38".

Signed-off-by: Wei Huang <wei@redhat.com>
---
 scripts/kvm/kvm_stat | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat
index 7ec84c0..cb23877 100755
--- a/scripts/kvm/kvm_stat
+++ b/scripts/kvm/kvm_stat
@@ -13,6 +13,7 @@ 
 
 import curses
 import sys, os, time, optparse, ctypes
+from ctypes import *
 
 class DebugfsProvider(object):
     def __init__(self):
@@ -239,6 +240,9 @@  import struct, array
 
 libc = ctypes.CDLL('libc.so.6')
 syscall = libc.syscall
+get_errno = libc.__errno_location
+get_errno.restype = POINTER(c_int)
+
 class perf_event_attr(ctypes.Structure):
     _fields_ = [('type', ctypes.c_uint32),
                 ('size', ctypes.c_uint32),
@@ -322,7 +326,8 @@  class Event(object):
             group_leader = group.events[0].fd
         fd = _perf_event_open(attr, -1, group.cpu, group_leader, 0)
         if fd == -1:
-            raise Exception('perf_event_open failed')
+            err = get_errno()[0]
+            raise Exception('perf_event_open failed, errno = ' + err.__str__())
         if filter:
             import fcntl
             fcntl.ioctl(fd, ioctl_numbers['SET_FILTER'], filter)