diff options
Diffstat (limited to 'scripts/kvm')
| -rwxr-xr-x | scripts/kvm/kvm_stat | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat index 95c650b1c3..8f6f00715e 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): @@ -247,6 +248,9 @@ 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), @@ -330,7 +334,8 @@ 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) |