OSX: Why is GetProcessInformation() causing a segfault?
- by anthony
Here's my C method to get the pid of the Finder process. GetProcessInformation() is causing a segfault. Why?
Here's the function:
static OSStatus
GetFinderPID(pid_t *pid)
{
ProcessSerialNumber psn = {kNoProcess, kNoProcess};
ProcessInfoRec info;
OSStatus status = noErr;
info.processInfoLength = sizeof(ProcessInfoRec);
info.processName = nil;
while (!status)
{
status = GetNextProcess(&psn);
if (!status)
{
status = GetProcessInformation(&psn, &info);
}
if (!status &&
info.processType == 'FNDR' &&
info.processSignature == 'MACS')
{
return GetProcessPID(&psn, pid);
}
}
return status;
}
Here's the backtrace:
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000032aaaba7
0x00007fffffe00623 in __bzero ()
(gdb) bt
#0 0x00007fffffe00623 in __bzero ()
#1 0x00007fff833adaed in CreateFSRef ()
#2 0x00007fff833ab53b in FSPathMakeRefInternal ()
#3 0x00007fff852fc32d in _CFGetFSRefFromURL ()
#4 0x00007fff852fbfe0 in CFURLGetFSRef ()
#5 0x00007fff85dd273f in GetProcessInformation ()
#6 0x0000000100000bef in GetFinderPID [inlined] () at /path/to/main.c:21
