c - OSX : Why is GetProcessInformation() causing a segfault?

这是我获取 Finder 进程 pid 的 C 方法。 GetProcessInformation() 导致段错误。为什么？

这是函数:

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;
}

这是回溯:

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

最佳答案

将 ProcessInfoRect 结构清零是有效的，而不是试图确定应将哪些单个字段清零。

关于c - OSX : Why is GetProcessInformation() causing a segfault?，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/2589501/