应用程序在 pclose 时崩溃

Question

我有一个使用 popen 解析命令行输出的应用程序。但是，在 Android 上测试时，它会在 pclose 上崩溃：为什么？在其他 Unix 环境中测试时我没有错误...

char commandLine[256] = "ps -A | grep -c myApplication";

FILE * fPipe = popen(commandLine, "r");

if (fPipe == NULL)
    return 0;

int count = -1;
fscanf(fPipe, "%d", &count);

///If here I print count, I get zero, which is correct...

pclose(fPipe); ///Here it crashes!

return count;

更新： 看来使用 popen 无论如何都会导致我的应用程序在稍后阶段崩溃，就好像执行此调用会杀死我的应用程序一样。

Answer 1

popen uses fork which apparently shouldn't be used in Android. To see which processes are running probably the only safe way is to check in the /proc dir. More reading: popen on android NDK

应用程序在 pclose 时崩溃

Application crashing on pclose

c

linux

file-io

android

pipe