c++ - 如何判断 popen() 是否成功？

Question

你怎么知道 popen() 是成功/完成运行 shell 还是失败？

Answer 1

popen return value :

Upon successful completion, popen() shall return a pointer to an open stream that can be used to read or write to the pipe. Otherwise, it shall return a null pointer and may set errno to indicate the error.

fp = popen("ls *", "r");
if (fp == NULL)
    /* Handle error */;