获取管道中的命令输出,C代表Linux

我需要运行Linux CLI命令并从C获取其stdout输出.

我可以使用pipe()创建一个管道,然后使用fork/exec,在调用exec()之前将child的stdout描述符重定向到管道,并从父管道中读取.另外,我需要等孩子.

是否有一个简单的调用fork + redirect + exec + wait,就像system()执行fork + exec + wait一样,只有system()不执行重定向.

有popen(),它执行fork + redirect + exec,但是没有等待,所以我无法获得退出状态.

是这个吗？

NAME
       popen, pclose - process I/O

SYNOPSIS
       #include   

       FILE *popen(const char *command, const char *type);

       int pclose(FILE *stream);

DESCRIPTION
       The  popen()  function opens a process by creating a pipe, forking, 
and invoking the shell.  Since a pipe is by definition unidirectional, the 
type argument may specify only reading or writing, not both; the resulting 
stream is correspondingly read-only or write-only.

       The command argument is a pointer to a null-terminated string 
containing a shell command line.  This command is passed to /bin/sh 
using the -c flag; interpretation, if any, is performed by the shell.  
The type argument is a pointer to a null-terminated string which must be 
either ‘r’ for reading or ‘w’ for writing.

       The  return  value  from popen() is a normal standard I/O stream in 
all respects save that it must be closed with pclose() rather than fclose().  
Writing to such a stream writes to the standard input of the command; the 
command’s standard output is the same as that of the process that called 
popen(), unless this is altered by the command itself.  Conversely, reading 
from a ‘‘popened’’ stream reads the command’s standard output, and the 
command’s standard input is the same as that of the process that called 
popen().

       Note that output popen() streams are fully buffered by default.

       The pclose() function waits for the associated process to terminate 
and returns the exit status of the command as returned by wait4().