Question

我在编译代码时遇到这些错误。我在user / include

下有所有标题

g++ -Ip_appmanager/inc -Icore/inc p_appmanager/src/appmanager_process.cpp -o p_appmanager/obj/appmanager -lpthread -lparser
p_appmanager/src/appmanager_process.cpp: In function ‘int main(int, char**)’:
p_appmanager/src/appmanager_process.cpp:33:21: error: ‘getpid’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:101:19: error: ‘fork’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:105:70: error: ‘execl’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:109:19: error: ‘getppid’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:124:19: error: ‘fork’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:128:61: error: ‘execl’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:132:19: error: ‘getppid’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:147:19: error: ‘fork’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:151:73: error: ‘execl’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:155:19: error: ‘getppid’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:170:19: error: ‘fork’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:175:70: error: ‘execl’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:179:19: error: ‘getppid’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp: In function ‘void* pingThread(void*)’:
p_appmanager/src/appmanager_process.cpp:302:11: error: ‘sleep’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp: In function ‘void* fifoThread(void*)’:
p_appmanager/src/appmanager_process.cpp:815:22: error: ‘fork’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:818:72: error: ‘execl’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:842:64: error: ‘execl’ was not declared in this scope
p_appmanager/src/appmanager_process.cpp:865:72: error: ‘execl’ was not declared in this scope
make: *** [all] Error 1

我的内核版本是“Linux amit-bhaira 3.8.0-26-generic＃38-Ubuntu SMP Mon Jun 17 21:46:08 UTC 2013 i686 i686 i686 GNU / Linux”。相同的代码在另一台Linux机器上运行。

请帮我解决这个问题。

感谢。

Answer 1

添加#include <unistd.h>

它可以在其他平台上运行，因为它们正在使用旧版本的gcc（＆lt; 4.7）进行编译，它在某些系统头文件中意外地包含了unistd.h。

Answer 2

来自fork(2)手册页：

SYNOPSIS
       #include <unistd.h>

来自exec(3)手册页：

SYNOPSIS
       #include <unistd.h>

来自getpid(2)手册页：

SYNOPSIS
       #include <sys/types.h>
       #include <unistd.h>

来自sleep(3)手册页：

SYNOPSIS
       #include <unistd.h>

Answer 3

您已忘记程序中的#include <unistd.h>。

编译时出错？

3 个答案: