编译时出现错误

Getting errors while compiling?

本文关键字：错误 编译      更新时间：2023-10-16

我在编译代码时遇到了这些错误。我有用户/包含下的所有标题

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 GNU/Linux"。相同的代码正在另一台linux机器上运行。

请帮我解决这个问题。

谢谢。

添加#include <unistd.h>

它适用于其他平台，因为它们使用旧版本的gcc（<4.7）进行编译，该版本意外地在一些系统头中包含了unistd.h。

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>

您在程序中忘记了#include <unistd.h>。

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