编译时出错？

我在编译我的代码时遇到这些错误。我都下用户头/包括编译时出错？

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的阿米特 - bhaira 3.8.0-26泛型＃38，Ubuntu的SMP周一6月17日21时46分08秒UTC 2013 i686的的i686 i686的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。

谢谢。

来源

2013-07-24 Amit Bhaira

是您的代码，包括？ –

你是否诚实地相信我们可以神奇地解决你的编译器错误而不看代码？ – 2013-07-24 14:31:23

@ H2CO3：对于*那些*特定的，是的。 –

添加#include <unistd.h>

它适用于其他平台，因为它们与旧版本，在某些系统头不小心unistd.h中包括GCC（< 4.7）的编制。

来源

2013-07-24 14:36:28

您忘记了您的程序中的#include <unistd.h>。

来源

2013-07-24 14:30:59

不，我没有，我已经提到相同的代码在另一台Linux机器上运行。 –

它可能被其他头文件吸引 - 这确实发生。由于你的代码有意使用诸如'fork'和'execl'之类的东西，你应该自己包含它，而不要依赖它被间接包含。 –

从fork(2)手册页：

SYNOPSIS 
     #include <unistd.h>

从exec(3)手册页：

SYNOPSIS 
     #include <unistd.h>

从getpid(2)手册页：

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

从sleep(3)手册页：

SYNOPSIS 
     #include <unistd.h>

来源

2013-07-24 14:31:15

编译时出错？

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