編譯時出錯？

我在編譯我的代碼時遇到這些錯誤。我都下用戶頭/包括編譯時出錯？

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

我的內核版本是「Linux的阿米特 - bhaira 3.8.0-26泛型＃38，Ubuntu的SMP週一6月17日21時46分08秒UTC 2013 i686的的i686 i686的GNU/Linux「。相同的代碼在另一臺linux機器上運行。

請幫我解決這個問題。

謝謝。

來源

2013-07-24 Amit Bhaira

是您的代碼，包括？ –

你是否誠實地相信我們可以神奇地解決你的編譯器錯誤而不看代碼？ – 2013-07-24 14:31:23

@ H2CO3：對於*那些*特定的，是的。 –

添加#include <unistd.h>

它適用於其他平臺，因爲它們與舊版本，在某些系統頭不小心unistd.h中包括GCC（< 4.7）的編制。

來源

2013-07-24 14:36:28

您忘記了您的程序中的#include <unistd.h>。

來源

2013-07-24 14:30:59

不，我沒有，我已經提到相同的代碼在另一臺Linux機器上運行。 –

它可能被其他頭文件吸引 - 這確實發生。由於你的代碼有意使用諸如'fork'和'execl'之類的東西，你應該自己包含它，而不要依賴它被間接包含。 –

從fork(2)手冊頁：

SYNOPSIS 
     #include <unistd.h>

從exec(3)手冊頁：

SYNOPSIS 
     #include <unistd.h>

從getpid(2)手冊頁：

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

從sleep(3)手冊頁：

SYNOPSIS 
     #include <unistd.h>

來源

2013-07-24 14:31:15

編譯時出錯？

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