Linux 编译时出错？
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Getting errors while compiling?
提问by Amit Bhaira
I am getting these errors when I am compiling my code. I have all the headers under user/include
我在编译代码时遇到这些错误。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
my kernel version is "Linux amit-bhaira 3.8.0-26-generic #38-Ubuntu SMP Mon Jun 17 21:46:08 UTC 2013 i686 i686 i686 GNU/Linux" . Same code is running on another linux machine.
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。
please help me to fix this problem.
请帮我解决这个问题。
Thanks.
谢谢。
采纳答案by Oliver Matthews
Add #include <unistd.h>
添加 #include <unistd.h>
It works on other platforms because they are compiling with an old version of gcc (<4.7) which accidentally included unistd.h in some system headers.
它适用于其他平台，因为它们正在使用旧版本的 gcc (<4.7) 进行编译，该版本意外地将 unistd.h 包含在某些系统头文件中。
回答by Mats Petersson
You have forgotten #include <unistd.h>in your program.
你已经忘记#include <unistd.h>了你的程序。
回答by Ignacio Vazquez-Abrams
From the fork(2)man page:
从fork(2)手册页：
SYNOPSIS
#include <unistd.h>
From the exec(3)man page:
从exec(3)手册页：
SYNOPSIS
#include <unistd.h>
From the getpid(2)man page:
从getpid(2)手册页：
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
From the sleep(3)man page:
从sleep(3)手册页：
SYNOPSIS
#include <unistd.h>
