我在编译我的代码时遇到这些错误。 我有用户/包括所有标题
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。
谢谢。
添加#include <unistd.h>
它在其他平台上工作，因为它们正在编译一个旧版本的gcc（<4.7），它意外地在一些系统头文件中包含了unistd.h。
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>
你忘记了程序中的#include <unistd.h> 。