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Getting compilation errors?

I get these errors when I compile my code. I have all the headers under user / include

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-generi # 38-Ubuntu SMP Mon Jun 17 21:46:08 UTC 2013 i686 i686 i686 GNU / Linux". The same code runs on another Linux machine.

please help me solve this problem.

Thanks.

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3 answers

Add #include <unistd.h>

It works on other platforms because they compile with the old version of gcc (<4.7), which accidentally included unistd.h in some system headers.

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On the fork(2) man page:

 SYNOPSIS #include <unistd.h>

On the exec(3) man page:

 SYNOPSIS #include <unistd.h>

On the getpid(2) man page:

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

On the sleep(3) man page:

 SYNOPSIS #include <unistd.h>
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You forgot #include <unistd.h> in your program.

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Source: https://habr.com/ru/post/950197/

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