The downside is, that any command you use to access ${PIPESTATUS[]}, will automatically replace the current state of the array with the return code of the command you have just run: So as soon as we use echo to tell us about the return code of grep, the ${PIPESTATUS[]} array now ...
Linux grep return code The exit code is 1 because nothing was matched by grep. EXIT STATUS The exit status is 0 if selected lines are found, and 1 if not found. If an error occurred the exit status is 2. (Note: POSIX error handling code should check for '2' or greater.) The outp...
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voidmyhandler(int signum){cout<<"process get a signal: "<<signum<<endl;}intmain(){for(int i=1;i<=31;i++){signal(i,myhandler);}while(true){cout<<"i am a process, pid: "<<getpid()<<endl;sleep(1);}return0;} 最终经过实验我们得出在1~31号信号中只有9号和19号信号不能被捕捉,...
* wait4()-ing process will get the correct exit code - even if this * thread is not the thread group leader. */SYSCALL_DEFINE1(exit_group,int,error_code){do_group_exit((error_code&0xff)<<8);/* NOTREACHED */return0;} do_exit_group流程 ...
/*初始化串口通信设置*/|-->console_init_f(common/console.c) /*初始化控制台*/|-->...|-->relocate_code(arch/arm/lib/relocate.S) /*主要完成镜像拷贝和重定位*/|-->relocate_vectors(arch/arm/lib/relocate.S)/*重定位向量表*/|-->board_init_r(common/board_r.c)/*板级初始化*/|-->in...
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si_code = SI_USER; info.si_pid = current->pid; info.si_uid = current->uid; return kill_something_info(sig, &info, pid); } sys_kill() 的代码比较简单,首先初始化 info 变量的成员,接着调用 kill_something_info() 函数来处理发送信号的操作。kill_something_info() 函数的代码如下: static...
HiCarGetPinCode Function int32_t HiCarGetPinCode(uint8_t *pinCode, uint32_t maxLen) 获取PIN码。厂……欲了解更多信息欢迎访问华为HarmonyOS开发者官网
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