(10%) 简述系统调用(System call)、系统程序(System program)的用途。相关知识点: 试题来源: 解析 参考答案:系统调用,允许用户进程请求操作系统提供的服务。由OS内核实现并提供访问接口,由用户程序调用,程序员使用。 系统程序,给用户提供基本的功能,这样用户在解决公共问题的时候不用写自己的程序。提供程序开发和执行...
Call system, and call program for systemPROBLEM TO BE SOLVED: To provide a call system from a terminal to a party having a terminal and a PSTN telephone connectable to a computer network without knowing the address of the call terminal of the party.宮川 潤一...
You’ll create a new trace system call that will control tracing. It should take one argument, an integer “mask”, whose bits specify which system calls to trace. For example, to trace the fork system call, a program calls trace(1 « SYS_fork), where SYS_fork is a syscall number ...
program abort 【计】 程序异常终止, 程序异常结束 unlink system call 【计】 解链系统调用 call wire system 【电】 传线系统 create system call 【计】 生成系统调用 system call interrupt 系统调用中断 call lost system 明显损失制 system call 系统调度,系统调用 seek system call 【计】 查找...
/kernel/exec.c...更新页表,内存等操作// Save program name for debugging.for(last=s=path;*s;s++)if(*s=='/')last=s+1;safestrcpy(p->name,last,sizeof(p->name));// Commit to the user image.oldpagetable=p->pagetable;p->pagetable=pagetable;p->sz=sz;p->trapframe->epc=elf.entr...
For example, to trace the fork system call, a program calls trace(1 << SYS_fork), where SYS_fork is a syscall number from kernel/syscall.h. You have to modify the xv6 kernel to print out a line when each system call is about to return, if the system call’s number is set in ...
forksystem call:create a new process to execute a new program in a new process :first a fork to create a new process, and then an exec to load a new binary into that process exec系列函数中,只有execve是系统调用,其余函数都是根据execve进行封装的C语言库函数 ...
Interruption of system calls and library functions by signal handlersIf a signal handler is invoked while a system call or library function call is blocked, then either: * the call is automatically restarted after the signal handler returns; or ...
System is a free, open, and living public resource that aims to explain how anything in the world is connected to everything else.
You'll create a new trace system call that will control tracing. It should take one argument, an integer "mask", whose bits specify which system calls to trace. For example, to trace the fork system call, a program calls trace(1 << SYS_fork), where SYS_fork is a syscall number ...