在编写一些用C++打印回溯的代码时,我遇到了,它包括复制类型的定义:
/* This structure mirrors the one found in /usr/include/asm/ucontext.h */
typedef struct _sig_ucontext {
unsigned long uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
struct sigcontext uc_mcontext;
sigset_t uc_sigmask;
} sig_ucon
使用gcc,我在编译一些使用ucontext.h的东西时会得到这些错误。
/usr/include/sys/ucontext.h: At top level:
/usr/include/sys/ucontext.h:138: error: expected identifier or ‘(’ before numeric constant
/usr/include/sys/ucontext.h:139: error: expected ‘;’ before ‘stack_t’
看看ucontext.h,这似乎就是导致:
134 /* Userlevel cont
int swapcontext(ucontext_t *oucp, ucontext_t *ucp);
int getcontext(ucontext_t *ucp);
int setcontext(const ucontext_t *ucp);
如果我的理解是正确的,那么swapcontext相当于先在oucp上调用getcontext,然后在ucp上调用setcontext。我正在尝试如何使用getcontext和setcontext实现swapcontext。
int swapcontext(ucontext_t *oucp, ucontext_t *ucp)
{
get
我刚刚把我的程序上传到github:
你可以克隆它并在你的Mac电脑上运行。很方便。当我在根文件夹中运行make时,它显示:
uthread.c:21:3: warning: implicit declaration of function ‘swapcontext’ [-Wimplicit-function-declaration]
swapcontext(¤tThread->context,&scheduler_context);
^
uthread.c: In function ‘main_manager’:
uthread.c:31:2:
在sigaction(2)手册页中:
The siginfo_t argument to a SA_SIGINFO handler
When the SA_SIGINFO flag is specified in act.sa_flags, the signal
handler address is passed via the act.sa_sigaction field. This han‐
dler takes three arguments, as follows:
void
handler(int sig, siginfo_t *in
当包含Linux头文件时,在我的C程序的Visual Studio2017上的Linux C++项目中,它不能识别头文件。即使我包含sys/ucontext.h,它也不能识别我应该能够用于ucontext_t对象的函数,比如。我不应该在Linux C++项目中使用这些函数吗?
我正在编写的代码:
#include <stddef.h>
#include <string.h>
#include <sys/ucontext.h>
// If I use ucontext.h instead, it gives the error: cannot open so
我需要从一开始就初始化一个对象,并在整个特定页面中使用这些对象,我该怎么做呢?
//待初始化的Block
XTContext.UserContext UContext = new XTContext.UserContext();
XTContext.Context ctxt = new XTContext.Context();
XTErrorCollection.ErrorCollection eContext = new XTErrorCollection.ErrorCollection();
c
我为分段故障安装了自定义信号处理程序。
void sa_sigHandler(int signo, siginfo_t *info, void *context) {
...
void *variableAddr = info->si_addr;
ucontext_t *uctx = (ucontext_t *)context;
unsigned long inst = uctx->uc_mcontext.gregs[REG_RIP];
// how to get file, source line and object name here ?
..
以下步骤:
$ wget http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/gc-7.0.tar.gz
$ tar xvfz gc-7.0.tar.gz
$ cd gc-7.0
$ ./configure
$ make
失败,并显示此错误:
In file included from mach_dep.c:163:
/usr/include/ucontext.h:42:2: error: #error ucontext routines are deprecated,
and require _XOPEN_SOURCE to be
我不能再在前一天推送的ruby:2.7.4-alpine3.13镜像上安装Rubygems byebug和racc了。似乎有什么东西被移除或移动了。 复制: docker pull ruby:2.7.4-alpine3.13
2.7.4-alpine3.13: Pulling from library/ruby
Digest: sha256:89b589e1b6b334ed7af93da3d4c75dca5beef8f1a844594c3a865bc6c4f5b96e
Status: Image is up to date for ruby:2.7.4-alpine3.13
docker
我试图使用C中的上下文切换创建一个自定义的线程库。我在调用setcontext()时遇到了获取分段错误的问题--关于这个函数的文档似乎有限,所以我无法真正弄清楚发生了什么,而且已经花费了大量的停机时间。我的代码:
#include <signal.h>
#include <ucontext.h>
struct mypthread_t{
int id;
int pid;
int isRunning;
mypthread_t *next;
ucontext_t* context;
};
int mypthread_create(mypth