feat: add strace test

tests/cpu/index.md

@@ -3,4 +3,5 @@
 - [容器 cpu 系统利用率的计算过程](tests/cpu/test07)
 - [直接使用perf_event_open获取硬件计数](tests/cpu/test08)
 - [火焰图专用测试代码](tests/cpu/test09)
-- [C语言调用Golang函数原理](tests/cpu/test10)
+- [C语言调用Golang函数原理](tests/cpu/test10)
+- [模拟 strace 命令捕获其它进程系统调用](tests/cpu/test11)

tests/cpu/test11/main.c

@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ptrace.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/reg.h>
+
+void handle_syscall(pid_t pid) {
+	long syscall_number;
+	char *syscall_name = NULL;
+
+	// 读取系统调用号
+	syscall_number = ptrace(PTRACE_PEEKUSER, pid, 8 * ORIG_RAX, NULL);  // 8 * ORIG_RAX 是 x86_64 架构下系统调用号的寄存器位置
+
+	// 根据系统调用号获取系统调用名称
+	switch (syscall_number) {
+		case 5: syscall_name = "read"; break;
+		case 6: syscall_name = "write"; break;
+		case 10: syscall_name = "open"; break;
+		case 11: syscall_name = "close"; break;
+		// 添加更多系统调用号和名称的映射
+		default: syscall_name = "unknown"; break;
+	}
+
+	printf("Syscall: %s (number: %ld)\n", syscall_name, syscall_number);
+
+	
+}
+
+int main(int argc, char *argv[]) {
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <PID>\n", argv[0]);
+		exit(1);
+	}
+
+	pid_t pid = atoi(argv[1]);
+
+	int status;
+
+	if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) == -1) {
+		perror("PTRACE_ATTACH");
+		exit(1);
+	}
+
+	if (waitpid(pid, &status, 0) == -1) {
+		perror("waitpid");
+		exit(1);
+	}
+
+	if (!WIFSTOPPED(status)) {
+		fprintf(stderr, "Process did not stop\n");
+		exit(1);
+	}
+
+	printf("Attached to process %d\n", pid);
+
+	while (1) {
+		if (ptrace(PTRACE_SYSCALL, pid, NULL, NULL) == -1) {
+			perror("PTRACE_SYSCALL");
+			exit(1);
+		}
+
+		if (waitpid(pid, &status, 0) == -1) {
+			perror("waitpid");
+			exit(1);
+		}
+
+		if (WIFEXITED(status)) {
+			printf("Process exited\n");
+			break;
+		}
+
+		if (WIFSTOPPED(status)) {
+			handle_syscall(pid);
+		}
+	}
+
+	if (ptrace(PTRACE_DETACH, pid, NULL, NULL) == -1) {
+		perror("PTRACE_DETACH");
+		exit(1);
+	}
+
+	printf("Detached from process %d\n", pid);
+
+	return 0;
+}