Linux中程序执行的步骤分析工具——strace
发布时间：2021-12-13 11:09:15 所属栏目：教程 来源：互联网
导读：Linux中程序执行的流程分析工具strace 源代码： #include stdio.h main() { char a=A; int b=20; printf(%d,%on,(a=a+a,a+b,b),a+a-A,b); } 使用strace运行: [arm@acer test]$ ./prin 20,141 [arm@acer test]$ strace ./prin execve(./prin, [./prin], [/* 4
|
Linux中程序执行的流程分析工具——strace 源代码： #include <stdio.h> main() { char a='A'; int b=20; printf("%d,%on",(a=a+a,a+b,b),a+'a'-'A',b); } 使用strace运行: [arm@acer test]$ ./prin 20,141 [arm@acer test]$ strace ./prin execve("./prin", ["./prin"], [/* 48 vars */]) = 0 brk(0) = 0x9b6a000 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb772e000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=102258, ...}) = 0 mmap2(NULL, 102258, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7715000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "177ELF1113 3 3 1 @^c 004 "..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1906124, ...}) = 0 mmap2(0x61f000, 1665416, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x61f000 mprotect(0x7af000, 4096, PROT_NONE) = 0 mmap2(0x7b0000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x190) = 0x7b0000 mmap2(0x7b3000, 10632, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7b3000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7714000 set_thread_area({entry_number:-1 -> 6, base_addr:0xb77146c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 mprotect(0x7b0000, 8192, PROT_READ) = 0 mprotect(0x617000, 4096, PROT_READ) = 0 munmap(0xb7715000, 102258) = 0 fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb772d000 write(1, "20,141n", 720,141 ) = 7 exit_group(7) = ? 可以看到程序首先使用系统调用execve()函数，使用brk()函数设置创建进程段。brk()系统调用很重要，该系统调用创建存放程序内容的内存区域。 打开共享库文件，并加载到内存。  （编辑：PHP编程网 - 黄冈站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
浙公网安备 33038102330482号