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[shidongxue@centossvr testtool]$ vi a.c#include 
   
    int test2(int argc,char** argv){    printf("argc=%d, argv[0]=%s\n",argc,argv[0]);    return 0;}int main(int argc,char** argv){    printf("%p\n",argv);    printf("sizeof argv=%d\n",sizeof(argv));    return test2(argc,argv);}~~~~~~~~~~~~~~~~~"a.c" 13L, 239C 已写入[shidongxue@centossvr testtool]$ gcc a.c[shidongxue@centossvr testtool]$ gcc a.c -g[shidongxue@centossvr testtool]$ gdbGNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7Copyright (C) 2013 Free Software Foundation, Inc.License GPLv3+: GNU GPL version 3 or later 
    
     This is free software: you are free to change and redistribute it.There is NO WARRANTY, to the extent permitted by law.  Type "show copying"and "show warranty" for details.This GDB was configured as "x86_64-redhat-linux-gnu".For bug reporting instructions, please see:
     .(gdb) file a.outReading symbols from /home/shidongxue/work/testtool/a.out...done.(gdb) b mainBreakpoint 1 at 0x400570: file a.c, line 9.(gdb) r xStarting program: /home/shidongxue/work/testtool/a.out xBreakpoint 1, main (argc=2, argv=0x7fffffffe4a8) at a.c:99               printf("%p\n",argv);Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.8.x86_64 glibc-2.17-157.el7_3.2.x86_64(gdb) s0x7fffffffe4a810              printf("sizeof argv=%d\n",sizeof(argv));(gdb) ssizeof argv=811              return test2(argc,argv);(gdb) x/16c 0x7fffffffe4a80x7fffffffe4a8: -12 '\364'      -26 '\346'      -1 '\377'       -1 '\377'       -1 '\377'       127 '\177'   0 '\000'        0 '\000'0x7fffffffe4b0: 25 '\031'       -25 '\347'      -1 '\377'       -1 '\377'       -1 '\377'       127 '\177'   0 '\000'        0 '\000'(gdb) x/16x 0x7fffffffe4a80x7fffffffe4a8: 0xf4    0xe6    0xff    0xff    0xff    0x7f    0x00    0x000x7fffffffe4b0: 0x19    0xe7    0xff    0xff    0xff    0x7f    0x00    0x00(gdb) x/32c 0x7fffffffe6f40x7fffffffe6f4: 47 '/'  104 'h' 111 'o' 109 'm' 101 'e' 47 '/'  115 's' 104 'h'0x7fffffffe6fc: 105 'i' 100 'd' 111 'o' 110 'n' 103 'g' 120 'x' 117 'u' 101 'e'0x7fffffffe704: 47 '/'  119 'w' 111 'o' 114 'r' 107 'k' 47 '/'  116 't' 101 'e'0x7fffffffe70c: 115 's' 116 't' 116 't' 111 'o' 111 'o' 108 'l' 47 '/'  97 'a'(gdb) x/32c 0x7fffffffe7190x7fffffffe719: 120 'x' 0 '\000'        88 'X'  68 'D'  71 'G'  95 '_'  83 'S'  69 'E'0x7fffffffe721: 83 'S'  83 'S'  73 'I'  79 'O'  78 'N'  95 '_'  73 'I'  68 'D'0x7fffffffe729: 61 '='  50 '2'  55 '7'  57 '9'  54 '6'  0 '\000'        72 'H'  79 'O'0x7fffffffe731: 83 'S'  84 'T'  78 'N'  65 'A'  77 'M'  69 'E'  61 '='  99 'c'(gdb) x/1c 0x7fffffffe7190x7fffffffe719: 120 'x'
    
   

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