# 打印进程内存信息 ## 技巧 用gdb调试程序时，如果想查看进程的内存映射信息，可以使用“i proc mappings”命令（i是info命令缩写），例如: (gdb) i proc mappings process 27676 flags: PR_STOPPED Process (LWP) is stopped PR_ISTOP Stopped on an event of interest PR_RLC Run-on-last-close is in effect PR_MSACCT Microstate accounting enabled PR_PCOMPAT Micro-state accounting inherited on fork PR_FAULTED : Incurred a traced hardware fault FLTBPT: Breakpoint trap Mapped address spaces: Start Addr End Addr Size Offset Flags 0x8046000 0x8047fff 0x2000 0xfffff000 -s--rwx 0x8050000 0x8050fff 0x1000 0 ----r-x 0x8060000 0x8060fff 0x1000 0 ----rwx 0xfee40000 0xfef4efff 0x10f000 0 ----r-x 0xfef50000 0xfef55fff 0x6000 0 ----rwx 0xfef5f000 0xfef66fff 0x8000 0x10f000 ----rwx 0xfef67000 0xfef68fff 0x2000 0 ----rwx 0xfef70000 0xfef70fff 0x1000 0 ----rwx 0xfef80000 0xfef80fff 0x1000 0 ---sr-- 0xfef90000 0xfef90fff 0x1000 0 ----rw- 0xfefa0000 0xfefa0fff 0x1000 0 ----rw- 0xfefb0000 0xfefb0fff 0x1000 0 ----rwx 0xfefc0000 0xfefeafff 0x2b000 0 ----r-x 0xfeff0000 0xfeff0fff 0x1000 0 ----rwx 0xfeffb000 0xfeffcfff 0x2000 0x2b000 ----rwx 0xfeffd000 0xfeffdfff 0x1000 0 ----rwx 首先输出了进程的flags，接着是进程的内存映射信息。 参见[gdb手册](https://sourceware.org/gdb/onlinedocs/gdb/SVR4-Process-Information.html#index-info-proc-exe). 此外，也可以用"i files"（还有一个同样作用的命令：“i target”）命令，它可以更详细地输出进程的内存信息，包括引用的动态链接库等等，例如： (gdb) i files Symbols from "/data1/nan/a". Unix /proc child process: Using the running image of child Thread 1 (LWP 1) via /proc. While running this, GDB does not access memory from... Local exec file: `/data1/nan/a', file type elf32-i386-sol2. Entry point: 0x8050950 0x080500f4 - 0x08050105 is .interp 0x08050108 - 0x08050114 is .eh_frame_hdr 0x08050114 - 0x08050218 is .hash 0x08050218 - 0x08050418 is .dynsym 0x08050418 - 0x080507e6 is .dynstr 0x080507e8 - 0x08050818 is .SUNW_version 0x08050818 - 0x08050858 is .SUNW_versym 0x08050858 - 0x08050890 is .SUNW_reloc 0x08050890 - 0x080508c8 is .rel.plt 0x080508c8 - 0x08050948 is .plt ...... 0xfef5fb58 - 0xfef5fc48 is .dynamic in /usr/lib/libc.so.1 0xfef5fc80 - 0xfef650e2 is .data in /usr/lib/libc.so.1 0xfef650e2 - 0xfef650e2 is .bssf in /usr/lib/libc.so.1 0xfef650e8 - 0xfef65be0 is .picdata in /usr/lib/libc.so.1 0xfef65be0 - 0xfef666a7 is .data1 in /usr/lib/libc.so.1 0xfef666a8 - 0xfef680dc is .bss in /usr/lib/libc.so.1 参见[gdb手册](https://sourceware.org/gdb/onlinedocs/gdb/Files.html) ## 贡献者 nanxiao