更详细的内容见man page。这里举例说明:
nm -u hello.o
显示hello.o 中的未定义符号,需要和其他对象文件进行链接.
nm -A /usr/lib/*2>/dev/null | grep "T memset"
在 /usr/lib/ 目录下找出哪个库文件定义了memset函数.
[root@localhost memzone]# nm -n -C build/app/TestMalloc |grep rte_malloc
00000000005b1b54 T rte_malloc_socket
00000000005b1bfc T rte_malloc
00000000005b1d40 T rte_malloc_validate
00000000005b1dc0 T rte_malloc_get_socket_stats
00000000005b1e20 T rte_malloc_dump_stats
00000000005b1f48 T rte_malloc_set_limit
00000000005b1f60 T rte_malloc_virt2iova
00000000005b23f4 T rte_malloc_dump_heaps
00000000005b2464 T rte_malloc_heap_get_socket
00000000005b2584 T rte_malloc_heap_socket_is_external
00000000005b2638 T rte_malloc_heap_memory_add
00000000005b2838 T rte_malloc_heap_memory_remove
00000000005b29a8 T rte_malloc_heap_memory_attach
00000000005b29d8 T rte_malloc_heap_memory_detach
00000000005b2a08 T rte_malloc_heap_create
00000000005b2b94 T rte_malloc_heap_destroy
[root@localhost memzone]# ldd build/app/TestMalloc
linux-vdso.so.1 => (0x0000ffff88e20000)
librt.so.1 => /lib64/librt.so.1 (0x0000ffff88dd0000)
libm.so.6 => /lib64/libm.so.6 (0x0000ffff88d10000)
libnuma.so.1 => /lib64/libnuma.so.1 (0x0000ffff88ce0000)
libdl.so.2 => /lib64/libdl.so.2 (0x0000ffff88cb0000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x0000ffff88c70000)
libc.so.6 => /lib64/libc.so.6 (0x0000ffff88ae0000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000ffff88aa0000)
/lib/ld-linux-aarch64.so.1 (0x0000ffff88e30000)
[root@localhost memzone]# readelf -d build/app/TestMalloc
Dynamic section at offset 0x9efab0 contains 29entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [librt.so.1]
0x0000000000000001 (NEEDED) Shared library: [libm.so.6]
0x0000000000000001 (NEEDED) Shared library: [libnuma.so.1]
0x0000000000000001 (NEEDED) Shared library: [libdl.so.2]
0x0000000000000001 (NEEDED) Shared library: [libpthread.so.0]
0x0000000000000001 (NEEDED) Shared library: [libc.so.6]
0x000000000000000c (INIT) 0x463ce8
0x000000000000000d (FINI) 0xba6210
0x0000000000000019 (INIT_ARRAY) 0xdff400
0x000000000000001b (INIT_ARRAYSZ) 1696(bytes)
0x000000000000001a (FINI_ARRAY) 0xdffaa0
0x000000000000001c (FINI_ARRAYSZ) 8(bytes)
0x000000006ffffef5 (GNU_HASH) 0x4002d0
0x0000000000000005 (STRTAB) 0x436f08
0x0000000000000006 (SYMTAB) 0x40d250
0x000000000000000a (STRSZ) 163405(bytes)
0x000000000000000b (SYMENT) 24(bytes)
0x0000000000000015 (DEBUG) 0x0
0x0000000000000003 (PLTGOT) 0xdfffe8
0x0000000000000002 (PLTRELSZ) 5544(bytes)
0x0000000000000014(PLTREL) RELA
0x0000000000000017 (JMPREL) 0x462740
0x0000000000000007 (RELA) 0x4625c0
0x0000000000000008 (RELASZ) 384(bytes)
0x0000000000000009 (RELAENT) 24(bytes)
0x000000006ffffffe (VERNEED) 0x462510
0x000000006fffffff (VERNEEDNUM) 5
0x000000006ffffff0 (VERSYM) 0x45ed56
0x0000000000000000 (NULL) 0x0[root@localhost memzone]#
[root@localhost memzone]# nm -Au build/app/TestMalloc |grep rte_malloc
[root@localhost memzone]# nm -A build/app/TestMalloc |grep rte_malloc
build/app/TestMalloc:00000000005b1bfc T rte_malloc
build/app/TestMalloc:00000000005b23f4 T rte_malloc_dump_heaps
build/app/TestMalloc:00000000005b1e20 T rte_malloc_dump_stats
build/app/TestMalloc:00000000005b1dc0 T rte_malloc_get_socket_stats
build/app/TestMalloc:00000000005b2a08 T rte_malloc_heap_create
build/app/TestMalloc:00000000005b2b94 T rte_malloc_heap_destroy
build/app/TestMalloc:00000000005b2464 T rte_malloc_heap_get_socket
build/app/TestMalloc:00000000005b2638 T rte_malloc_heap_memory_add
build/app/TestMalloc:00000000005b29a8 T rte_malloc_heap_memory_attach
build/app/TestMalloc:00000000005b29d8 T rte_malloc_heap_memory_detach
build/app/TestMalloc:00000000005b2838 T rte_malloc_heap_memory_remove
build/app/TestMalloc:00000000005b2584 T rte_malloc_heap_socket_is_external
build/app/TestMalloc:00000000005b1f48 T rte_malloc_set_limit
build/app/TestMalloc:00000000005b1b54 T rte_malloc_socket
build/app/TestMalloc:00000000005b1d40 T rte_malloc_validate
build/app/TestMalloc:00000000005b1f60 T rte_malloc_virt2iova
[root@localhost memzone]# nm -u build/app/TestMalloc |grep rte_malloc
[root@localhost memzone]# nm -a build/app/TestMalloc |grep rte_malloc
00000000005b1bfc T rte_malloc
0000000000000000a rte_malloc.c
00000000005b23f4 T rte_malloc_dump_heaps
00000000005b1e20 T rte_malloc_dump_stats
00000000005b1dc0 T rte_malloc_get_socket_stats
00000000005b2a08 T rte_malloc_heap_create
00000000005b2b94 T rte_malloc_heap_destroy
00000000005b2464 T rte_malloc_heap_get_socket
00000000005b2638 T rte_malloc_heap_memory_add
00000000005b29a8 T rte_malloc_heap_memory_attach
00000000005b29d8 T rte_malloc_heap_memory_detach
00000000005b2838 T rte_malloc_heap_memory_remove
00000000005b2584 T rte_malloc_heap_socket_is_external
00000000005b1f48 T rte_malloc_set_limit
00000000005b1b54 T rte_malloc_socket
00000000005b1d40 T rte_malloc_validate
00000000005b1f60 T rte_malloc_virt2iova