Mac OS X 上的ldd和strace的替代

Linux下经常会用到ldd查看程序使用了哪些共享链接库，很方便的一个工具，在Mac OS X上没有这个命令，如果想在Mac OS X查看程序使用了哪些链接库可以用otool 来代替。

例：

$ otool -L /usr/bin/vim /usr/bin/vim:       /usr/lib/libncurses.5.4.dylib (compatibility version 5.4.0, current version 5.4.0)       /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)       /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)

otool还有很多其它参数：

-f print the fat headers-a print the archive header-h print the mach header-l print the load commands-L print shared libraries used-D print shared library id name-t print the text section (disassemble with -v)-p <routine name> start dissassemble from routine name-s <segname> <sectname> print contents of section-d print the data section-o print the Objective-C segment-r print the relocation entries-S print the table of contents of a library-T print the table of contents of a dynamic shared library-M print the module table of a dynamic shared library-R print the reference table of a dynamic shared library-I print the indirect symbol table-H print the two-level hints table-G print the data in code table-v print verbosely (symbolically) when possible-V print disassembled operands symbolically-c print argument strings of a core file-X print no leading addresses or headers-m don’t use archive(member) syntax-B force Thumb disassembly (ARM objects only)-q use llvm’s disassembler (the default)-Q use otool(1)’s disassembler-mcpu=arg use `arg’ as the cpu for disassembly-j print opcode bytes-C print linker optimization hints–version print the version of otool

详细使用请参看手册。

Linux中的strace可以查看程序运行时的系统调用，有时对于调试程序很有帮助，Mac OS X中可用dtruss (需要root)替代

例：

sudo dtruss df -h

其它参数：

-p PID # examine this PID-n name # examine this process name-t syscall # examine this syscall only-a # print all details-c # print syscall counts-d # print relative times (us)-e # print elapsed times (us)-f # follow children-l # force printing pid/lwpid-o # print on cpu times-s # print stack backtraces-L # don’t print pid/lwpid-b bufsize # dynamic variable buf sizeeg,dtruss df -h # run and examine “df -h”dtruss -p 1871 # examine PID 1871dtruss -n tar # examine all processes called “tar”dtruss -f test.sh # run test.sh and follow children