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2025-01-31 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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Today, I will talk to you about how to use dynamic link libraries in the Linux system. Many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.
Compared with ordinary programs, dynamic link library has no main function, so it is the implementation of a series of functions. So dynamic link library files are produced through shared and fPIC compilation parameters. When the program calls the library function, it only needs to connect to the library. For example, the following implementation of a simple integer four transport dynamic link library, the definition of caculate.h and caculate.c two files, production libcac.so dynamic link library.
Commands useful for binaries
View file types
File
See which libraries the binaries are linked to
Ldd
Look at the symbol,T contained in the binary file for loading, and U for undefined symbol
Nm
Read the information in the binary file
Readelf-a smu.o
Convert binaries to assembly
Objdump-d sum.o
Generation of dynamic Link Library
Sum.c
# include # include int sum (int x) {int I, result=0; for (iFO; I 100) exit (- 1); return result;}; void display (char* msg) {printf ("% s\ n", msg);} int add (float a dint float b) {return aplanb;} int sum_array (int array [], int num) {int ionomy 0, sum = 0; for (iLife0; I)
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