https://github.com/ccmorataya/sistemasoperativos

Static and dynamic libraries with C for the course of "Sistemas Operativos I"
https://github.com/ccmorataya/sistemasoperativos

Last synced: 15 days ago
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Static and dynamic libraries with C for the course of "Sistemas Operativos I"

• Host: GitHub
• URL: https://github.com/ccmorataya/sistemasoperativos
• Owner: ccmorataya
• Created: 2016-09-05T16:50:53.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2016-09-05T22:41:12.000Z (over 8 years ago)
• Last Synced: 2024-11-07T03:38:00.972Z (2 months ago)
• Language: C
• Homepage:
• Size: 2.93 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Static and Shared libraries in Linux

## Static libraries: 

Files used:

`libreria.c`

`libreria.h`

`consume.c`

How to compile:

```

$ gcc -c  -o 

$ ar rcs lib.a 

```

Linking the static library:

`$ gcc -static consume.c -L. -llibreria`

## Dynamic (Shared) libraries:

How to compile:

```

$ gcc -c -fPIC libreria.c -o libreria.o

$ gcc -shared -o liblibreria.so libreria.o

```

Linking the dynamic library:

`$ gcc consume.c -o dynamically_linked -L. -llibreria`

At this point if we execute the binary with:

`$ ./dynamically_linked`

We receive the following error:

`$ ./dynamically_linked: error while loading shared libraries: liblibreria.so: cannot open shared object file: No such file or directory`

To solve that is necesary to add a variable to the path, the LD_LIBRARY_PATH with two simple comands:

```

$ LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH

$ export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH

```

And that's all to do, now simple execute the bin as follow:

`$ ./dynamically_linked`