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GojaN

Member

Registered: 2007-11-09

Posts: 13

alpm in my code

Hi all!

I download the pacman tarball and try to use it in a simple program, only for test.
The program looks like:

#include <alpm.h>

main(){
   alpm_init()
   alpm_del()
}

The problem is that isn't compile. It's say something about yo use "__atribute__" in the headers files, more specific about the return type of functions.

I try to use -fvisibility=(default|hidden|internal) but it's doesn't work. I also try to use #pragma GCC visibility push(default) bout the same result.

How can I use this lib?

shining

Pacman Developer

Registered: 2006-05-10

Posts: 2,043

Re: alpm in my code

Here is a little example taken from another thread :
http://bbs.archlinux.org/viewtopic.php? … 77#p275277

/*
 *  displaypkg.c : Display the locally installed packages sorted by size.
 *
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>

#include <alpm.h>
#include <alpm_list.h>

int pkg_cmp(const void *v1, const void *v2)
{
  pmpkg_t *p1 = (pmpkg_t *)v1;
  pmpkg_t *p2 = (pmpkg_t *)v2;
  unsigned long int s1 = alpm_pkg_get_size(p1);
  unsigned long int s2 = alpm_pkg_get_size(p2);
  return(s2 - s1);
}

int main(int argc, char **argv)
{
  pmdb_t *db = NULL;
  alpm_list_t *i;

  if(alpm_initialize() == -1) {
    fprintf(stderr, "cannot initialize alpm: %s\n", alpm_strerror(pm_errno));
    exit(EXIT_FAILURE);
  }

  /* let us get log messages from libalpm */
  alpm_option_set_dbpath("/var/lib/pacman");

  db = alpm_db_register_local();
  if(db == NULL) {
    fprintf(stderr, "error: could not register 'local' database (%s)\n",
        alpm_strerror(pm_errno));
    exit(EXIT_FAILURE);
  }

  alpm_list_t *list = alpm_db_getpkgcache(db);
  list = alpm_list_msort(list, alpm_list_count(list), pkg_cmp);

  for(i = list; i; i = alpm_list_next(i)) {
    pmpkg_t *pkg = alpm_list_getdata(i);
    printf("%s %lu\n", alpm_pkg_get_name(pkg), alpm_pkg_get_size(pkg)/1024);
  }

  if(alpm_release() == -1) {
    fprintf(stderr, "error releasing alpm: %s\n", alpm_strerror(pm_errno));
  }

  exit(EXIT_SUCCESS);
}

compile :
$ gcc displaypkg.c -o displaypkg -lalpm -Wall
run :
$ ./displaypkg | column -t

There are also three other similar little tools in src/util : testdb, testpkg and vercmp.

Last edited by shining (2008-01-22 13:18:12)

---

pacman roulette : pacman -S $(pacman -Slq | LANG=C sort -R | head -n $((RANDOM % 10)))

GojaN

Member

Registered: 2007-11-09

Posts: 13

Re: alpm in my code

Cul!!!

Very Thanks!!