ermyth/src/linker.C

/*
 * linker.C: Abstraction of the dynamic linking system.
 * Rights to this code are documented in doc/pod/license.pod.
 *
 * Copyright © 2005-2007 Atheme Project (http://www.atheme.org)           
 */

static char const rcsid[] = "$Id";

#include "atheme.h"

#include <dlfcn.h>

#ifdef __OpenBSD__
# define RTLD_NOW RTLD_LAZY
#endif

#ifndef __HPUX__
# define PLATFORM_SUFFIX ".so"
#else
# define PLATFORM_SUFFIX ".sl"
#endif

/*
 * linker_open()
 *
 * Inputs:
 *       path to file to open
 *
 * Outputs:
 *       linker handle.
 *
 * Side Effects:
 *       a shared module is loaded into the application's memory space
 */
void *
linker_open (char *path)
{
  return dlopen (path, RTLD_NOW);
}

/*
 * linker_open_ext()
 *
 * Inputs:
 *       path to file to open
 *
 * Outputs:
 *       linker handle
 *
 * Side Effects:
 *       the extension is appended if it's not already there.
 *       a shared module is loaded into the application's memory space
 */
void *
linker_open_ext (char *path)
{
  void *handle;
  char *buf = static_cast<char *> (smalloc (strlen (path) + 20));

  strlcpy (buf, path, strlen (path) + 20);

  if (!strstr (buf, PLATFORM_SUFFIX))
    strlcat (buf, PLATFORM_SUFFIX, strlen (path) + 20);

  handle = linker_open (buf);
  free (buf);

  return handle;
}

/*
 * linker_getsym()
 *
 * Inputs:
 *       linker handle, symbol to retrieve
 *
 * Outputs:
 *       pointer to symbol, or NULL if no symbol.
 *
 * Side Effects:
 *       none
 */
void *
linker_getsym (void *vptr, char *sym)
{
  return dlsym (vptr, sym);
}

/*
 * linker_close()
 *
 * Inputs:
 *       linker handle
 *
 * Outputs:
 *       none
 *
 * Side Effects:
 *       the module is unloaded from the linker
 */
void
linker_close (void *vptr)
{
  dlclose (vptr);
}
Revision:	1.2
Committed:	Sat Jul 21 01:29:12 2007 UTC (19 years, 1 month ago) by pippijn
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+1 -1 lines
Log Message:	- moved to new documentation system - fixed small build error
#	User	Rev	Content
1	pippijn	1.1	/*
2			* linker.C: Abstraction of the dynamic linking system.
3	pippijn	1.2	* Rights to this code are documented in doc/pod/license.pod.
4	pippijn	1.1	*
5			* Copyright © 2005-2007 Atheme Project (http://www.atheme.org)
6			*/
7
8			static char const rcsid[] = "$Id";
9
10			#include "atheme.h"
11
12			#include <dlfcn.h>
13
14			#ifdef __OpenBSD__
15			# define RTLD_NOW RTLD_LAZY
16			#endif
17
18			#ifndef __HPUX__
19			# define PLATFORM_SUFFIX ".so"
20			#else
21			# define PLATFORM_SUFFIX ".sl"
22			#endif
23
24			/*
25			* linker_open()
26			*
27			* Inputs:
28			* path to file to open
29			*
30			* Outputs:
31			* linker handle.
32			*
33			* Side Effects:
34			* a shared module is loaded into the application's memory space
35			*/
36			void *
37			linker_open (char *path)
38			{
39			return dlopen (path, RTLD_NOW);
40			}
41
42			/*
43			* linker_open_ext()
44			*
45			* Inputs:
46			* path to file to open
47			*
48			* Outputs:
49			* linker handle
50			*
51			* Side Effects:
52			* the extension is appended if it's not already there.
53			* a shared module is loaded into the application's memory space
54			*/
55			void *
56			linker_open_ext (char *path)
57			{
58			void *handle;
59			char buf = static_cast<char > (smalloc (strlen (path) + 20));
60
61			strlcpy (buf, path, strlen (path) + 20);
62
63			if (!strstr (buf, PLATFORM_SUFFIX))
64			strlcat (buf, PLATFORM_SUFFIX, strlen (path) + 20);
65
66			handle = linker_open (buf);
67			free (buf);
68
69			return handle;
70			}
71
72			/*
73			* linker_getsym()
74			*
75			* Inputs:
76			* linker handle, symbol to retrieve
77			*
78			* Outputs:
79			* pointer to symbol, or NULL if no symbol.
80			*
81			* Side Effects:
82			* none
83			*/
84			void *
85			linker_getsym (void vptr, char sym)
86			{
87			return dlsym (vptr, sym);
88			}
89
90			/*
91			* linker_close()
92			*
93			* Inputs:
94			* linker handle
95			*
96			* Outputs:
97			* none
98			*
99			* Side Effects:
100			* the module is unloaded from the linker
101			*/
102			void
103			linker_close (void *vptr)
104			{
105			dlclose (vptr);
106			}