004
25.04.2003, 10:42 Uhr
virtual
Sexiest Bit alive
(Operator)
|
Man muß sich offenbar ein wenig auf die Hinterbeine Stellen. So hat es vom Prinzip by mir geklappt:
Das hier ist meine Share Lib:
| C++: |
/* myso.c */
#include <stdio.h>
void func()
{
FILE* log = fopen("myso.log", "a");
if (NULL != log) fprintf(log, "func called\n");
fclose(log);
}
void [b]my_init[/b]()
{
FILE* log = fopen("myso.log", "a");
if (NULL != log) fprintf(log, "_init called\n");
fclose(log);
}
void [b]my_fini[/b]()
{
FILE* log = fopen("myso.log", "a");
if (NULL != log) fprintf(log, "_fini called\n");
fclose(log);
}
|
Nun muß ich dem Linker nur noch mitteilen, daß my_init und my_fini die Routinen sind, die die Rolle von _init und _fini übernehmen sollen:
| C++: |
# makefile
libmyso.so : myso.o
gcc -fpic -shared [b]-Xlinker -init -Xlinker my_init -Xlinker -fini -Xlinker my_fini[/b] -o libmyso.so myso.o
myso.o : myso.c
gcc -fpic -shared -c -o myso.o myso.c
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P.S.: Nachgeprüft mit dieem Programm:
| C++: |
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int main(
int argc,
char** argv)
{
const char* prgname;
const char* libname;
const char* symbolname;
void* libhandle;
void* symbolhandle;
int mode = RTLD_LAZY;
int ret;
/*
* Determine invokation name
*/
prgname = argv[0] + strlen(argv[0]);
while (prgname>argv[0] && prgname[-1]!='/') prgname--;
/*
* Check arguments
*/
argv++; argc--;
while (argc)
{
if (strcmp(*argv, "--")==0)
{
argv++; argc--;
break;
}else if (**argv != '-')
{
break;
}else
{
if (strcmp(*argv, "-l") == 0 ||
strcmp(*argv, "--lazy") == 0)
{
mode = RTLD_LAZY;
argv++; argc--;
}else if (strcmp(*argv, "-n") == 0 ||
strcmp(*argv, "--now") == 0)
{
mode = RTLD_NOW;
argv++; argc--;
}else
{
fprintf(stderr, "*** ERROR: %s: unknown option %s\n"
"usage: %s [-l|-n] library symbol\n",
prgname, *argv, prgname);
exit(EXIT_FAILURE);
}
}
}
if (argc != 2)
{
fprintf(stderr, "*** ERROR: %s: missing arguments\n"
"usage: %s [-l|-n] library symbol\n",
prgname, prgname);
exit(EXIT_FAILURE);
}
libname = argv[0];
symbolname = argv[1];
/*
* Open the library
*/
libhandle = dlopen(libname, mode);
printf("dlopen(%s, %s) = %p\n",
libname,
mode==RTLD_LAZY? "RTLD_LAZY":"RTLD_NOW",
libhandle);
if (libhandle == NULL)
{
fprintf(stderr, "*** ERROR: %s: dlopen failed: %s\n",
prgname,
dlerror());
exit(EXIT_FAILURE);
}
/*
* Get the symbol
*/
symbolhandle = dlsym(libhandle, symbolname);
printf("dlsym(%p, %s) = %p\n",
libhandle,
symbolname,
symbolhandle);
if (symbolhandle == NULL)
{
fprintf(stderr, "*** ERROR: %s: dlsym failed: %s\n",
prgname,
dlerror());
dlclose(libhandle);
exit(EXIT_FAILURE);
}
/*
* close the library
*/
ret = dlclose(libhandle);
printf("dlclose(%p) = %d\n",
libhandle,
ret);
if (ret != 0)
{
fprintf(stderr, "*** ERROR: %s: dlclose failed: %s\n",
prgname,
dlerror());
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
|
--
Gruß, virtual
Quote of the Month
Ich eß' nur was ein Gesicht hat (Creme 21)
Dieser Post wurde am 25.04.2003 um 10:44 Uhr von virtual editiert. |
