dlopen broken?
John Lancaster
John.Lancaster at brunel.ac.uk
Mon Aug 6 20:24:30 AEST 1990
Is the program interface to the dynamic linker (dlopen) broken?
The following program will cause a segmentation error when the second call
to dlopen is made. If the first call to dlclose is deleted the program
will run. It appears that after a call to dlclose dlopen can no longer be
called. This is not the behaviour implied by the manual.
Has anyone got this to work? Have I misunderstood the documentation?
Test program:
#include<dlfcn.h>
main()
{
int closeResult;
static int *handle;
char *file, *symbol;
int (*symAdr)();
p1();
file = "p2.out";
handle = dlopen(file,1);
printf("returned handle of %s is %x\n",file,handle);
printf("dlerror: %s\n",dlerror());
symbol = "_p2";
symAdr = dlsym(handle,symbol);
printf("returned symbol address of %s is %x\n",symbol,symAdr);
(*symAdr)();
closeResult = dlclose(handle); /** this line the problem **/
printf("dlclose call returned %d\n",closeResult);
printf("dlerror: %s\n",dlerror());
file = "p3.out";
handle = dlopen(file,1);
printf("returned handle of %s is %x\n",file,handle);
symbol = "_p3";
symAdr = dlsym(handle,symbol);
printf("returned symbol address of %s is %x\n",symbol,symAdr);
(*symAdr)();
closeResult = dlclose(handle);
printf("dlclose call returned %d\n",closeResult);
printf("dlerror: %s\n",dlerror());
exit(0);
}
p1()
{
printf("inside p1\n");
return;
}
John Lancaster Email: J.Lancaster at brunel.ac.uk
Brunel University Phone: +44 (0)895 74000 ext 2330
Uxbridge Fax: +44 (0)895 58728
England Telex: 261173 G
UB8 3PH
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