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Hi All,

Best wishes.

I have one library and a test program. I load library dynamically
using dlopen call from my test program. Inside my library i call
strdup and fopen.

If i compile my code as,
gcc -o test test.o -L/usr/lib -ldmalloc -ldl -lc, then fopen fails if
the file is not exists. (if the file is exists, then fclose fails).
Dmalloc error is:
debug-malloc library: dumping program, fatal error
Error: failed OVER picket-fence magic-number check (err 27)

If i compile my code, as
gcc -o test test.o -L/usr/lib -ldl -lc -ldmalloc, then free(strdup
("hello")) fails.
Dmalloc error is:
debug-malloc library: dumping program, fatal error
Error: pointer is not pointing to heap data space (err 21)

I have the code added below.

I should like compile my code so that i can overcome both the above
mentioned issue.

Your help will be greatly appreciated
Thanks,
Srikumar

test.c
------

#include <stdio.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <dlfcn.h>
#include <stdlib.h>

#include <dmalloc.h>

int main ()
{
void* dll_handle;
int (*my_fns)();

dll_handle = dlopen ("./libtestlib.so", RTLD_NOW | RTLD_GLOBAL);
if (dll_handle == NULL)
{
printf ("Unable to load %s.\n%s", "libtestlib.so", dlerror());
return 0;
}

my_fns = dlsym (dll_handle, "my_fns");

if (my_fns)
my_fns();

dlclose (dll_handle);
return 0;
}

testlib.c
---------
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#include <dmalloc.h>

int my_fns()
{
FILE * fp;
printf ("my_fns");
fp = fopen ("/etc/sample.cfg", "r");
printf ("after fopen");
if (fp)
fclose (fp);
printf ("after fclose");

free (strdup("hello"));
printf ("after strdup");
return 0;
}

testbuild.sh
------------
#!/bin/bash

DMALLOC_OPTIONS=debug=0x4f47d03,inter=1,log=/usr/dmalloc.logfile
export DMALLOC_OPTIONS

gcc -c -Wall testlib.c -g -DDMALLOC
ld -o libtestlib.so -shared testlib.o

gcc -c -Wall -g -DDMALLOC test.c

#gcc -o test test.o -L/usr/lib -ldmalloc -ldl -lc
gcc -o test test.o -L/usr/lib -ldl -lc -ldmalloc

./test

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