I'm trying to setup a pending breakpoint for sin() and cos() which are
dlsym()ed from libm.so
(sample attached), and an attempt to continue execution seems just hangs the
debugger. For example:
(lldb) attach 17043
Process 17043 stopped
* thread #1, name = 't-dlopen', stop reason = signal SIGSTOP
frame #0: 0x0000000000400728 t-dlopen`main(argc=1, argv=0x00007ffd2b0a00c8)
at t-dlopen.c:21
18 for (a = 0; a < DELAY + argc; a++)
19 for (b = 0; b < DELAY + argc; b++)
20 for (c = 0; c < DELAY + argc; c++)
-> 21 z += a + b + c;
22 while (1)
23 {
24 void *handle = dlopen (LIBM_SO, RTLD_LAZY);
Executable module set to "/home/dantipov/tmp/t-dlopen".
Architecture set to: x86_64--linux.
(lldb) breakpoint set -n sin
Breakpoint 1: no locations (pending).
WARNING: Unable to resolve breakpoint to any actual locations.
(lldb) breakpoint set -n cos
Breakpoint 2: no locations (pending).
WARNING: Unable to resolve breakpoint to any actual locations.
(lldb) process continue ;; After this, nothing
happens for a long time
Process 17043 resuming
(lldb) process status ;; After this, lldb hangs
and have to be killed
I've tried 6.0.0-rc2 as well as 7.0.0 svn trunk 325127, with the same
disappointing results.
Dmitry
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#ifdef __ANDROID__
#define LIBM_SO "libm.so"
#define DELAY 1500
#else
#include <gnu/lib-names.h>
#define DELAY 2000
#endif
int
main (int argc, char *argv[])
{
/* Busy loop long enough to attach the debugger before dlopen happens. */
int a, b, c, z = 0;
for (a = 0; a < DELAY + argc; a++)
for (b = 0; b < DELAY + argc; b++)
for (c = 0; c < DELAY + argc; c++)
z += a + b + c;
while (1)
{
void *handle = dlopen (LIBM_SO, RTLD_LAZY);
if (handle)
{
int i;
double sum = 0.0;
double (*sinptr) (double) = dlsym (handle, "sin");
double (*cosptr) (double) = dlsym (handle, "cos");
for (i = 0; i < 10; i++)
sum += sinptr (drand48 ()) + cosptr (drand48 ());
printf ("%lf\n", sum);
dlclose (handle);
}
sleep (1);
}
return z;
}
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