c432c8f856
This is the conclusion of an effort to get LLDB's Python code structured into a bona-fide Python package. This has a number of benefits, but most notably the ability to more easily share Python code between different but related pieces of LLDB's Python infrastructure (for example, `scripts` can now share code with `test`). llvm-svn: 251532
59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
#include <sys/mman.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
|
|
enum {
|
|
kMmapSize = 0x1000,
|
|
kMagicValue = 47,
|
|
};
|
|
|
|
void *address;
|
|
volatile sig_atomic_t signaled = 0;
|
|
|
|
void handler(int sig)
|
|
{
|
|
signaled = 1;
|
|
if (munmap(address, kMmapSize) != 0)
|
|
{
|
|
perror("munmap");
|
|
_exit(5);
|
|
}
|
|
|
|
void* newaddr = mmap(address, kMmapSize, PROT_READ | PROT_WRITE,
|
|
MAP_ANON | MAP_FIXED | MAP_PRIVATE, -1, 0);
|
|
if (newaddr != address)
|
|
{
|
|
fprintf(stderr, "Newly mmaped address (%p) does not equal old address (%p).\n",
|
|
newaddr, address);
|
|
_exit(6);
|
|
}
|
|
*(int*)newaddr = kMagicValue;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
if (signal(SIGSEGV, handler) == SIG_ERR)
|
|
{
|
|
perror("signal");
|
|
return 1;
|
|
}
|
|
|
|
address = mmap(NULL, kMmapSize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
|
|
if (address == MAP_FAILED)
|
|
{
|
|
perror("mmap");
|
|
return 2;
|
|
}
|
|
|
|
// This should first trigger a segfault. Our handler will make the memory readable and write
|
|
// the magic value into memory.
|
|
if (*(int*)address != kMagicValue)
|
|
return 3;
|
|
|
|
if (! signaled)
|
|
return 4;
|
|
|
|
return 0;
|
|
}
|