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Ditch using the libutil, it is not async-signal safe.

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This commit is contained in:
Konstantin Belousov 2010-04-11 14:36:24 +03:00
parent 69001646fa
commit e33fa9f73c
1 changed files with 55 additions and 22 deletions
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77
src/os-freebsd.c
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@ -24,41 +24,74 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#ifndef UNW_REMOTE_ONLY
#include <sys/param.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <libutil.h>
#include <stdio.h>
#include "libunwind_i.h"
static void *
get_mem(size_t sz)
{
void *res;
res = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
if (res == MAP_FAILED)
return (NULL);
return (res);
}
static void
free_mem(void *ptr, size_t sz)
{
munmap(ptr, sz);
}
PROTECTED int
tdep_get_elf_image (struct elf_image *ei, pid_t pid, unw_word_t ip,
unsigned long *segbase, unsigned long *mapoff)
{
struct kinfo_vmentry *freep, *kve;
int cnt, rc, i;
int mib[4], error, ret;
size_t len, len1;
char *buf, *bp, *eb;
struct kinfo_vmentry *kv;
freep = kinfo_getvmmap(pid, &cnt);
if (freep == NULL)
len = 0;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_VMMAP;
mib[3] = pid;
error = sysctl(mib, 4, NULL, &len, NULL, 0);
if (error)
return (-1);
for (i = 0; i < cnt; i++)
{
kve = &freep[i];
if (ip < kve->kve_start || ip >= kve->kve_end)
continue;
if (kve->kve_type != KVME_TYPE_VNODE)
{
free(freep);
return (-1);
}
*segbase = kve->kve_start;
*mapoff = kve->kve_offset;
rc = elf_map_image(ei, kve->kve_path);
free(freep);
return (rc);
}
free(freep);
return (-1);
len1 = len * 4 / 3;
buf = get_mem(len1);
if (buf == NULL)
return (-1);
error = sysctl(mib, 4, buf, &len, NULL, 0);
if (error) {
free_mem(buf, len1);
return (-1);
}
ret = -1;
for (bp = buf, eb = buf + len; bp < eb; bp += kv->kve_structsize) {
kv = (struct kinfo_vmentry *)(uintptr_t)bp;
if (ip < kv->kve_start || ip >= kv->kve_end)
continue;
if (kv->kve_type != KVME_TYPE_VNODE)
break;
*segbase = kv->kve_start;
*mapoff = kv->kve_offset;
ret = elf_map_image(ei, kv->kve_path);
break;
}
free_mem(buf, len1);
return (ret);
}
#endif /* UNW_REMOTE_ONLY */