hcq/MaxScale
hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Use getauxval for obtaining the executable path.

Browse Source 
It appears that reading /proc/self/exe actually can return the path
of the shared library from which the reading is made.
This commit is contained in:
Johan Wikman 2016-02-12 13:47:26 +02:00
parent d1ba050bfd
commit 0aaba6bc5f
1 changed files with 34 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
query_classifier/qc_pp/qc_pp.c
View File

@ -22,6 +22,8 @@
*
*/
#include <sys/auxv.h>
#include <elf.h>
#include <log_manager.h>
#include <modules.h>
#include <query_classifier.h>
@ -86,53 +88,48 @@ static void end_and_unload_classifier(QUERY_CLASSIFIER* classifier, const char*
static bool resolve_pp_path(char* path, int size)
{
bool success = false;
ssize_t sz = readlink("/proc/self/exe", path, size);
const char* exe_path = (const char*) getauxval(AT_EXECFN);
size_t len = strlen(exe_path);
if (sz >= 0)
if (len < size)
{
if (sz == size)
strcpy(path, exe_path);
char* s = path + len;
// Find the last '/'.
while ((*s != '/') && (s != path))
{
MXS_ERROR("The full path of the current executable does not fit in a "
"buffer of %d bytes.", size);
--s;
--len;
}
if (*s == '/')
{
++s;
++len;
}
*s = 0;
int required_size = len + sizeof(MAXPP) + 1;
if (required_size <= size)
{
strcat(path, MAXPP);
MXS_NOTICE("Path of plugin process executable: %s", path);
success = true;
}
else
{
char* s = path + sz;
// Find the last '/'.
while ((*s != '/') && (s != path))
{
--s;
--sz;
}
if (*s == '/')
{
++s;
++sz;
}
*s = 0;
int required_size = sz + sizeof(MAXPP) + 1;
if (required_size + 1 <= size)
{
strcat(path, MAXPP);
MXS_NOTICE("Path of plugin process executable: %s", path);
success = true;
}
else
{
MXS_ERROR("The full path of the plugin process executable does "
"not fit into a buffer of %d bytes. ", size);
}
MXS_ERROR("The full path of the plugin process executable does "
"not fit into a buffer of %d bytes. ", size);
}
}
else
{
MXS_ERROR("Could not establish location of current process.");
MXS_ERROR("The full path of the current executable does not fit in a "
"buffer of %d bytes.", size);
}
return success;