bool
_LSTransportShmInit(_LSTransportShm** shm, bool public_bus, LSError* lserror)
{
_LSTransportShm* ret_shm = g_new0(_LSTransportShm, 1);
if (!ret_shm)
{
_LSErrorSetOOM(lserror);
goto error;
}
ret_shm->data = _LSTransportShmInitOnce(public_bus, lserror);
if (ret_shm->data == MAP_FAILED)
{
goto error;
}
*shm = ret_shm;
return true;
error:
if (ret_shm) g_free(ret_shm);
return false;
}
/**
*******************************************************************************
* @brief Get the executable path for a given pid.
*
* @param pid IN pid
* @param lserror OUT set on error
*
* @retval executable path on success
* @retval NULL on failure
*******************************************************************************
*/
static char*
_LSTransportPidToExe(pid_t pid, LSError *lserror)
{
GError *error = NULL;
char *ret = NULL;
char *root = NULL;
char *exe = NULL;
char *proc_exe_path = g_strdup_printf("/proc/%d/exe", pid);
char *proc_root_path = g_strdup_printf("/proc/%d/root",pid);
if (!proc_exe_path || !proc_root_path)
{
_LSErrorSetOOM(lserror);
goto cleanup;
}
exe = g_file_read_link(proc_exe_path, &error);
if (!exe)
{
_LSErrorSetFromGError(lserror, error);
goto cleanup;
}
root = g_file_read_link(proc_root_path, &error);
if (!root)
{
_LSErrorSetFromGError(lserror, error);
goto cleanup;
}
int rootlen = strlen(root);
if ((rootlen > 1) && (strncmp(exe, root, rootlen) == 0))
{
/* /proc/<pid>/root is not a link to "/" so subtract
* it from the exe path (it's probably an app running in jail) */
ret = g_strdup(exe + rootlen);
}
else
{
ret = g_strdup(exe);
}
cleanup:
if (proc_exe_path) g_free(proc_exe_path);
if (proc_root_path) g_free(proc_root_path);
if (exe) g_free(exe);
if (root) g_free(root);
return ret;
}
/**
*******************************************************************************
* @brief Get the command line for a given pid.
*
* @param pid IN pid
* @param lserror OUT set on error
*
* @retval command line on success
* @retval NULL on failure
*******************************************************************************
*/
static char*
_LSTransportPidToCmdLine(pid_t pid, LSError *lserror)
{
GError *error = NULL;
char *cmd_line = NULL;
int i = 0;
gsize len = 0;
char *proc_cmd_line_path = g_strdup_printf("/proc/%d/cmdline", pid);
if (!proc_cmd_line_path)
{
_LSErrorSetOOM(lserror);
goto cleanup;
}
bool ret = g_file_get_contents(proc_cmd_line_path, &cmd_line, &len, &error);
if (!ret)
{
_LSErrorSetFromGError(lserror, error);
goto cleanup;
}
/* /proc/PID/cmdline has ASCII NUL instead of spaces, so replace all of
* them except for the last one */
for (i = 0; i < ((int)len) - 1; i++)
{
if (cmd_line[i] == '\0')
{
/* If we get two NULs in a row, we're at the end.
* g_file_get_contents() seems to return a larger size than
* necessary (calls fstat to determine size) */
if (cmd_line[i + 1] == '\0')
{
break;
}
else
{
cmd_line[i] = ' ';
}
}
}
cleanup:
if (proc_cmd_line_path) g_free(proc_cmd_line_path);
return cmd_line;
}
