2.3 函数voidset_pglocale_pgservice(const char *argv0,const char *app)
设置一些环境变量信息
/*
* set_pglocale_pgservice
*
* Set application-specific locale and service directory
*
* This function takes the value of argv[0] rather than a full path.
*
* (You may be wondering why this is in exec.c. It requires this module's
* services and doesn't introduce any new dependencies,so this seems as
* good as anyplace.)
*/
void
set_pglocale_pgservice(const char *argv0,const char *app)
{
char path[MAXPGPATH];
char my_exec_path[MAXPGPATH];
char env_path[MAXPGPATH + sizeof("PGSYSconfdIR=")]; /* longer than
* PGLOCALEDIR */
/* don't set LC_ALL in the backend */
if (strcmp(app,PG_TEXTDOMAIN("postgres")) != 0)
setlocale(LC_ALL,"");
if (find_my_exec(argv0,my_exec_path) < 0)
return;
#ifdef ENABLE_NLS
get_locale_path(my_exec_path,path);
bindtextdomain(app,path);
textdomain(app);
if (getenv("PGLOCALEDIR") == NULL)
{
/* set for libpq to use */
snprintf(env_path,sizeof(env_path),"PGLOCALEDIR=%s",path);
canonicalize_path(env_path + 12);
putenv(strdup(env_path));
}
#endif
if (getenv("PGSYSconfdIR") == NULL)
{
get_etc_path(my_exec_path,path);
/* set for libpq to use */
snprintf(env_path,"PGSYSconfdIR=%s",path);
canonicalize_path(env_path + 13);
putenv(strdup(env_path));
}
}附加信息：
（1）环境变量
