Для Иксов есть стандартный модуль Xrm, man -k Xrm

Пример есть простейший под рукой,

/* Xrm example program */
#include <X11/Xlib.h>
#include <X11/Xresource.h>
#include <stdio.h>
#include <string.h>

main(int argc, char **argv)
{
    XrmValue xrmv;
    char *type, *value;
    int status;
    XrmDatabase db;

    /* initialize Xrm and load our database */
    XrmInitialize();
    db = XrmGetFileDatabase(".myrc");

    /* retrieve our resource and print out the value */
    status = XrmGetResource(db, "myResource",
        "MyResource", &type, &xrmv);
    if (status && (strcmp(type, "String") == 0)) {
        value = (char *) xrmv.addr;
        printf("resource was %s\n", value);
    } else
        printf("resource does not exist\n");

    /* change the value of the resource */
    XrmPutLineResource(&db, "myResource: newValue");

    /* write database back to file */
    XrmPutFileDatabase(db, ".myrc");

    /* free the database from memory */
    XrmDestroyDatabase(db);
}

Die-Hard ★★★★★
(05.11.04 16:47:30 MSK)