get_mem.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "assert.h"
#include "xnet.h"

static unsigned long long bytes[2];

int __GetMemPoint()
{
        FILE *F1 = NULL;
        char line[1025] = { '\0' };
        char *word = NULL;
        unsigned long long mem_total = 0;
        unsigned long long mem_free = 0;
        unsigned long long mem_used = 0;

        F1 = fopen("/proc/meminfo", "r");
        if (F1 == NULL) {
                perror ("/proc/meminfo\n");
                return(1);
        }

        while (!feof(F1)) {
                fgets(line, 1024, F1);

                if (feof(F1))
                        break;

                word = strtok(line, ": ");
                if (word != NULL && !strcasecmp(word, "MemTotal")) {
                        word = strtok(NULL, " ");
                        if (word != NULL) {
                                /* fprintf(stderr, "%s ", word); /**/
                                sscanf(word, "%llu", &mem_total);
                                mem_total *= 1024;
                        }
                        else {
                                perror("strtok()\n");
                        }
                }
                else if (word != NULL && !strcasecmp(word, "MemFree")) {
                        word = strtok(NULL, " ");
                        if (word != NULL) {
                                /* fprintf(stderr, "%s ", word); /**/
                                sscanf(word, "%llu", &mem_free);
                                mem_free *= 1024;
                        }
                        else {
                                perror("strtok()\n");
                        }
                }
        }
        fclose(F1);

        bytes[0] = bytes[1];
        bytes[1] = mem_total - mem_free;

        /* fprintf(stderr, "%llu %llu %llu %llu\n", mem_total, mem_free, bytes[0], bytes[1]); /**/

        return(0);
}

void InitMemPoint()
{
        bytes[0] = 0;
        bytes[1] = 0;
        __GetMemPoint();
        __GetMemPoint();
}

void GetMemPoint( w, closure, call_data )
     Widget     w;
     XtPointer  closure;
     XtPointer  call_data;
{
        unsigned long long ull_value = 0;
        int i_value = 0;

        ASSERT(w != NULL);
        ASSERT(call_data != NULL);

        __GetMemPoint();

        ASSERT(w != NULL);

        if (bytes[1] > bytes[0]) {
                ull_value = bytes[1] - bytes[0];
        }
        else {
                ull_value = bytes[0] - bytes[1];
        }
        /* fprintf(stderr, "%llu ", ull_value); /**/

        i_value = (int)ull_value;
        /* fprintf(stderr, "%d ", i_value); /**/

        /* fprintf(stderr, "\n"); /**/

        *(int *)call_data = i_value;

        ASSERT(w != NULL);
}

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