1 #define _DEFAULT_SOURCE

     2 #include <stdio.h>

     3 #include <stdlib.h>

     4 #include <unistd.h>

     5 #include <string.h>

     6 #include <errno.h>

     7 

     8 #include "config.h"

     9 

    10 int

    11 main(void)

    12 {

    13     while (1) {

    14         char line[513];

    15         FILE *fd;

    16 

    17         fd = fopen("/proc/meminfo", "r");

    18         if (fd == NULL) {

    19             perror("fopen");

    20             exit(1);

    21         }

    22 

    23         int free = 0;

    24         int total = 0;

    25         int sub;

    26         while (!feof(fd)) {

    27             if (fgets(line, sizeof(line)-1, fd) == NULL)

    28                 break;

    29 

    30             if (!strncmp(line, "MemTotal", 8))

    31                 sscanf(line+9, "%*[ ]%d%*[^\n]", &total);

    32 

    33             if (!strncmp(line, "MemFree", 7))

    34                 sscanf(line+8, "%*[ ]%d%*[^\n]", &free);

    35 

    36             if (!strncmp(line, "Buffers", 7)) {

    37                 sscanf(line+8, "%*[ ]%d%*[^\n]", &sub);

    38                 free += sub;

    39             }

    40             if (!strncmp(line, "Cached", 6)) {

    41                 sscanf(line+7, "%*[ ]%d%*[^\n]", &sub);

    42                 free += sub;

    43             }

    44         }

    45         fclose(fd);

    46 

    47         int used = total - free;

    48 

    49         char *color;

    50         if (used*1.0/total < GREEN) color = "color='green'";

    51         else if (used*1.0/total > RED) color = "color='red'";

    52         else if (used*1.0/total > ORANGE) color = "color='orange'";

    53         else color = "";

    54         printf("<span %s>%d/%d</span>\n", color, used/1024, total/1024);

    55         fflush(stdout);

    56 	sleep(UPDATE_PERIOD);

    57     }

    58 }