faa52bdcc0
Make use of strerror(errno) and format all errors equally: function ['parameters']: error message
139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/* See LICENSE file for copyright and license details. */
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#if defined(__linux__)
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "../util.h"
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const char *
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swap_free(void)
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{
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long total, free;
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FILE *fp;
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size_t bytes_read;
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char *match;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
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return NULL;
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}
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if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
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fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
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fclose(fp);
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return NULL;
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}
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fclose(fp);
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if ((match = strstr(buf, "SwapTotal")) == NULL)
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return NULL;
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sscanf(match, "SwapTotal: %ld kB\n", &total);
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if ((match = strstr(buf, "SwapFree")) == NULL)
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return NULL;
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sscanf(match, "SwapFree: %ld kB\n", &free);
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return bprintf("%f", (float)free / 1024 / 1024);
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}
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const char *
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swap_perc(void)
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{
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long total, free, cached;
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FILE *fp;
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size_t bytes_read;
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char *match;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
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return NULL;
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}
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if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
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fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
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fclose(fp);
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return NULL;
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}
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fclose(fp);
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if ((match = strstr(buf, "SwapTotal")) == NULL)
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return NULL;
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sscanf(match, "SwapTotal: %ld kB\n", &total);
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if ((match = strstr(buf, "SwapCached")) == NULL)
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return NULL;
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sscanf(match, "SwapCached: %ld kB\n", &cached);
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if ((match = strstr(buf, "SwapFree")) == NULL)
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return NULL;
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sscanf(match, "SwapFree: %ld kB\n", &free);
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return bprintf("%d", 100 * (total - free - cached) / total);
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}
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const char *
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swap_total(void)
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{
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long total;
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FILE *fp;
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size_t bytes_read;
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char *match;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
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return NULL;
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}
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if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
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fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
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fclose(fp);
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return NULL;
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}
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fclose(fp);
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if ((match = strstr(buf, "SwapTotal")) == NULL)
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return NULL;
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sscanf(match, "SwapTotal: %ld kB\n", &total);
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return bprintf("%f", (float)total / 1024 / 1024);
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}
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const char *
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swap_used(void)
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{
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long total, free, cached;
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FILE *fp;
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size_t bytes_read;
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char *match;
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fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
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return NULL;
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}
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if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
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fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
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fclose(fp);
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return NULL;
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}
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fclose(fp);
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if ((match = strstr(buf, "SwapTotal")) == NULL)
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return NULL;
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sscanf(match, "SwapTotal: %ld kB\n", &total);
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if ((match = strstr(buf, "SwapCached")) == NULL)
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return NULL;
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sscanf(match, "SwapCached: %ld kB\n", &cached);
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if ((match = strstr(buf, "SwapFree")) == NULL)
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return NULL;
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sscanf(match, "SwapFree: %ld kB\n", &free);
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return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
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}
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#endif
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