X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/efb41724b5499bf61ab65ff65908d686e59ecdc0..7fe240856eef7b56d8ca0b57fd5642dbdc5b89b1:/components/swap.c?ds=sidebyside diff --git a/components/swap.c b/components/swap.c index f6f8993..9bd599a 100644 --- a/components/swap.c +++ b/components/swap.c @@ -1,78 +1,84 @@ /* See LICENSE file for copyright and license details. */ #include +#include #include +#include #include #include "../util.h" #if defined(__linux__) - static size_t - pread(const char *path, char *buf, size_t bufsiz) + static int + get_swap_info(long *s_total, long *s_free, long *s_cached) { FILE *fp; - size_t bytes_read; - - if (!(fp = fopen(path, "r"))) { - fprintf(stderr, "fopen '%s': %s\n", path, - strerror(errno)); - return 0; + struct { + const char *name; + const size_t len; + long *var; + } ent[] = { + { "SwapTotal", sizeof("SwapTotal") - 1, s_total }, + { "SwapFree", sizeof("SwapFree") - 1, s_free }, + { "SwapCached", sizeof("SwapCached") - 1, s_cached }, + }; + size_t line_len = 0, i, left; + char *line = NULL; + + /* get number of fields we want to extract */ + for (i = 0, left = 0; i < LEN(ent); i++) { + if (ent[i].var) { + left++; + } } - if ((bytes_read = fread(buf, sizeof(char), bufsiz, fp)) == 0) { - fprintf(stderr, "fread '%s': %s\n", path, - strerror(errno)); - fclose(fp); - return 0; + + if (!(fp = fopen("/proc/meminfo", "r"))) { + warn("fopen '/proc/meminfo':"); + return 1; } - fclose(fp); - buf[bytes_read] = '\0'; + /* read file line by line and extract field information */ + while (left > 0 && getline(&line, &line_len, fp) >= 0) { + for (i = 0; i < LEN(ent); i++) { + if (ent[i].var && + !strncmp(line, ent[i].name, ent[i].len)) { + sscanf(line + ent[i].len + 1, "%ld kB\n", + ent[i].var); + left--; + break; + } + } + } + free(line); + if (ferror(fp)) { + warn("getline '/proc/meminfo':"); + return 1; + } - return bytes_read; + fclose(fp); + return 0; } const char * swap_free(void) { - long total, free; - char *match; + long free; - if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) { + if (get_swap_info(NULL, &free, NULL)) { return NULL; } - if ((match = strstr(buf, "SwapTotal")) == NULL) - return NULL; - sscanf(match, "SwapTotal: %ld kB\n", &total); - - if ((match = strstr(buf, "SwapFree")) == NULL) - return NULL; - sscanf(match, "SwapFree: %ld kB\n", &free); - - return bprintf("%f", (float)free / 1024 / 1024); + return fmt_human(free * 1024, 1024); } const char * swap_perc(void) { long total, free, cached; - char *match; - if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) { + if (get_swap_info(&total, &free, &cached) || total == 0) { return NULL; } - if ((match = strstr(buf, "SwapTotal")) == NULL) - return NULL; - sscanf(match, "SwapTotal: %ld kB\n", &total); - - if ((match = strstr(buf, "SwapCached")) == NULL) - return NULL; - sscanf(match, "SwapCached: %ld kB\n", &cached); - - if ((match = strstr(buf, "SwapFree")) == NULL) - return NULL; - sscanf(match, "SwapFree: %ld kB\n", &free); - return bprintf("%d", 100 * (total - free - cached) / total); } @@ -80,82 +86,65 @@ swap_total(void) { long total; - char *match; - if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) { + if (get_swap_info(&total, NULL, NULL)) { return NULL; } - if ((match = strstr(buf, "SwapTotal")) == NULL) - return NULL; - sscanf(match, "SwapTotal: %ld kB\n", &total); - - return bprintf("%f", (float)total / 1024 / 1024); + return fmt_human(total * 1024, 1024); } const char * swap_used(void) { long total, free, cached; - char *match; - if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) { + if (get_swap_info(&total, &free, &cached)) { return NULL; } - if ((match = strstr(buf, "SwapTotal")) == NULL) - return NULL; - sscanf(match, "SwapTotal: %ld kB\n", &total); - - if ((match = strstr(buf, "SwapCached")) == NULL) - return NULL; - sscanf(match, "SwapCached: %ld kB\n", &cached); - - if ((match = strstr(buf, "SwapFree")) == NULL) - return NULL; - sscanf(match, "SwapFree: %ld kB\n", &free); - - return bprintf("%f", (float)(total - free - cached) / 1024 / 1024); + return fmt_human((total - free - cached) * 1024, 1024); } #elif defined(__OpenBSD__) #include - #include /* dbtob */ #include #include #include - #define dbtoqb(b) dbtob((int64_t)(b)) - - static void + static int getstats(int *total, int *used) { struct swapent *sep, *fsep; int rnswap, nswap, i; - nswap = swapctl(SWAP_NSWAP, 0, 0); - if (nswap < 1) - fprintf(stderr, "swaptctl 'SWAP_NSWAP': %s\n", strerror(errno)); - - fsep = sep = calloc(nswap, sizeof(*sep)); - if (sep == NULL) - fprintf(stderr, "calloc 'nswap': %s\n", strerror(errno)); - - rnswap = swapctl(SWAP_STATS, (void *)sep, nswap); - if (rnswap < 0) - fprintf(stderr, "swapctl 'SWAP_STATA': %s\n", strerror(errno)); - - if (nswap != rnswap) - fprintf(stderr, "SWAP_STATS != SWAP_NSWAP\n"); + if ((nswap = swapctl(SWAP_NSWAP, 0, 0)) < 1) { + warn("swaptctl 'SWAP_NSWAP':"); + return 1; + } + if (!(fsep = sep = calloc(nswap, sizeof(*sep)))) { + warn("calloc 'nswap':"); + return 1; + } + if ((rnswap = swapctl(SWAP_STATS, (void *)sep, nswap)) < 0) { + warn("swapctl 'SWAP_STATA':"); + return 1; + } + if (nswap != rnswap) { + warn("getstats: SWAP_STATS != SWAP_NSWAP"); + return 1; + } *total = 0; *used = 0; for (i = 0; i < rnswap; i++) { - *total += dbtoqb(sep->se_nblks); - *used += dbtoqb(sep->se_inuse); + *total += sep->se_nblks >> 1; + *used += sep->se_inuse >> 1; } free(fsep); + + return 0; } const char * @@ -163,9 +152,11 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } - return bprintf("%f", (float)(total - used) / 1024 / 1024 / 1024); + return fmt_human((total - used) * 1024, 1024); } const char * @@ -173,7 +164,13 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } + + if (total == 0) { + return NULL; + } return bprintf("%d", 100 * used / total); } @@ -183,9 +180,11 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } - return bprintf("%f", (float)total / 1024 / 1024 / 1024); + return fmt_human(total * 1024, 1024); } const char * @@ -193,8 +192,10 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } - return bprintf("%f", (float)used / 1024 / 1024 / 1024); + return fmt_human(used * 1024, 1024); } #endif