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faa52bdcc0
Make use of strerror(errno) and format all errors equally: function ['parameters']: error message
93 lines
2.0 KiB
C
93 lines
2.0 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 <ifaddrs.h>
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#include <linux/wireless.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <limits.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "../util.h"
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const char *
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wifi_perc(const char *iface)
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{
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int i, cur;
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float perc;
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int total = 70; /* the max of /proc/net/wireless */
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char *p, *datastart;
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char path[PATH_MAX];
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char status[5];
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FILE *fp;
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snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
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fp = fopen(path, "r");
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if (fp == NULL) {
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fprintf(stderr, "fopen '%s': %s\n", path, strerror(errno));
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return NULL;
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}
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p = fgets(status, 5, fp);
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fclose(fp);
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if(!p || strcmp(status, "up\n") != 0) {
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return NULL;
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}
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fp = fopen("/proc/net/wireless", "r");
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if (fp == NULL) {
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fprintf(stderr, "fopen '/proc/net/wireless': %s\n", strerror(errno));
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return NULL;
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}
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for (i = 0; i < 3; i++) {
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if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
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break;
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}
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fclose(fp);
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if (i < 2 || !p)
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return NULL;
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if ((datastart = strstr(buf, iface)) == NULL)
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return NULL;
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datastart = (datastart+(strlen(iface)+1));
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sscanf(datastart + 1, " %*d %d %*d %*d %*d %*d %*d %*d %*d %*d", &cur);
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perc = (float)cur / total * 100.0;
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return bprintf("%.0f", perc);
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}
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const char *
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wifi_essid(const char *iface)
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{
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static char id[IW_ESSID_MAX_SIZE+1];
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int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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struct iwreq wreq;
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memset(&wreq, 0, sizeof(struct iwreq));
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wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
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snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
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if (sockfd == -1) {
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fprintf(stderr, "socket 'AF_INET': %s\n", strerror(errno));
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return NULL;
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}
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wreq.u.essid.pointer = id;
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if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
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fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n", strerror(errno));
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close(sockfd);
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return NULL;
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}
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close(sockfd);
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if (strcmp(id, "") == 0)
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return NULL;
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else
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return id;
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}
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#endif
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