better code
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710b99c54e
commit
51d07394e7
174
bmon.c
174
bmon.c
@ -1,8 +1,10 @@
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#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <errno.h>
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@ -10,8 +12,12 @@
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#include <unistd.h>
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#include <signal.h>
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#include <time.h>
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#include <limits.h>
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const char *bat_base_path = "/sys/class/power_supply/";
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// TODO: handle multiple batteries
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const char *CAPACITY_PATH = "/sys/class/power_supply/BAT1/capacity";
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const char *STATUS_PATH = "/sys/class/power_supply/BAT1/status";
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const char *POWER_PATH = "/sys/class/power_supply/BAT1/power_now";
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int dead = 0;
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void usage (void)
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@ -26,17 +32,26 @@ void usage (void)
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void int_handler (int signum)
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{
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(void)signum;
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dead = 1;
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}
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int read_int (FILE *fp)
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{
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int x;
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freopen(NULL, "r", fp);
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fscanf(fp, "%d", &x);
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return x;
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}
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int main (int argc, char *argv[])
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{
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/* Handle SIGINT */
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dead = 0;
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = int_handler;
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sigaction(SIGINT, &action, NULL);
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dead = 0;
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = int_handler;
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sigaction(SIGINT, &action, NULL);
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int wflag = 0;
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int wait_time = 10;
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@ -73,100 +88,87 @@ int main (int argc, char *argv[])
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}
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DIR *bdir = NULL;
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if (!(bdir = opendir(bat_base_path))) {
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perror("error opening base directory");
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FILE *capacity_fp = NULL, *status_fp = NULL, *power_fp = NULL;
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capacity_fp = fopen(CAPACITY_PATH, "r");
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if (capacity_fp == NULL) {
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fprintf(stderr, "Error opening %s: %s\n", CAPACITY_PATH, strerror(errno));
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exit(1);
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}
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struct dirent *ent = NULL;
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FILE **fp_list = NULL;
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int fp_num = 0;
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for (;;) {
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errno = 0;
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if (!(ent = readdir(bdir))) {
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if (errno) {
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perror("error reading base directory");
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exit(1);
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}
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else break;
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if (wflag) {
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power_fp = fopen(POWER_PATH, "r");
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if (power_fp == NULL) {
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fprintf(stderr, "Error opening %s: %s\n", POWER_PATH, strerror(errno));
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exit(1);
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}
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status_fp = fopen(STATUS_PATH, "r");
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if (status_fp == NULL) {
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fprintf(stderr, "Error opening %s: %s\n", STATUS_PATH, strerror(errno));
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exit(1);
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}
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if (!strstr(ent->d_name, "BAT1"))
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continue;
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FILE *fp;
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char path[sizeof(bat_base_path) + 256 + 64];
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strcpy(path, bat_base_path);
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strcat(path, ent->d_name);
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if (wflag) {
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char *tmp = malloc(1024);
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strcpy(tmp, path);
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strcat(tmp, "/status");
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FILE *tmf = fopen(tmp, "r");
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fgets(tmp, 1024, tmf);
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if (!strstr(tmp, "Dis")) {
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fprintf(stderr, "currently not discharging, cannot read power draw\n");
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dead = 1;
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}
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fclose(tmf);
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free(tmp);
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strcat(path, "/power_now");
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} else strcat(path, "/capacity");
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if ((fp = fopen(path, "r"))) {
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FILE **tmp = NULL;
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tmp = realloc(fp_list, sizeof(FILE *) * (fp_num + 1));
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if (!tmp)
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perror("failed realloc");
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fp_list = tmp;
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fp_list[fp_num++] = fp;
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} else printf("err: %s\n", strerror(errno));
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}
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closedir(bdir);
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if (!fp_num) {
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printf("no files were opened\n");
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dead = 1;
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}
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FILE * ofile_ptr = stdout;
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FILE *output_fp = stdout;
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if (fflag) {
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if (!(ofile_ptr = fopen(ofile_path, "w"))) {
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char *tmp = malloc(1024);
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snprintf(tmp, 1024, "could not open %s", ofile_path);
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perror(tmp);
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free(tmp);
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if ((output_fp = fopen(ofile_path, "w")) == NULL) {
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fprintf(stderr, "Error opening %s: %s\n", ofile_path, strerror(errno));
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exit(1);
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}
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}
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long int elapsed_time = 0;
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long val;
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char buf[64];
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for (; !dead ; sleep(wait_time)) {
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for (int i = 0; i < fp_num; i++) {
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if (!freopen(NULL, "r", fp_list[i])) {
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perror("error reading the file");
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dead = 1;
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fprintf(output_fp, "TIME\t");
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fprintf(output_fp, "CAP\t");
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if (wflag) fprintf(output_fp, "WATTS");
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fprintf(output_fp, "\n");
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while (!dead) {
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int capacity = read_int(capacity_fp);
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float power = 0;
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if (capacity < 0) {
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fprintf(stderr, "Error reading capacity: %s\n", strerror(errno));
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break;
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}
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if (wflag) {
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power = read_int(power_fp);
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if (power < 0) {
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fprintf(stderr, "Error reading power: %s\n", strerror(errno));
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break;
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}
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if (!fgets(buf, 64, fp_list[i]))
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dead = 1;
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val = atol(buf);
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fprintf(ofile_ptr, "%ld\t", wflag ? (long)(val / 1E3) : val);
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}
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fprintf(ofile_ptr, "%ld\n", uflag ? time(NULL) : elapsed_time);
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if (fflush(ofile_ptr)) {
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perror("error writing to file");
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dead = 1;
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static char b[128] = {0};
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freopen(NULL, "r", status_fp);
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if (fgets(b, sizeof(b), status_fp) == NULL) {
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fprintf(stderr, "Error reading status: %s\n", strerror(errno));
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}
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if (strncmp(b, "Discharging\n", sizeof(b)) == 0) {
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power *= -1;
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}
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// power is in microwatts
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power /= 1e6;
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}
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fprintf(output_fp, "%ld\t", uflag ? time(NULL) : elapsed_time);
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fprintf(output_fp, "%d\t", capacity);
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if (wflag) fprintf(output_fp, "%.2f", power);
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fprintf(output_fp, "\n");
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sleep(wait_time);
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elapsed_time += wait_time;
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}
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if (fflag)
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fclose(ofile_ptr);
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for (int i = 0; i < fp_num; i++)
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fclose(fp_list[i]);
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free(fp_list);
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if (fflag) {
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fclose(output_fp);
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}
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if (capacity_fp) {
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fclose(capacity_fp);
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}
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if (status_fp) {
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fclose(status_fp);
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}
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if (power_fp) {
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fclose(power_fp);
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}
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return 0;
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}
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