prototype layout
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.gitignore
vendored
1
.gitignore
vendored
@ -2,3 +2,4 @@
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*.swp
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*.o
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bmon*
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!bmon.c
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77
bmon.c
77
bmon.c
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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 <fcntl.h>
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#include <dirent.h>
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#include <poll.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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char *bat_power_path = "/sys/class/power_supply/BAT1/energy_now";
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char *bat_capacity_path = "/sys/class/power_supply/BAT1/capacity";
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//char *bat_power_path = "/sys/class/power_supply/BAT1/energy_now";
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//char *bat_capacity_path = "/sys/class/power_supply/BAT1/capacity";
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const char *bat_base_path = "/sys/class/power_supply/";
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void usage (void)
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{
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printf("usage: bmon [-w]\n");
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}
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int main (int argc, char *argv[])
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{
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int wflag = 0;
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int opc;
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while ((opc = getopt(argc, argv, "w")) != -1) {
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switch (opc) {
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case 'w':
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wflag = 1;
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break;
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default: /* '?' */
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usage();
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exit(1);
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break;
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}
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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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struct dirent *ent = NULL;
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int *fd_list = NULL;
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int fd_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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else break;
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}
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if (!strstr(ent->d_name, "BAT1"))
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continue;
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int fd;
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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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strcat(path, "/energy_now");
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else strcat(path, "/capacity");
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if ((fd = open(path, O_RDONLY | O_NONBLOCK)) != -1) {
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int *tmp = NULL;
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tmp = realloc(fd_list, sizeof(int) * (fd_num + 1));
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if (!tmp)
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perror("failed realloc");
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fd_list = tmp;
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fd_list[fd_num] = fd;
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fd_num++;
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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 (!fd_num)
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printf("no files were opened\n");
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for (int i = 0; i < fd_num; i++)
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close(fd_list[i]);
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return 0;
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}
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