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kbd
numlockbios.c
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File numlockbios.c of Package kbd
#include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> int main() { #define BIOS_DATA_AREA 0x400 #define BDA_KEYBOARD_STATUS_FLAGS_4 0x97 #define BDA_KSF4_NUMLOCK_MASK 0x02 int fdmem; char c; errno=0; fdmem = open("/dev/mem", O_RDONLY); if (fdmem < 0) { fprintf(stderr, "Couldn't open /dev/mem; %s\n", strerror(errno)); goto finish; } if (lseek(fdmem, BIOS_DATA_AREA + BDA_KEYBOARD_STATUS_FLAGS_4, SEEK_SET) == (off_t) -1) { fprintf(stderr, "Failed to seek /dev/mem: %s\n", strerror(errno)); goto finish; } if (read (fdmem, &c, sizeof(char)) == -1) { fprintf(stderr, "Failed to read /dev/mem: %s\n", strerror(errno)); goto finish; } if (c & BDA_KSF4_NUMLOCK_MASK) printf("on\n"); else printf("off\n"); finish: close(fdmem); if (errno) { printf("unknown\n"); exit(EXIT_FAILURE); } return 0; }
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