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#define _GNU_SOURCE #include <sys/time.h> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <string.h> #include <stdint.h> #include <signal.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> #include <sys/stat.h> int beep(void){ printf("\a"); fflush(stdout); usleep(200000); printf("\a"); fflush(stdout); usleep(200000); printf("\a"); fflush(stdout); return 0; } void sig_handler (int sig) { /*dummy signal handler*/ } int main(int argc, char **argv) { struct stat filestat; char *pathptr; int fd; pathptr = getenv("MAIL"); if (pathptr == NULL) { fprintf(stderr, "Environment variable $MAIL is not set.\n"); exit(-1); } if (0 != stat (pathptr, &filestat)) { printf ("file %s does not exist\n", pathptr); return (-1); } if (filestat.st_atime < filestat.st_ctime){ beep(); } fd = open(pathptr, O_RDONLY); if (fd == -1){ printf("Error %d (%s)\n", errno, strerror(errno)); exit(-1); } signal(SIGIO, sig_handler); while (1){ fcntl(fd, F_SETLEASE, F_RDLCK); pause(); beep(); } close(fd); return 0; }
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