#include #include #include #define UTMP "/etc/utmp" #define NAMELEN 8 main() { FILE *fp; struct utmp u; struct passwd *p; char tmp[NAMELEN+1]; struct passwd *getpwnam(); if ((fp = fopen(UTMP, "r")) == NULL) { perror(UTMP); exit(1); } /* * For each entry... */ while (fread(&u, sizeof(u), 1, fp) != NULL) { /* * Skip non-logged in ports. */ if (u.ut_name[0] == NULL) continue; /* * Make sure name is null-terminated. */ strncpy(tmp, u.ut_name, NAMELEN); /* * Skip non-existent users (shouldn't * be any). */ if ((p = getpwnam(tmp)) == NULL) continue; /* * Print the line. ctime() converts the time * to ASCII format, it is described in Chapter * 7, Telling Time and Timing Things. We * ignore the format of the gecos field and * just print the first 30 characters; in real * life we would stop at a comma or some such. */ printf("%-10.8s %-10.8s %-30.30s %s", u.ut_name, u.ut_line, p->pw_gecos, ctime(&u.ut_time)); } fclose(fp); exit(0); } ion> net-next plumbingsTobias Klauser

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