static char *sccsid = "@(#)atrun.c 4.3 (Berkeley) 10/21/82"; /* * Run programs submitted by at. */ #include <stdio.h> #include <sys/param.h> #include <sys/dir.h> #include <time.h> #include <sys/stat.h> # define ATDIR "/usr/spool/at" # define PDIR "past" # define LASTF "/usr/spool/at/lasttimedone" int nowtime; int nowdate; int nowyear; main(argc, argv) char **argv; { int tt, day, year, uniq; struct direct *dirent; DIR *dirp; chdir(ATDIR); makenowtime(); if ((dirp = opendir(".")) == NULL) { fprintf(stderr, "Cannot read at directory\n"); exit(1); } while ((dirent = readdir(dirp)) != NULL) { if (dirent->d_ino==0) continue; if (sscanf(dirent->d_name, "%2d.%3d.%4d.%2d", &year, &day, &tt, &uniq) != 4) continue; if (nowyear < year) continue; if (nowyear==year && nowdate < day) continue; if (nowyear==year && nowdate==day && nowtime < tt) continue; run(dirent->d_name); } closedir(dirp); updatetime(nowtime); exit(0); } makenowtime() { long t; struct tm *localtime(); register struct tm *tp; time(&t); tp = localtime(&t); nowtime = tp->tm_hour*100 + tp->tm_min; nowdate = tp->tm_yday; nowyear = tp->tm_year; } updatetime(t) { FILE *tfile; tfile = fopen(LASTF, "w"); if (tfile == NULL) { fprintf(stderr, "can't write lastfile\n"); exit(1); } fprintf(tfile, "%04d\n", t); } run(file) char *file; { struct stat stbuf; register pid, i; char sbuf[64]; /* printf("running %s\n", file); */ if (fork()!=0) return; for (i=0; i<15; i++) close(i); dup(dup(open("/dev/null", 0))); sprintf(sbuf, "%s/%s", PDIR, file); link(file, sbuf); unlink(file); chdir(PDIR); if (stat(file, &stbuf) == -1) exit(1); if (pid = fork()) { if (pid == -1) exit(1); wait((int *)0); unlink(file); exit(0); } setgid(stbuf.st_gid); setuid(stbuf.st_uid); execl("/bin/sh", "sh", file, 0); execl("/usr/bin/sh", "sh", file, 0); fprintf(stderr, "Can't execl shell\n"); exit(1); }