64   if (ret == MAP_FAILED) perror_exit("mmap");  in xmmap()
144   if (fflush(stdout) || ferror(stdout)) perror_exit("write");  in xflush()
163     if (out<1) perror_exit("write");  in xputsl()
185   if (EOF == fputc(c, stdout)) perror_exit("write");  in xputc()
195   if (pid == -1) perror_exit("vfork");  in xvforkwrap()
233     if (pipe(cestnepasun+(2*pid))) perror_exit("pipe");  in xpopen_both()
353   if (access(path, flags)) perror_exit("Can't access '%s'", path);  in xaccess()
359   if (unlink(path)) perror_exit("unlink '%s'", path);  in xunlink()
381   if (pipe(pp)) perror_exit("xpipe");  in xpipe()
386   if (close(fd)) perror_exit("xclose");  in xclose()
393     if (fd == -1) perror_exit("xdup");  in xdup()
417   if (rename(from, to)) perror_exit("rename %s -> %s", from, to);  in xrename()
460   if (!f) perror_exit("xfdopen");  in xfdopen()
469   if (!f) perror_exit("No file %s", path);  in xfopen()
477   if (ret < 0) perror_exit("xread");  in xread()
484   if (len != readall(fd, buf, len)) perror_exit("xreadall");  in xreadall()
493   if (len != writeall(fd, buf, len)) perror_exit("xwrite");  in xwrite()
501   if (offset<0) perror_exit("lseek");  in xlseek()
509   if (!buf) perror_exit("xgetcwd");  in xgetcwd()
516   if(stat(path, st)) perror_exit("Can't stat %s", path);  in xstat()
646   if (chdir(path)) perror_exit("chdir '%s'", path);  in xchdir()
666   if (!group) perror_exit("gid %ld", (long)gid);  in xgetgrgid()
702   if (!up) perror_exit("user '%s'", name);  in xgetpwnam()
710   if (!gr) perror_exit("group '%s'", name);  in xgetgrnam()
720       || setuid(pwd->pw_uid)) perror_exit("xsetuser '%s'", pwd->pw_name);  in xsetuser()
749   if (!(buf = readfile(name, buf, len))) perror_exit("Bad '%s'", name);  in xreadfile()
762   if (rc == -1 && errno) perror_exit("ioctl %x", request);  in xioctl()
861   if (errno) perror_exit("strtod %s", s);  in xstrtod()
926   if (new ? setenv("TZ", new, 1) : unsetenv("TZ")) perror_exit("setenv");  in xtzset()
941   if (sigaction(signal, sa, 0)) perror_exit("xsignal %d", signal);  in xsignal_flags()