122   if (fflush(stdout) || ferror(stdout)) perror_exit("write");  in xprintf()
127   if (EOF == puts(s) || fflush(stdout) || ferror(stdout)) perror_exit("write");  in xputs()
133     perror_exit("write");  in xputc()
138   if (fflush(stdout) || ferror(stdout)) perror_exit("write");;  in xflush()
147   if (pid == -1) perror_exit("vfork");  in xvforkwrap()
184       if (pipe(cestnepasun+(2*pid))) perror_exit("pipe");  in xpopen_both()
290   if (access(path, flags)) perror_exit("Can't access '%s'", path);  in xaccess()
296   if (unlink(path)) perror_exit("unlink '%s'", path);  in xunlink()
315   if (pipe(pp)) perror_exit("xpipe");  in xpipe()
320   if (close(fd)) perror_exit("xclose");  in xclose()
327     if (fd == -1) perror_exit("xdup");  in xdup()
336   if (!f) perror_exit("xfdopen");  in xfdopen()
345   if (!f) perror_exit("No file %s", path);  in xfopen()
353   if (ret < 0) perror_exit("xread");  in xread()
360   if (len != readall(fd, buf, len)) perror_exit("xreadall");  in xreadall()
369   if (len != writeall(fd, buf, len)) perror_exit("xwrite");  in xwrite()
377   if (offset<0) perror_exit("lseek");  in xlseek()
385   if (!buf) perror_exit("xgetcwd");  in xgetcwd()
392   if(stat(path, st)) perror_exit("Can't stat %s", path);  in xstat()
532   if (!group) perror_exit("gid %ld", (long)gid);  in xgetgrgid()
547   if (!up) perror_exit("user '%s'", user);  in xgetpwnamid()
563   if (!gr) perror_exit("group '%s'", group);  in xgetgrnamid()
572   if (!up) perror_exit("user '%s'", name);  in xgetpwnam()
580   if (!gr) perror_exit("group '%s'", name);  in xgetgrnam()
590       || setuid(pwd->pw_uid)) perror_exit("xsetuser '%s'", pwd->pw_name);  in xsetuser()
619   if (!(buf = readfile(name, buf, len))) perror_exit("Bad '%s'", name);  in xreadfile()
630   if (rc == -1 && errno) perror_exit("ioctl %x", request);  in xioctl()
724   if (new ? setenv("TZ", new, 1) : unsetenv("TZ")) perror_exit("setenv");  in xtzset()
738   if (sigaction(signal, sa, 0)) perror_exit("xsignal %d", signal);  in xsignal()