git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 48d12f14c9c0fc8cf943b52774c3892517dd72d4 Mon Sep 17 00:00:00 2001
   2 From: Simon Kelley <simon@thekelleys.org.uk>
   3 Date: Fri, 2 Nov 2018 21:55:04 +0000
   4 Subject: [PATCH 10/32] Remove the NO_FORK compile-time option, and support for
   5  uclinux.
   6
   7 In an era where everything has an MMU, this looks like
   8 an anachronism, and it adds to (Ok, multiplies!) the
   9 combinatorial explosion of compile-time options.
  10
  11 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
  12 ---
  13  CHANGELOG     |  6 ++++++
  14  src/config.h  | 21 ++-------------------
  15  src/dnsmasq.c | 14 --------------
  16  src/option.c  |  4 +---
  17  4 files changed, 9 insertions(+), 36 deletions(-)
  18
  19 --- a/CHANGELOG
  20 +++ b/CHANGELOG
  21 @@ -11,6 +11,12 @@ version 2.81
  22         This fix passes cache entries back from the TCP child process to
  23         the main server process, and fixes the problem.
  24
  25 +       Remove the NO_FORK compile-time option, and support for uclinux.
  26 +       In an era where everything has an MMU, this looks like
  27 +       an anachronism, and it adds to (Ok, multiplies!) the
  28 +       combinatorial explosion of compile-time options. Thanks to
  29 +       Kevin Darbyshire-Bryant for the patch.
  30 +
  31
  32  version 2.80
  33         Add support for RFC 4039 DHCP rapid commit. Thanks to Ashram Method
  34 --- a/src/config.h
  35 +++ b/src/config.h
  36 @@ -239,27 +239,13 @@ HAVE_SOCKADDR_SA_LEN
  37     defined if struct sockaddr has sa_len field (*BSD)
  38  */
  39
  40 -/* Must precede __linux__ since uClinux defines __linux__ too. */
  41 -#if defined(__uClinux__)
  42 -#define HAVE_LINUX_NETWORK
  43 -#define HAVE_GETOPT_LONG
  44 -#undef HAVE_SOCKADDR_SA_LEN
  45 -/* Never use fork() on uClinux. Note that this is subtly different from the
  46 -   --keep-in-foreground option, since it also  suppresses forking new
  47 -   processes for TCP connections and disables the call-a-script on leasechange
  48 -   system. It's intended for use on MMU-less kernels. */
  49 -#define NO_FORK
  50 -
  51 -#elif defined(__UCLIBC__)
  52 +#if defined(__UCLIBC__)
  53  #define HAVE_LINUX_NETWORK
  54  #if defined(__UCLIBC_HAS_GNU_GETOPT__) || \
  55     ((__UCLIBC_MAJOR__==0) && (__UCLIBC_MINOR__==9) && (__UCLIBC_SUBLEVEL__<21))
  56  #    define HAVE_GETOPT_LONG
  57  #endif
  58  #undef HAVE_SOCKADDR_SA_LEN
  59 -#if !defined(__ARCH_HAS_MMU__) && !defined(__UCLIBC_HAS_MMU__)
  60 -#  define NO_FORK
  61 -#endif
  62  #if defined(__UCLIBC_HAS_IPV6__)
  63  #  ifndef IPV6_V6ONLY
  64  #    define IPV6_V6ONLY 26
  65 @@ -328,7 +314,7 @@ HAVE_SOCKADDR_SA_LEN
  66  #define HAVE_DHCP
  67  #endif
  68
  69 -#if defined(NO_SCRIPT) || defined(NO_FORK)
  70 +#if defined(NO_SCRIPT)
  71  #undef HAVE_SCRIPT
  72  #undef HAVE_LUASCRIPT
  73  #endif
  74 @@ -372,9 +358,6 @@ static char *compile_opts =
  75  #ifdef HAVE_BROKEN_RTC
  76  "no-RTC "
  77  #endif
  78 -#ifdef NO_FORK
  79 -"no-MMU "
  80 -#endif
  81  #ifndef HAVE_DBUS
  82  "no-"
  83  #endif
  84 --- a/src/dnsmasq.c
  85 +++ b/src/dnsmasq.c
  86 @@ -485,7 +485,6 @@ int main (int argc, char **argv)
  87        if (chdir("/") != 0)
  88         die(_("cannot chdir to filesystem root: %s"), NULL, EC_MISC);
  89
  90 -#ifndef NO_FORK
  91        if (!option_bool(OPT_NO_FORK))
  92         {
  93           pid_t pid;
  94 @@ -525,7 +524,6 @@ int main (int argc, char **argv)
  95           if (pid != 0)
  96             _exit(0);
  97         }
  98 -#endif
  99
 100        /* write pidfile _after_ forking ! */
 101        if (daemon->runfile)
 102 @@ -1628,12 +1626,10 @@ static int set_dns_listeners(time_t now)
 103
 104      }
 105
 106 -#ifndef NO_FORK
 107    if (!option_bool(OPT_DEBUG))
 108      for (i = 0; i < MAX_PROCS; i++)
 109        if (daemon->tcp_pipes[i] != -1)
 110         poll_listen(daemon->tcp_pipes[i], POLLIN);
 111 -#endif
 112
 113    return wait;
 114  }
 115 @@ -1643,9 +1639,7 @@ static void check_dns_listeners(time_t n
 116    struct serverfd *serverfdp;
 117    struct listener *listener;
 118    int i;
 119 -#ifndef NO_FORK
 120    int pipefd[2];
 121 -#endif
 122
 123    for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next)
 124      if (poll_check(serverfdp->fd, POLLIN))
 125 @@ -1657,7 +1651,6 @@ static void check_dns_listeners(time_t n
 126           poll_check(daemon->randomsocks[i].fd, POLLIN))
 127         reply_query(daemon->randomsocks[i].fd, daemon->randomsocks[i].family, now);
 128
 129 -#ifndef NO_FORK
 130    /* Races. The child process can die before we read all of the data from the
 131       pipe, or vice versa. Therefore send tcp_pids to zero when we wait() the
 132       process, and tcp_pipes to -1 and close the FD when we read the last
 133 @@ -1674,7 +1667,6 @@ static void check_dns_listeners(time_t n
 134           close(daemon->tcp_pipes[i]);
 135           daemon->tcp_pipes[i] = -1;
 136         }
 137 -#endif
 138
 139    for (listener = daemon->listeners; listener; listener = listener->next)
 140      {
 141 @@ -1768,7 +1760,6 @@ static void check_dns_listeners(time_t n
 142               shutdown(confd, SHUT_RDWR);
 143               while (retry_send(close(confd)));
 144             }
 145 -#ifndef NO_FORK
 146           else if (!option_bool(OPT_DEBUG) && pipe(pipefd) == 0 && (p = fork()) != 0)
 147             {
 148               close(pipefd[1]); /* parent needs read pipe end. */
 149 @@ -1791,7 +1782,6 @@ static void check_dns_listeners(time_t n
 150               /* The child can use up to TCP_MAX_QUERIES ids, so skip that many. */
 151               daemon->log_id += TCP_MAX_QUERIES;
 152             }
 153 -#endif
 154           else
 155             {
 156               unsigned char *buff;
 157 @@ -1811,7 +1801,6 @@ static void check_dns_listeners(time_t n
 158                   auth_dns = 0;
 159                 }
 160
 161 -#ifndef NO_FORK
 162               /* Arrange for SIGALRM after CHILD_LIFETIME seconds to
 163                  terminate the process. */
 164               if (!option_bool(OPT_DEBUG))
 165 @@ -1820,7 +1809,6 @@ static void check_dns_listeners(time_t n
 166                   close(pipefd[0]); /* close read end in child. */
 167                   daemon->pipe_to_parent = pipefd[1];
 168                 }
 169 -#endif
 170
 171               /* start with no upstream connections. */
 172               for (s = daemon->servers; s; s = s->next)
 173 @@ -1846,13 +1834,11 @@ static void check_dns_listeners(time_t n
 174                     shutdown(s->tcpfd, SHUT_RDWR);
 175                     while (retry_send(close(s->tcpfd)));
 176                   }
 177 -#ifndef NO_FORK
 178               if (!option_bool(OPT_DEBUG))
 179                 {
 180                   flush_log();
 181                   _exit(0);
 182                 }
 183 -#endif
 184             }
 185         }
 186      }
 187 --- a/src/option.c
 188 +++ b/src/option.c
 189 @@ -1828,9 +1828,7 @@ static int one_opt(int option, char *arg
 190        /* Sorry about the gross pre-processor abuse */
 191      case '6':             /* --dhcp-script */
 192      case LOPT_LUASCRIPT:  /* --dhcp-luascript */
 193 -#  if defined(NO_FORK)
 194 -      ret_err(_("cannot run scripts under uClinux"));
 195 -#  elif !defined(HAVE_SCRIPT)
 196 +#  if !defined(HAVE_SCRIPT)
 197        ret_err(_("recompile with HAVE_SCRIPT defined to enable lease-change scripts"));
 198  #  else
 199        if (option == LOPT_LUASCRIPT)