src/OS/os.h-Linux

   1 /* Exim: OS-specific C header file for Linux */
   2
   3 /* Some old systems we've received bug-reports for have a <limits.h> which
   4 does not pull in <features.h>.  Best to just pull it in now and have done
   5 with the issue. */
   6
   7 #include <features.h>
   8
   9
  10 #define CRYPT_H
  11 #define GLIBC_IP_OPTIONS
  12 #define HAVE_MMAP
  13 #define HAVE_BSD_GETLOADAVG
  14 #define HAVE_SYS_STATVFS_H
  15 #define NO_IP_VAR_H
  16 #define SIG_IGN_WORKS
  17
  18 /* When using the DKIM, setting HAVE_LINUX_SENDFILE can increase
  19 performance on outgoing mail a bit. Note: With older glibc versions
  20 this setting will conflict with the _FILE_OFFSET_BITS=64 setting
  21 defined as part of the Linux CFLAGS. */
  22
  23 /* #define HAVE_LINUX_SENDFILE */
  24
  25 #define F_FREESP     O_TRUNC
  26 typedef struct flock flock_t;
  27
  28 #define os_strsignal strsignal
  29 #define OS_STRSIGNAL
  30
  31 #if defined(__linux__) || defined(__FreeBSD_kernel__) || defined(__NetBSD_kernel__)
  32 #define SIOCGIFCONF_GIVES_ADDR
  33 #define HAVE_SYS_MOUNT_H
  34 #endif
  35
  36 #if defined(__linux__)
  37
  38 /* Some versions of Linux need explicit sync-ing of directories as well as
  39 files. This setting requests that. If the directory is on NFS, it may not
  40 be possible to sync it - in that case, Exim now should ignore the error. But
  41 if you have problems in that area, try undefining this. But be aware that you
  42 may be in a situation where files are not being properly "committed to stable
  43 storage" as quickly as Exim thinks they are. */
  44
  45 #define NEED_SYNC_DIRECTORY
  46
  47 #define os_find_running_interfaces os_find_running_interfaces_linux
  48
  49 /* Need a prototype for the Linux-specific function. The structure hasn't
  50 been defined yet, so we need to pre-declare it. */
  51
  52 struct ip_address_item;
  53 extern struct ip_address_item *os_find_running_interfaces_linux(void);
  54
  55 #endif /* __linux__ */
  56
  57 /* Some folks running "unusual" setups with very old libc environments have
  58 found that _GNU_SOURCE=1 before <features.h> is not sufficient to define some
  59 constants needed for 64-bit arithmetic.  If you encounter build errors based
  60 on LLONG_MIN being undefined and various other escape hatches have not helped,
  61 then change the 0 to 1 in the next block. */
  62
  63 #if 0
  64 # define LLONG_MIN LONG_LONG_MIN
  65 # define LLONG_MAX LONG_LONG_MAX
  66 #endif
  67
  68 #if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOUCE
  69 # define EXIM_HAVE_OPENAT
  70 #endif
  71
  72 #include <netinet/tcp.h>        /* for TCP_FASTOPEN */
  73 #include <sys/socket.h>         /* for MSG_FASTOPEN */
  74 #if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN)
  75 # define MSG_FASTOPEN 0x20000000
  76 #endif
  77
  78
  79 /* End */