| 1 | /* Exim: OS-specific C header file for Linux */ |
| 2 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
| 3 | /* See the file NOTICE for conditions of use and distribution. */ |
| 4 | |
| 5 | |
| 6 | /* Some old systems we've received bug-reports for have a <limits.h> which |
| 7 | does not pull in <features.h>. Best to just pull it in now and have done |
| 8 | with the issue. */ |
| 9 | |
| 10 | #include <features.h> |
| 11 | #include <sys/types.h> |
| 12 | |
| 13 | |
| 14 | #define CRYPT_H |
| 15 | #define GLIBC_IP_OPTIONS |
| 16 | #define HAVE_MMAP |
| 17 | #define HAVE_BSD_GETLOADAVG |
| 18 | #define HAVE_SYS_STATVFS_H |
| 19 | #define NO_IP_VAR_H |
| 20 | #define SIG_IGN_WORKS |
| 21 | |
| 22 | /* When using DKIM, setting OS_SENDFILE can increase |
| 23 | performance on outgoing mail a bit. Note: With older glibc versions |
| 24 | this setting will conflict with the _FILE_OFFSET_BITS=64 setting |
| 25 | defined as part of the Linux CFLAGS. As of 2017 those are declared |
| 26 | to be too old to build by default. */ |
| 27 | |
| 28 | #define OS_SENDFILE |
| 29 | extern ssize_t os_sendfile(int, int, off_t *, size_t); |
| 30 | |
| 31 | #define F_FREESP O_TRUNC |
| 32 | typedef struct flock flock_t; |
| 33 | |
| 34 | #define os_strsignal strsignal |
| 35 | #define OS_STRSIGNAL |
| 36 | |
| 37 | #if defined(__linux__) || defined(__FreeBSD_kernel__) || defined(__NetBSD_kernel__) |
| 38 | # define SIOCGIFCONF_GIVES_ADDR |
| 39 | # define HAVE_SYS_MOUNT_H |
| 40 | #endif |
| 41 | |
| 42 | #if defined(__linux__) |
| 43 | |
| 44 | /* Some versions of Linux need explicit sync-ing of directories as well as |
| 45 | files. This setting requests that. If the directory is on NFS, it may not |
| 46 | be possible to sync it - in that case, Exim now should ignore the error. But |
| 47 | if you have problems in that area, try undefining this. But be aware that you |
| 48 | may be in a situation where files are not being properly "committed to stable |
| 49 | storage" as quickly as Exim thinks they are. */ |
| 50 | |
| 51 | #define NEED_SYNC_DIRECTORY |
| 52 | |
| 53 | #define os_find_running_interfaces os_find_running_interfaces_linux |
| 54 | |
| 55 | /* Need a prototype for the Linux-specific function. The structure hasn't |
| 56 | been defined yet, so we need to pre-declare it. */ |
| 57 | |
| 58 | struct ip_address_item; |
| 59 | extern struct ip_address_item *os_find_running_interfaces_linux(void); |
| 60 | |
| 61 | #endif /* __linux__ */ |
| 62 | |
| 63 | /* Some folks running "unusual" setups with very old libc environments have |
| 64 | found that _GNU_SOURCE=1 before <features.h> is not sufficient to define some |
| 65 | constants needed for 64-bit arithmetic. If you encounter build errors based |
| 66 | on LLONG_MIN being undefined and various other escape hatches have not helped, |
| 67 | then change the 0 to 1 in the next block. */ |
| 68 | |
| 69 | #if 0 |
| 70 | # define LLONG_MIN LONG_LONG_MIN |
| 71 | # define LLONG_MAX LONG_LONG_MAX |
| 72 | #endif |
| 73 | |
| 74 | #if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOUCE |
| 75 | # define EXIM_HAVE_OPENAT |
| 76 | #endif |
| 77 | |
| 78 | /* TCP Fast Open support */ |
| 79 | |
| 80 | #include <netinet/tcp.h> /* for TCP_FASTOPEN */ |
| 81 | #include <sys/socket.h> /* for MSG_FASTOPEN */ |
| 82 | #if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN) |
| 83 | # define MSG_FASTOPEN 0x20000000 |
| 84 | #endif |
| 85 | #define EXIM_HAVE_TCPI_UNACKED |
| 86 | #ifndef TCPI_OPT_SYN_DATA |
| 87 | # define TCPI_OPT_SYN_DATA 32 |
| 88 | #endif |
| 89 | |
| 90 | /* "Abstract" Unix-socket names */ |
| 91 | #define EXIM_HAVE_ABSTRACT_UNIX_SOCKETS |
| 92 | |
| 93 | |
| 94 | /* End */ |