Commit | Line | Data |
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61ec970d | 1 | /* Exim: OS-specific C header file for Linux */ |
f9ba5e22 | 2 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
9242a7e8 JH |
3 | /* See the file NOTICE for conditions of use and distribution. */ |
4 | ||
61ec970d | 5 | |
b87a6e0e PP |
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. */ | |
9d26b8c0 PP |
9 | |
10 | #include <features.h> | |
7d758a6a | 11 | #include <sys/types.h> |
9d26b8c0 PP |
12 | |
13 | ||
61ec970d PH |
14 | #define CRYPT_H |
15 | #define GLIBC_IP_OPTIONS | |
16 | #define HAVE_MMAP | |
6e2b4ccc | 17 | #define HAVE_BSD_GETLOADAVG |
26034054 | 18 | #define HAVE_SYS_STATVFS_H |
61ec970d | 19 | #define NO_IP_VAR_H |
61ec970d PH |
20 | #define SIG_IGN_WORKS |
21 | ||
7d758a6a | 22 | /* When using DKIM, setting OS_SENDFILE can increase |
80a47a2c TK |
23 | performance on outgoing mail a bit. Note: With older glibc versions |
24 | this setting will conflict with the _FILE_OFFSET_BITS=64 setting | |
eeb35890 JH |
25 | defined as part of the Linux CFLAGS. As of 2017 those are declared |
26 | to be too old to build by default. */ | |
2f43ad4a | 27 | |
7d758a6a JH |
28 | #define OS_SENDFILE |
29 | extern ssize_t os_sendfile(int, int, off_t *, size_t); | |
2f43ad4a | 30 | |
6e2b4ccc PH |
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__) | |
7d758a6a JH |
38 | # define SIOCGIFCONF_GIVES_ADDR |
39 | # define HAVE_SYS_MOUNT_H | |
6e2b4ccc PH |
40 | #endif |
41 | ||
42 | #if defined(__linux__) | |
43 | ||
61ec970d PH |
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 | ||
61ec970d PH |
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 | ||
6e2b4ccc PH |
61 | #endif /* __linux__ */ |
62 | ||
05ec18de PP |
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 | ||
10c50704 JH |
74 | #if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOUCE |
75 | # define EXIM_HAVE_OPENAT | |
76 | #endif | |
77 | ||
7d6ea1cd JH |
78 | /* TCP Fast Open support */ |
79 | ||
4c089965 JH |
80 | #include <netinet/tcp.h> /* for TCP_FASTOPEN */ |
81 | #include <sys/socket.h> /* for MSG_FASTOPEN */ | |
18f1b2f3 JH |
82 | #if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN) |
83 | # define MSG_FASTOPEN 0x20000000 | |
84 | #endif | |
1ccd5f67 | 85 | #define EXIM_HAVE_TCPI_UNACKED |
18f1b2f3 | 86 | |
05ec18de | 87 | |
61ec970d | 88 | /* End */ |