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Diffstat (limited to 'OS/os.h-Linux')
| -rw-r--r-- | OS/os.h-Linux | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/OS/os.h-Linux b/OS/os.h-Linux new file mode 100644 index 0000000..e6a8d28 --- /dev/null +++ b/OS/os.h-Linux @@ -0,0 +1,104 @@ +/* Exim: OS-specific C header file for Linux */ +/* Copyright (c) University of Cambridge 1995 - 2020 */ +/* Copyright (c) The Exim Maintainers 2021 */ +/* See the file NOTICE for conditions of use and distribution. */ + + +/* Some old systems we've received bug-reports for have a <limits.h> which +does not pull in <features.h>. Best to just pull it in now and have done +with the issue. */ + +#include <features.h> +#include <sys/types.h> + + +#define CRYPT_H +#define GLIBC_IP_OPTIONS +#define HAVE_MMAP +#define HAVE_BSD_GETLOADAVG +#define HAVE_SYS_STATVFS_H +#define HAVE_GETIFADDRS +#define NO_IP_VAR_H +#define SIG_IGN_WORKS + +/* When using DKIM, setting OS_SENDFILE can increase +performance on outgoing mail a bit. Note: With older glibc versions +this setting will conflict with the _FILE_OFFSET_BITS=64 setting +defined as part of the Linux CFLAGS. As of 2017 those are declared +to be too old to build by default. */ + +#define OS_SENDFILE +extern ssize_t os_sendfile(int, int, off_t *, size_t); + +#define F_FREESP O_TRUNC +typedef struct flock flock_t; + +#define os_strsignal strsignal +#define OS_STRSIGNAL + +#if defined(__linux__) || defined(__FreeBSD_kernel__) || defined(__NetBSD_kernel__) +# define SIOCGIFCONF_GIVES_ADDR +# define HAVE_SYS_MOUNT_H +#endif + +#if defined(__linux__) + +/* Some versions of Linux need explicit sync-ing of directories as well as +files. This setting requests that. If the directory is on NFS, it may not +be possible to sync it - in that case, Exim now should ignore the error. But +if you have problems in that area, try undefining this. But be aware that you +may be in a situation where files are not being properly "committed to stable +storage" as quickly as Exim thinks they are. */ + +#define NEED_SYNC_DIRECTORY + +#define os_find_running_interfaces os_find_running_interfaces_linux + +/* Need a prototype for the Linux-specific function. The structure hasn't +been defined yet, so we need to pre-declare it. */ + +struct ip_address_item; +extern struct ip_address_item *os_find_running_interfaces_linux(void); + +#endif /* __linux__ */ + +/* Some folks running "unusual" setups with very old libc environments have +found that _GNU_SOURCE=1 before <features.h> is not sufficient to define some +constants needed for 64-bit arithmetic. If you encounter build errors based +on LLONG_MIN being undefined and various other escape hatches have not helped, +then change the 0 to 1 in the next block. */ + +#if 0 +# define LLONG_MIN LONG_LONG_MIN +# define LLONG_MAX LONG_LONG_MAX +#endif + +#if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOURCE +# define EXIM_HAVE_OPENAT +# define EXIM_HAVE_FUTIMENS +#endif + +/* TCP Fast Open support */ + +#include <netinet/tcp.h> /* for TCP_FASTOPEN */ +#include <sys/socket.h> /* for MSG_FASTOPEN */ +#if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN) +# define MSG_FASTOPEN 0x20000000 +#endif +#define EXIM_HAVE_TCPI_UNACKED +#ifndef TCPI_OPT_SYN_DATA +# define TCPI_OPT_SYN_DATA 32 +#endif + +/* "Abstract" Unix-socket names */ +#define EXIM_HAVE_ABSTRACT_UNIX_SOCKETS + +/* inotify(7) etc syscalls */ +#define EXIM_HAVE_INOTIFY + +/* Needed for uClibc */ +#ifndef NS_MAXMSG +# define NS_MAXMSG 65535 +#endif + +/* End */ |