+#if defined(MACH) && defined(i386)
+# define MACH386 1
+# define HASUNSETENV 1 /* has unsetenv(3) call */
+# define HASINITGROUPS 1 /* has initgroups(3) call */
+# ifndef HASFLOCK
+# define HASFLOCK 1 /* has flock(2) call */
+# endif
+# define NEEDGETOPT 1 /* need a replacement for getopt(3) */
+# define NEEDSTRTOL 1 /* need the strtol() function */
+# define setpgid setpgrp
+# ifndef LA_TYPE
+# define LA_TYPE LA_FLOAT
+# endif
+# define SFS_TYPE SFS_VFS /* use <sys/vfs.h> statfs() implementation */
+# undef HASSETVBUF /* don't actually have setvbuf(3) */
+# undef WEXITSTATUS
+# undef WIFEXITED
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef _PATH_SENDMAILPID
+# define _PATH_SENDMAILPID "/etc/sendmail.pid"
+# endif
+#endif
+
+
+/*
+** 4.3 BSD -- this is for very old systems
+**
+** Should work for mt Xinu MORE/BSD and Mips UMIPS-BSD 2.1.
+**
+** You'll also have to install a new resolver library.
+** I don't guarantee that support for this environment is complete.
+*/
+
+#if defined(oldBSD43) || defined(MORE_BSD) || defined(umipsbsd)
+# define NEEDVPRINTF 1 /* need a replacement for vprintf(3) */
+# define NEEDGETOPT 1 /* need a replacement for getopt(3) */
+# define ARBPTR_T char *
+# define setpgid setpgrp
+# ifndef LA_TYPE
+# define LA_TYPE LA_FLOAT
+# endif
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef IDENTPROTO
+# define IDENTPROTO 0 /* TCP/IP implementation is broken */
+# endif
+# undef WEXITSTATUS
+# undef WIFEXITED
+typedef short pid_t;
+extern int errno;
+#endif
+
+
+/*
+** SCO Unix
+**
+** This includes two parts -- the first is for SCO Open Server 3.2v4
+** (contributed by Philippe Brand <phb@colombo.telesys-innov.fr>).
+** The second is, I believe, for an older version.
+*/
+
+#ifdef _SCO_unix_4_2
+# define _SCO_unix_
+# define HASSETREUID 1 /* has setreuid(2) call */
+# define _PATH_UNIX "/unix"
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef _PATH_SENDMAILPID
+# define _PATH_SENDMAILPID "/etc/sendmail.pid"
+# endif
+#endif
+
+#ifdef _SCO_unix_
+# define SYSTEM5 1 /* include all the System V defines */
+# define SYS5SIGNALS 1 /* SysV signal semantics -- reset on each sig */
+# define HASGETUSERSHELL 0 /* does not have getusershell(3) call */
+# define FORK fork
+# define MAXPATHLEN PATHSIZE
+# define LA_TYPE LA_SHORT
+# define SFS_TYPE SFS_STATFS /* use <sys/statfs.h> statfs() impl */
+# undef NETUNIX /* no unix domain socket support */
+#endif
+
+
+/*
+** ConvexOS 11.0 and later
+**
+** "Todd C. Miller" <millert@mroe.cs.colorado.edu> claims this
+** works on 9.1 as well.
+*/
+
+#ifdef _CONVEX_SOURCE
+# define BSD 1 /* include all the BSD defines */
+# define HASUNAME 1 /* use System V uname(2) system call */
+# define HASSETSID 1 /* has POSIX setsid(2) call */
+# define NEEDGETOPT 1 /* need replacement for getopt(3) */
+# define LA_TYPE LA_FLOAT
+# define SFS_TYPE SFS_VFS /* use <sys/vfs.h> statfs() implementation */
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef S_IREAD
+# define S_IREAD _S_IREAD
+# define S_IWRITE _S_IWRITE
+# define S_IEXEC _S_IEXEC
+# define S_IFMT _S_IFMT
+# define S_IFCHR _S_IFCHR
+# define S_IFBLK _S_IFBLK
+# endif
+# ifndef IDENTPROTO
+# define IDENTPROTO 0 /* TCP/IP implementation is broken */
+# endif
+#endif
+
+
+/*
+** RISC/os 4.52
+**
+** Gives a ton of warning messages, but otherwise compiles.
+*/
+
+#ifdef RISCOS
+
+# define HASUNSETENV 1 /* has unsetenv(3) call */
+# ifndef HASFLOCK
+# define HASFLOCK 1 /* has flock(2) call */
+# endif
+# define WAITUNION 1 /* use "union wait" as wait argument type */
+# define NEEDGETOPT 1 /* need a replacement for getopt(3) */
+# define LA_TYPE LA_INT
+# define LA_AVENRUN "avenrun"
+# define _PATH_UNIX "/unix"
+# undef WIFEXITED
+
+# define setpgid setpgrp
+
+extern int errno;
+typedef int pid_t;
+#define SIGFUNC_DEFINED
+typedef int (*sigfunc_t)();
+extern char *getenv();
+extern void *malloc();
+
+#endif
+
+
+/*
+** Linux 0.99pl10 and above...
+**
+** Thanks to, in reverse order of contact:
+**
+** John Kennedy <warlock@csuchico.edu>
+** Florian La Roche <rzsfl@rz.uni-sb.de>
+** Karl London <karl@borg.demon.co.uk>
+**
+** Last compiled against: [03/02/94 @ 05:34 PM (Wednesday)]
+** sendmail 8.6.6.b9 named 4.9.2-931205-p1 db-1.73
+** gcc 2.5.8 libc.so.4.5.19
+** slackware 1.1.2 linux 0.99.15
+*/
+
+#ifdef __linux__
+# define BSD 1 /* include BSD defines */
+# define NEEDGETOPT 1 /* need a replacement for getopt(3) */
+# define HASUNAME 1 /* use System V uname(2) system call */
+# define HASUNSETENV 1 /* has unsetenv(3) call */
+# define ERRLIST_PREDEFINED /* don't declare sys_errlist */
+# define GIDSET_T gid_t /* from <linux/types.h> */
+# ifndef LA_TYPE
+# define LA_TYPE LA_PROCSTR
+# endif
+# define SFS_TYPE SFS_VFS /* use <sys/vfs.h> statfs() impl */
+# include <sys/sysmacros.h>
+# undef atol /* wounded in <stdlib.h> */
+#endif
+
+
+/*
+** DELL SVR4 Issue 2.2, and others
+** From Kimmo Suominen <kim@grendel.lut.fi>
+**
+** It's on #ifdef DELL_SVR4 because Solaris also gets __svr4__
+** defined, and the definitions conflict.
+**
+** Peter Wemm <peter@perth.DIALix.oz.au> claims that the setreuid
+** trick works on DELL 2.2 (SVR4.0/386 version 4.0) and ESIX 4.0.3A
+** (SVR4.0/386 version 3.0).
+*/
+
+#ifdef DELL_SVR4
+ /* no changes necessary */
+ /* see general __svr4__ defines below */
+#endif
+
+
+/*
+** Apple A/UX 3.0
+*/
+
+#ifdef _AUX_SOURCE
+# include <sys/sysmacros.h>
+# define BSD /* has BSD routines */
+# define HASUNAME 1 /* use System V uname(2) system call */
+# define HASSETVBUF 1 /* we have setvbuf(3) in libc */
+# define SIGFUNC_DEFINED /* sigfunc_t already defined */
+# ifndef IDENTPROTO
+# define IDENTPROTO 0 /* TCP/IP implementation is broken */
+# endif
+# define FORK fork
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef LA_TYPE
+# define LA_TYPE LA_ZERO
+# endif
+# define SFS_TYPE SFS_VFS /* use <sys/vfs.h> statfs() implementation */
+# undef WIFEXITED
+# undef WEXITSTATUS
+#endif
+
+
+/*
+** Encore UMAX V
+**
+** Not extensively tested.
+*/
+
+#ifdef UMAXV
+# include <limits.h>
+# define HASUNAME 1 /* use System V uname(2) system call */
+# define HASSETVBUF 1 /* we have setvbuf(3) in libc */
+# define HASINITGROUPS 1 /* has initgroups(3) call */
+# define HASGETUSERSHELL 0 /* does not have getusershell(3) call */
+# define SYS5SIGNALS 1 /* SysV signal semantics -- reset on each sig */
+# define SYS5SETPGRP 1 /* use System V setpgrp(2) syscall */
+# define FORK fork /* no vfork(2) primitive available */
+# define SFS_TYPE SFS_4ARGS /* four argument statfs() call */
+# define MAXPATHLEN PATH_MAX
+extern struct passwd *getpwent(), *getpwnam(), *getpwuid();
+extern struct group *getgrent(), *getgrnam(), *getgrgid();
+# undef WIFEXITED
+# undef WEXITSTATUS
+#endif
+
+
+/*
+** Stardent Titan 3000 running TitanOS 4.2.
+**
+** Must be compiled in "cc -43" mode.
+**
+** From Kate Hedstrom <kate@ahab.rutgers.edu>.
+**
+** Note the tweaking below after the BSD defines are set.
+*/
+
+#ifdef titan
+# define setpgid setpgrp
+typedef int pid_t;
+# undef WIFEXITED
+# undef WEXITSTATUS
+#endif
+
+
+/*
+** Sequent DYNIX 3.2.0
+**
+** From Jim Davis <jdavis@cs.arizona.edu>.
+*/
+
+#ifdef sequent
+
+# define BSD 1
+# define HASUNSETENV 1
+# define BSD4_3 1 /* to get signal() in conf.c */
+# define WAITUNION 1
+# define LA_TYPE LA_FLOAT
+# ifdef _POSIX_VERSION
+# undef _POSIX_VERSION /* set in <unistd.h> */
+# endif
+# undef HASSETVBUF /* don't actually have setvbuf(3) */
+# define setpgid setpgrp
+
+/* Have to redefine WIFEXITED to take an int, to work with waitfor() */
+# undef WIFEXITED
+# define WIFEXITED(s) (((union wait*)&(s))->w_stopval != WSTOPPED && \
+ ((union wait*)&(s))->w_termsig == 0)
+# define WEXITSTATUS(s) (((union wait*)&(s))->w_retcode)
+typedef int pid_t;
+# define isgraph(c) (isprint(c) && (c != ' '))
+
+# ifndef IDENTPROTO
+# define IDENTPROTO 0 /* TCP/IP implementation is broken */
+# endif
+
+# ifndef _PATH_UNIX
+# define _PATH_UNIX "/dynix"
+# endif
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+
+#endif
+
+
+/*
+** Sequent DYNIX/ptx v2.0 (and higher)
+**
+** For DYNIX/ptx v1.x, undefine HASSETREUID.
+**
+** From Tim Wright <timw@sequent.com>.
+*/
+
+#ifdef _SEQUENT_
+# define SYSTEM5 1 /* include all the System V defines */
+# define HASSETSID 1 /* has POSIX setsid(2) call */
+# define HASINITGROUPS 1 /* has initgroups(3) call */
+# define HASSETREUID 1 /* has setreuid(2) call */
+# define HASGETUSERSHELL 0 /* does not have getusershell(3) call */
+# define GIDSET_T gid_t
+# define LA_TYPE LA_INT
+# define SFS_TYPE SFS_STATFS /* use <sys/statfs.h> statfs() impl */
+# undef SETPROCTITLE
+# ifndef IDENTPROTO
+# define IDENTPROTO 0 /* TCP/IP implementation is broken */
+# endif
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef _PATH_SENDMAILPID
+# define _PATH_SENDMAILPID "/etc/sendmail.pid"
+# endif
+#endif
+
+
+/*
+** Cray Unicos
+**
+** Ported by David L. Kensiski, Sterling Sofware <kensiski@nas.nasa.gov>
+*/
+
+#ifdef UNICOS
+# define SYSTEM5 1 /* include all the System V defines */
+# define SYS5SIGNALS 1 /* SysV signal semantics -- reset on each sig */
+# define MAXPATHLEN PATHSIZE
+# define LA_TYPE LA_ZERO
+# define SFS_TYPE SFS_4ARGS /* four argument statfs() call */
+#endif
+
+
+/*
+** Apollo DomainOS
+**
+** From Todd Martin <tmartint@tus.ssi1.com> & Don Lewis <gdonl@gv.ssi1.com>
+**
+** 15 Jan 1994
+**
+*/
+
+#ifdef apollo
+# define HASSETREUID 1 /* has setreuid(2) call */
+# define HASINITGROUPS 1 /* has initgroups(2) call */
+# undef SETPROCTITLE
+# define LA_TYPE LA_SUBR /* use getloadavg.c */
+# define SFS_TYPE SFS_4ARGS /* four argument statfs() call */
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/lib/sendmail.cf"
+# endif
+# ifndef _PATH_SENDMAILPID
+# define _PATH_SENDMAILPID "/etc/sendmail.pid"
+# endif
+# undef S_IFSOCK /* S_IFSOCK and S_IFIFO are the same */
+# undef S_IFIFO
+# define S_IFIFO 0010000
+# ifndef IDENTPROTO
+# define IDENTPROTO 0 /* TCP/IP implementation is broken */
+# endif
+#endif
+
+
+
+
+/**********************************************************************
+** End of Per-Operating System defines
+**********************************************************************/
+
+/**********************************************************************
+** More general defines
+**********************************************************************/
+
+/* general BSD defines */
+#ifdef BSD
+# define HASGETDTABLESIZE 1 /* has getdtablesize(2) call */
+# define HASSETREUID 1 /* has setreuid(2) call */
+# define HASINITGROUPS 1 /* has initgroups(2) call */
+# ifndef HASFLOCK
+# define HASFLOCK 1 /* has flock(2) call */
+# endif
+#endif
+
+/* general System V Release 4 defines */
+#ifdef __svr4__
+# define SYSTEM5 1
+# define HASSETREUID 1 /* has seteuid(2) call & working saved uids */
+# ifndef HASGETUSERSHELL
+# define HASGETUSERSHELL 0 /* does not have getusershell(3) call */
+# endif
+# define setreuid(r, e) seteuid(e)
+
+# ifndef _PATH_UNIX
+# define _PATH_UNIX "/unix"
+# endif
+# ifndef _PATH_SENDMAILCF
+# define _PATH_SENDMAILCF "/usr/ucblib/sendmail.cf"
+# endif
+# ifndef _PATH_SENDMAILPID
+# define _PATH_SENDMAILPID "/usr/ucblib/sendmail.pid"
+# endif
+# ifndef SYSLOG_BUFSIZE
+# define SYSLOG_BUFSIZE 128
+# endif
+#endif
+
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