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tclUnixPort.h

/*
 * tclUnixPort.h --
 *
 *    This header file handles porting issues that occur because
 *    of differences between systems.  It reads in UNIX-related
 *    header files and sets up UNIX-related macros for Tcl's UNIX
 *    core.  It should be the only file that contains #ifdefs to
 *    handle different flavors of UNIX.  This file sets up the
 *    union of all UNIX-related things needed by any of the Tcl
 *    core files.  This file depends on configuration #defines such
 *    as NO_DIRENT_H that are set up by the "configure" script.
 *
 *    Much of the material in this file was originally contributed
 *    by Karl Lehenbauer, Mark Diekhans and Peter da Silva.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclUnixPort.h,v 1.61 2007/12/13 15:28:42 dgp Exp $
 */

#ifndef _TCLUNIXPORT
#define _TCLUNIXPORT

/*
 *---------------------------------------------------------------------------
 * The following sets of #includes and #ifdefs are required to get Tcl to
 * compile under the various flavors of unix.
 *---------------------------------------------------------------------------
 */

#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_NET_ERRNO_H
#   include <net/errno.h>
#endif
#include <pwd.h>
#include <signal.h>
#ifdef HAVE_SYS_PARAM_H
#   include <sys/param.h>
#endif
#include <sys/types.h>
#ifdef USE_DIRENT2_H
#   include "../compat/dirent2.h"
#else
#ifdef NO_DIRENT_H
#   include "../compat/dirent.h"
#else
#   include <dirent.h>
#endif
#endif

#ifdef HAVE_STRUCT_DIRENT64
typedef struct dirent64 Tcl_DirEntry;
#   define TclOSreaddir       readdir64
#else
typedef struct dirent   Tcl_DirEntry;
#   define TclOSreaddir       readdir
#endif

#ifdef HAVE_TYPE_OFF64_T
typedef off64_t         Tcl_SeekOffset;
#   define TclOSseek          lseek64
#   define TclOSopen          open64
#else
typedef off_t           Tcl_SeekOffset;
#   define TclOSseek          lseek
#   define TclOSopen          open
#endif

#ifdef HAVE_STRUCT_STAT64
#   define TclOSstat          stat64
#   define TclOSlstat         lstat64
#else
#   define TclOSstat          stat
#   define TclOSlstat         lstat
#endif

#include <sys/file.h>
#ifdef HAVE_SYS_SELECT_H
#   include <sys/select.h>
#endif
#include <sys/stat.h>
#if TIME_WITH_SYS_TIME
#   include <sys/time.h>
#   include <time.h>
#else
#if HAVE_SYS_TIME_H
#   include <sys/time.h>
#else
#   include <time.h>
#endif
#endif
#ifndef NO_SYS_WAIT_H
#   include <sys/wait.h>
#endif
#if HAVE_INTTYPES_H
#   include <inttypes.h>
#endif
#if HAVE_STDINT_H
#   include <stdint.h>
#endif
#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#else
#   include "../compat/unistd.h"
#endif
#ifdef      USE_FIONBIO
    /*
     * Not using the Posix fcntl(...,O_NONBLOCK,...) interface, instead
     * we are using ioctl(..,FIONBIO,..).
     */

#   ifdef HAVE_SYS_FILIO_H
#     include     <sys/filio.h>     /* For FIONBIO. */
#   endif

#   ifdef HAVE_SYS_IOCTL_H
#     include     <sys/ioctl.h>     /* For FIONBIO. */
#   endif
#endif      /* USE_FIONBIO */
#include <utime.h>

/*
 * Socket support stuff: This likely needs more work to parameterize for
 * each system.
 */
#include <sys/socket.h>       /* struct sockaddr, SOCK_STREAM, ... */
#ifndef NO_UNAME
#   include <sys/utsname.h>   /* uname system call. */
#endif
#include <netinet/in.h>       /* struct in_addr, struct sockaddr_in */
#include <arpa/inet.h>        /* inet_ntoa() */
#include <netdb.h>            /* gethostbyname() */

/*
 * Some platforms (e.g. SunOS) don't define FLT_MAX and FLT_MIN, so we
 * look for an alternative definition.  If no other alternative is available
 * we use a reasonable guess.
 */

#ifndef NO_FLOAT_H
#   include <float.h>
#else
#ifndef NO_VALUES_H
#   include <values.h>
#endif
#endif

#ifndef FLT_MAX
#   ifdef MAXFLOAT
#     define FLT_MAX MAXFLOAT
#   else
#     define FLT_MAX 3.402823466E+38F
#   endif
#endif
#ifndef FLT_MIN
#   ifdef MINFLOAT
#     define FLT_MIN MINFLOAT
#   else
#     define FLT_MIN 1.175494351E-38F
#   endif
#endif

/*
 * NeXT doesn't define O_NONBLOCK, so #define it here if necessary.
 */

#ifndef O_NONBLOCK
#   define O_NONBLOCK 0x80
#endif

/*
 * HPUX needs the flag O_NONBLOCK to get the right non-blocking I/O
 * semantics, while most other systems need O_NDELAY.  Define the
 * constant NBIO_FLAG to be one of these
 */

#ifdef HPUX
#  define NBIO_FLAG O_NONBLOCK
#else
#  define NBIO_FLAG O_NDELAY
#endif

/*
 * The type of the status returned by wait varies from UNIX system
 * to UNIX system.  The macro below defines it:
 */

#ifdef _AIX
#   define WAIT_STATUS_TYPE pid_t
#else
#ifndef NO_UNION_WAIT
#   define WAIT_STATUS_TYPE union wait
#else
#   define WAIT_STATUS_TYPE int
#endif
#endif

/*
 * Supply definitions for macros to query wait status, if not already
 * defined in header files above.
 */

#ifndef WIFEXITED
#   define WIFEXITED(stat)  (((*((int *) &(stat))) & 0xff) == 0)
#endif

#ifndef WEXITSTATUS
#   define WEXITSTATUS(stat) (((*((int *) &(stat))) >> 8) & 0xff)
#endif

#ifndef WIFSIGNALED
#   define WIFSIGNALED(stat) (((*((int *) &(stat)))) && ((*((int *) &(stat))) == ((*((int *) &(stat))) & 0x00ff)))
#endif

#ifndef WTERMSIG
#   define WTERMSIG(stat)    ((*((int *) &(stat))) & 0x7f)
#endif

#ifndef WIFSTOPPED
#   define WIFSTOPPED(stat)  (((*((int *) &(stat))) & 0xff) == 0177)
#endif

#ifndef WSTOPSIG
#   define WSTOPSIG(stat)    (((*((int *) &(stat))) >> 8) & 0xff)
#endif

/*
 * Define constants for waitpid() system call if they aren't defined
 * by a system header file.
 */

#ifndef WNOHANG
#   define WNOHANG 1
#endif
#ifndef WUNTRACED
#   define WUNTRACED 2
#endif

/*
 * Supply macros for seek offsets, if they're not already provided by
 * an include file.
 */

#ifndef SEEK_SET
#   define SEEK_SET 0
#endif
#ifndef SEEK_CUR
#   define SEEK_CUR 1
#endif
#ifndef SEEK_END
#   define SEEK_END 2
#endif

/*
 * The stuff below is needed by the "time" command.  If this system has no
 * gettimeofday call, then must use times and the CLK_TCK #define (from
 * sys/param.h) to compute elapsed time.  Unfortunately, some systems only
 * have HZ and no CLK_TCK, and some might not even have HZ.
 */

#ifdef NO_GETTOD
#   include <sys/times.h>
#   include <sys/param.h>
#   ifndef CLK_TCK
#       ifdef HZ
#           define CLK_TCK HZ
#       else
#           define CLK_TCK 60
#       endif
#   endif
#else
#   ifdef HAVE_BSDGETTIMEOFDAY
#     define gettimeofday BSDgettimeofday
#   endif
#endif

#ifdef GETTOD_NOT_DECLARED
EXTERN int        gettimeofday _ANSI_ARGS_((struct timeval *tp,
                      struct timezone *tzp));
#endif

/*
 * Define access mode constants if they aren't already defined.
 */

#ifndef F_OK
#    define F_OK 00
#endif
#ifndef X_OK
#    define X_OK 01
#endif
#ifndef W_OK
#    define W_OK 02
#endif
#ifndef R_OK
#    define R_OK 04
#endif

/*
 * Define FD_CLOEEXEC (the close-on-exec flag bit) if it isn't
 * already defined.
 */

#ifndef FD_CLOEXEC
#   define FD_CLOEXEC 1
#endif

/*
 * On systems without symbolic links (i.e. S_IFLNK isn't defined)
 * define "lstat" to use "stat" instead.
 */

#ifndef S_IFLNK
#   undef TclOSlstat
#   define lstat  stat
#   define lstat64      stat64
#   define TclOSlstat   TclOSstat
#endif

/*
 * Define macros to query file type bits, if they're not already
 * defined.
 */

#ifndef S_ISREG
#   ifdef S_IFREG
#       define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#   else
#       define S_ISREG(m) 0
#   endif
#endif /* !S_ISREG */
#ifndef S_ISDIR
#   ifdef S_IFDIR
#       define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#   else
#       define S_ISDIR(m) 0
#   endif
#endif /* !S_ISDIR */
#ifndef S_ISCHR
#   ifdef S_IFCHR
#       define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
#   else
#       define S_ISCHR(m) 0
#   endif
#endif /* !S_ISCHR */
#ifndef S_ISBLK
#   ifdef S_IFBLK
#       define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#   else
#       define S_ISBLK(m) 0
#   endif
#endif /* !S_ISBLK */
#ifndef S_ISFIFO
#   ifdef S_IFIFO
#       define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
#   else
#       define S_ISFIFO(m) 0
#   endif
#endif /* !S_ISFIFO */
#ifndef S_ISLNK
#   ifdef S_IFLNK
#       define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
#   else
#       define S_ISLNK(m) 0
#   endif
#endif /* !S_ISLNK */
#ifndef S_ISSOCK
#   ifdef S_IFSOCK
#       define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
#   else
#       define S_ISSOCK(m) 0
#   endif
#endif /* !S_ISSOCK */

/*
 * Make sure that MAXPATHLEN and MAXNAMLEN are defined.
 */

#ifndef MAXPATHLEN
#   ifdef PATH_MAX
#       define MAXPATHLEN PATH_MAX
#   else
#       define MAXPATHLEN 2048
#   endif
#endif

#ifndef MAXNAMLEN
#   ifdef NAME_MAX
#     define MAXNAMLEN NAME_MAX
#   else
#     define MAXNAMLEN 255
#   endif
#endif

/*
 * Make sure that L_tmpnam is defined.
 */

#ifndef L_tmpnam
#   define L_tmpnam 100
#endif

/*
 * The following macro defines the type of the mask arguments to
 * select:
 */

#ifndef NO_FD_SET
#   define SELECT_MASK fd_set
#else /* NO_FD_SET */
#   ifndef _AIX
      typedef long fd_mask;
#   endif /* !AIX */
#   if defined(_IBMR2)
#     define SELECT_MASK void
#   else /* !defined(_IBMR2) */
#     define SELECT_MASK int
#   endif /* defined(_IBMR2) */
#endif /* !NO_FD_SET */

/*
 * Define "NBBY" (number of bits per byte) if it's not already defined.
 */

#ifndef NBBY
#   define NBBY 8
#endif

/*
 * The following macro defines the number of fd_masks in an fd_set:
 */

#ifndef FD_SETSIZE
#   ifdef OPEN_MAX
#     define FD_SETSIZE OPEN_MAX
#   else
#     define FD_SETSIZE 256
#   endif
#endif /* FD_SETSIZE */
#if !defined(howmany)
#   define howmany(x, y) (((x)+((y)-1))/(y))
#endif /* !defined(howmany) */
#ifndef NFDBITS
#   define NFDBITS NBBY*sizeof(fd_mask)
#endif /* NFDBITS */
#define MASK_SIZE howmany(FD_SETSIZE, NFDBITS)

/*
 * Not all systems declare the errno variable in errno.h. so this
 * file does it explicitly.  The list of system error messages also
 * isn't generally declared in a header file anywhere.
 */

#ifdef NO_ERRNO
extern int errno;
#endif /* NO_ERRNO */

/*
 * Not all systems declare all the errors that Tcl uses!  Provide some
 * work-arounds...
 */

#ifndef EOVERFLOW
#   ifdef EFBIG
#     define EOVERFLOW EFBIG
#   else /* !EFBIG */
#     define EOVERFLOW EINVAL
#   endif /* EFBIG */
#endif /* EOVERFLOW */

/*
 * Variables provided by the C library:
 */

#if defined(__APPLE__) && defined(__DYNAMIC__)
#   include <crt_externs.h>
#   define environ (*_NSGetEnviron())
#   define USE_PUTENV 1
#else
#   if defined(_sgi) || defined(__sgi)
#       define environ _environ
#   endif
extern char **environ;
#endif

/*
 * At present (12/91) not all stdlib.h implementations declare strtod.
 * The declaration below is here to ensure that it's declared, so that
 * the compiler won't take the default approach of assuming it returns
 * an int.  There's no ANSI prototype for it because there would end
 * up being too many conflicts with slightly-different prototypes.
 */

#ifdef NO_STDLIB_H
extern double strtod();
#endif

/*
 * There is no platform-specific panic routine for Unix in the Tcl internals.
 */

#define TclpPanic ((Tcl_PanicProc *) NULL)

/*
 * Darwin specifc configure overrides.
 */

#ifdef __APPLE__
/*
 * Support for fat compiles: configure runs only once for multiple architectures
 */
#   if defined(__LP64__) && defined (NO_COREFOUNDATION_64)
#       undef HAVE_COREFOUNDATION
#    endif /* __LP64__ && NO_COREFOUNDATION_64 */
#   include <sys/cdefs.h>
#   ifdef __DARWIN_UNIX03
#       if __DARWIN_UNIX03
#           undef HAVE_PUTENV_THAT_COPIES
#       else
#           define HAVE_PUTENV_THAT_COPIES 1
#       endif
#   endif /* __DARWIN_UNIX03 */
/*
 * The termios configure test program relies on the configure script being run
 * from a terminal, which is not the case e.g. when configuring from Xcode.
 * Since termios is known to be present on all Mac OS X releases since 10.0,
 * override the configure defines for serial API here. [Bug 497147]
 */
#   define USE_TERMIOS 1
#   undef  USE_TERMIO
#   undef  USE_SGTTY
/*
 * Include AvailabilityMacros.h here (when available) to ensure any symbolic
 * MAC_OS_X_VERSION_* constants passed on the command line are translated.
 */
#   ifdef HAVE_AVAILABILITYMACROS_H
#       include <AvailabilityMacros.h>
#   endif
/*
 * Support for weak import.
 */
#   ifdef HAVE_WEAK_IMPORT
#       if !defined(HAVE_AVAILABILITYMACROS_H) || !defined(MAC_OS_X_VERSION_MIN_REQUIRED)
#           undef HAVE_WEAK_IMPORT
#       else
#           ifndef WEAK_IMPORT_ATTRIBUTE
#               define WEAK_IMPORT_ATTRIBUTE __attribute__((weak_import))
#           endif
#       endif
#   endif /* HAVE_WEAK_IMPORT */
/*
 * Support for MAC_OS_X_VERSION_MAX_ALLOWED define from AvailabilityMacros.h:
 * only use API available in the indicated OS version or earlier.
 */
#   ifdef MAC_OS_X_VERSION_MAX_ALLOWED
#       if MAC_OS_X_VERSION_MAX_ALLOWED < 1050 && defined(__LP64__)
#           undef HAVE_COREFOUNDATION
#       endif
#       if MAC_OS_X_VERSION_MAX_ALLOWED < 1040
#           undef HAVE_OSSPINLOCKLOCK
#           undef HAVE_PTHREAD_ATFORK
#           undef HAVE_COPYFILE
#       endif
#       if MAC_OS_X_VERSION_MAX_ALLOWED < 1030
#           ifdef TCL_THREADS
            /* prior to 10.3, realpath is not threadsafe, c.f. bug 711232 */
#               define NO_REALPATH 1
#           endif
#           undef HAVE_LANGINFO
#       endif
#   endif /* MAC_OS_X_VERSION_MAX_ALLOWED */
#   if defined(HAVE_COREFOUNDATION) && defined(__LP64__) && \
          defined(HAVE_WEAK_IMPORT) && MAC_OS_X_VERSION_MIN_REQUIRED < 1050
#       warning "Weak import of 64-bit CoreFoundation is not supported, will not run on Mac OS X < 10.5."
#   endif
/*
 * At present, using vfork() instead of fork() causes execve() to fail
 * intermittently on Darwin x86_64. rdar://4685553
 */
#   if defined(__x86_64__) && !defined(FIXED_RDAR_4685553)
#       undef USE_VFORK
#   endif /* __x86_64__ */
#endif /* __APPLE__ */

/*
 *---------------------------------------------------------------------------
 * The following macros and declarations represent the interface between 
 * generic and unix-specific parts of Tcl.  Some of the macros may override 
 * functions declared in tclInt.h.
 *---------------------------------------------------------------------------
 */

/*
 * The default platform eol translation on Unix is TCL_TRANSLATE_LF.
 */

#ifdef DJGPP
#define     TCL_PLATFORM_TRANSLATION      TCL_TRANSLATE_CRLF
typedef int socklen_t;
#else
#define     TCL_PLATFORM_TRANSLATION      TCL_TRANSLATE_LF
#endif

/*
 * The following macros have trivial definitions, allowing generic code to 
 * address platform-specific issues.
 */

#define TclpGetPid(pid)       ((unsigned long) (pid))
#define TclpReleaseFile(file) /* Nothing. */

/*
 * The following defines wrap the system memory allocation routines.
 */

#define TclpSysAlloc(size, isBin)   malloc((size_t)size)
#define TclpSysFree(ptr)            free((char*)ptr)
#define TclpSysRealloc(ptr, size)   realloc((char*)ptr, (size_t)size)

/*
 * The following macros and declaration wrap the C runtime library
 * functions.
 */

#define TclpExit        exit

#ifdef TCL_THREADS
EXTERN struct tm *      TclpLocaltime(CONST time_t *);
EXTERN struct tm *      TclpGmtime(CONST time_t *);
EXTERN char *           TclpInetNtoa(struct in_addr);
/* #define localtime(x) TclpLocaltime(x)
 * #define gmtime(x)    TclpGmtime(x)    */
#   undef inet_ntoa
#   define inet_ntoa(x) TclpInetNtoa(x)
#   ifdef HAVE_PTHREAD_ATTR_GET_NP
#     define TclpPthreadGetAttrs    pthread_attr_get_np
#     ifdef ATTRGETNP_NOT_DECLARED
/*
 * Assume it is in pthread_np.h if it isn't in pthread.h. [Bug 1064882]
 * We might need to revisit this in the future. :^(
 */
#         include <pthread.h>
#         include <pthread_np.h>
#     endif
#   else
#     ifdef HAVE_PTHREAD_GETATTR_NP
#         define TclpPthreadGetAttrs      pthread_getattr_np
#         ifdef GETATTRNP_NOT_DECLARED
EXTERN int pthread_getattr_np _ANSI_ARGS_((pthread_t, pthread_attr_t *));
#         endif
#     endif /* HAVE_PTHREAD_GETATTR_NP */
#   endif /* HAVE_PTHREAD_ATTR_GET_NP */
#endif /* TCL_THREADS */

/*
 * Set of MT-safe implementations of some
 * known-to-be-MT-unsafe library calls.
 * Instead of returning pointers to the
 * static storage, those return pointers
 * to the TSD data. 
 */

#include <pwd.h>
#include <grp.h>

#ifndef MODULE_SCOPE
#define MODULE_SCOPE extern
#endif

MODULE_SCOPE struct passwd*  TclpGetPwNam(const char *name);
MODULE_SCOPE struct group*   TclpGetGrNam(const char *name);
MODULE_SCOPE struct passwd*  TclpGetPwUid(uid_t uid);
MODULE_SCOPE struct group*   TclpGetGrGid(gid_t gid);
MODULE_SCOPE struct hostent* TclpGetHostByName(const char *name);
MODULE_SCOPE struct hostent* TclpGetHostByAddr(const char *addr, int length, int type);

#endif /* _TCLUNIXPORT */

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