wta for range errors (ASSERT still needs work).
* error.c, error.h (scm_out_of_range): new procedure.
* error.c, error.h (scm_out_of_range_key): new key.
* posix.c (scm_sync): #else was missing.
* error.c, error.h: append _key to names scm_num_overflow and
scm_system_error.
* __scm.h (SCM_SYSMISSING, SCM_NUM_OVERFLOW): use SCM_BOOL_F instead
of consing an empty list.
(SCM_SYSERROR etc.): move into error.c, make them procedures instead
of macros, saves code and string space.
error.c, fports.c, numbers.c, posix.c, ioext.c, filesys.c, socket.c,
fdsocket.c, simpos.c: change names of SCM_SYSERROR etc., to
lower case. Rename scm_syserror_m to scm_syserror_msg.
error.h: prototypes for new procedures.
#define _POSIX_SOURCE before #including it.
* aclocal.m4 (GUILE_STRUCT_UTIMBUF): New test.
* acconfig.h: New comment text for above CPP symbol.
* configure.in: Call it.
* posix.c: #define _POSIX_SOURCE if it seems necessary.
* configure.in (AC_CHECK_HEADERS): Include sys/utime.h and utime.h
in the list.
* posix.c: Check HAVE_SYS_UTIME_H and HAVE_UTIME_H, instead of
testing for __EMX__.
* posix.c: #include <libc.h>, if it exists.
* posix.c: Cast the return result to GETGROUPS_T, not gid_t; we
don't even know if the latter exists.
* posix.c (s_sys_setpgid, s_sys_setsid, s_sys_ctermid,
s_sys_tcgetpgrp, s_sys_tcsetpgrp): Renamed from s_setpgid,
s_setsid, s_ctermid, s_tcgetpgrp, s_tcsetpgrp, for consistency.
* posix.c (R_OK, W_OK, X_OK, F_OK): #define these if the system's
header files don't.
(scm_init_posix): Use them when initializing the Scheme constants
of the same name.
symbols, when defining the scheme values R_OK, W_OK, X_OK, and F_OK.
The symbols aren't available on some systems, and I'm pretty sure
their values are fixed by common widespread practice.
* ioext.c (scm_init_ioext): Code here defined them too; remove it.
* configure.in (AC_CHECK_FUNCS): Add ctermid, setpgid, setsid,
tcgetpgrp, tcsetpgrp, and waitpid to the list of functions to
check for.
* configure, scmconfig.h.in: Updated, using autoconf and autoheader.
* posix.c (scm_sys_ctermid, scm_sys_setpgid, scm_sys_setsid,
scm_sys_tcgetpgrp, scm_sys_tcsetpgrp, scm_sys_waitpid): Put the
bodies of these functions in "#ifdef HAVE_MUMBLE" clauses, with a
stub that signals an error as the #else.
