This commit was manufactured by cvs2svn to create branch 'cygwin-1-1-4'.github/cygwin-1-1-4 cygwin-1-1-4

Sprout from master 2000-07-28 22:33:43 UTC Christopher Faylor <me@cgf.cx> '* dcrt0.cc (dummy_autoload): Add load statement for RegDeleteValueA.' Delete: COPYING COPYING.LIB ChangeLog MAINTAINERS Makefile.in README README-maintainer-mode config-ml.in config.guess config.if config.sub config/ChangeLog config/acinclude.m4 config/mh-a68bsd config/mh-aix386 config/mh-apollo68 config/mh-armpic config/mh-cxux config/mh-cygwin config/mh-decstation config/mh-delta88 config/mh-dgux config/mh-dgux386 config/mh-djgpp config/mh-elfalphapic config/mh-hp300 config/mh-hpux config/mh-hpux8 config/mh-i370pic config/mh-ia64pic config/mh-interix config/mh-irix4 config/mh-irix5 config/mh-irix6 config/mh-lynxos config/mh-lynxrs6k config/mh-m68kpic config/mh-mingw32 config/mh-ncr3000 config/mh-ncrsvr43 config/mh-necv4 config/mh-openedition config/mh-papic config/mh-ppcpic config/mh-riscos config/mh-sco config/mh-solaris config/mh-sparcpic config/mh-sun3 config/mh-sysv config/mh-sysv4 config/mh-sysv5 config/mh-vaxult2 config/mh-x86pic config/mpw-mh-mpw config/mpw/ChangeLog config/mpw/MoveIfChange config/mpw/README config/mpw/forward-include 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include/mpw/fcntl.h include/mpw/grp.h include/mpw/mpw.h include/mpw/pwd.h include/mpw/spin.h include/mpw/stat.h include/mpw/sys/file.h include/mpw/sys/param.h include/mpw/sys/resource.h include/mpw/sys/stat.h include/mpw/sys/time.h include/mpw/sys/types.h include/mpw/utime.h include/mpw/varargs.h include/nlm/ChangeLog include/nlm/alpha-ext.h include/nlm/common.h include/nlm/external.h include/nlm/i386-ext.h include/nlm/internal.h include/nlm/ppc-ext.h include/nlm/sparc32-ext.h include/oasys.h include/objalloc.h include/obstack.h include/opcode/ChangeLog include/opcode/a29k.h include/opcode/alpha.h include/opcode/arc.h include/opcode/arm.h include/opcode/avr.h include/opcode/cgen.h include/opcode/convex.h include/opcode/cris.h include/opcode/d10v.h include/opcode/d30v.h include/opcode/h8300.h include/opcode/hppa.h include/opcode/i370.h include/opcode/i386.h include/opcode/i860.h include/opcode/i960.h include/opcode/ia64.h include/opcode/m68hc11.h include/opcode/m68k.h 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libgloss/m68k/leds.c libgloss/m68k/leds.h libgloss/m68k/mc68681reg.h libgloss/m68k/mc68ec.c libgloss/m68k/mvme-stub.c libgloss/m68k/mvme.S libgloss/m68k/mvme135-asm.S libgloss/m68k/mvme135.ld libgloss/m68k/mvme162.ld libgloss/m68k/mvme162lx-asm.S libgloss/m68k/sbc5204.ld libgloss/m68k/sbc5206.ld libgloss/m68k/test.c libgloss/mcore/Makefile.in libgloss/mcore/close.c libgloss/mcore/cmb-exit.c libgloss/mcore/cmb-inbyte.c libgloss/mcore/cmb-outbyte.c libgloss/mcore/configure libgloss/mcore/configure.in libgloss/mcore/crt0.S libgloss/mcore/elf-cmb.ld libgloss/mcore/elf-cmb.specs libgloss/mcore/fstat.c libgloss/mcore/getpid.c libgloss/mcore/kill.c libgloss/mcore/lseek.c libgloss/mcore/open.c libgloss/mcore/pe-cmb.ld libgloss/mcore/pe-cmb.specs libgloss/mcore/print.c libgloss/mcore/putnum.c libgloss/mcore/raise.c libgloss/mcore/read.c libgloss/mcore/sbrk.c libgloss/mcore/stat.c libgloss/mcore/syscalls.S libgloss/mcore/unlink.c libgloss/mcore/write.c libgloss/mips/Makefile.in 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newlib/libc/include/fcntl.h newlib/libc/include/grp.h newlib/libc/include/ieeefp.h newlib/libc/include/locale.h newlib/libc/include/machine/fastmath.h newlib/libc/include/machine/ieeefp.h newlib/libc/include/machine/setjmp-dj.h newlib/libc/include/machine/setjmp.h newlib/libc/include/machine/time.h newlib/libc/include/machine/types.h newlib/libc/include/malloc.h newlib/libc/include/math.h newlib/libc/include/paths.h newlib/libc/include/process.h newlib/libc/include/pwd.h newlib/libc/include/reent.h newlib/libc/include/regdef.h newlib/libc/include/setjmp.h newlib/libc/include/signal.h newlib/libc/include/stdio.h newlib/libc/include/stdlib.h newlib/libc/include/string.h newlib/libc/include/sys/_types.h newlib/libc/include/sys/config.h newlib/libc/include/sys/dirent.h newlib/libc/include/sys/errno.h newlib/libc/include/sys/fcntl.h newlib/libc/include/sys/file.h newlib/libc/include/sys/param.h newlib/libc/include/sys/reent.h newlib/libc/include/sys/resource.h newlib/libc/include/sys/signal.h newlib/libc/include/sys/stat-dj.h newlib/libc/include/sys/stat.h newlib/libc/include/sys/time.h newlib/libc/include/sys/timeb.h newlib/libc/include/sys/times.h newlib/libc/include/sys/types.h newlib/libc/include/sys/unistd.h newlib/libc/include/sys/utime.h newlib/libc/include/sys/wait.h newlib/libc/include/termios.h newlib/libc/include/time.h newlib/libc/include/unctrl.h newlib/libc/include/unistd.h newlib/libc/include/utime.h newlib/libc/include/utmp.h newlib/libc/libc.texinfo newlib/libc/locale/Makefile.am newlib/libc/locale/Makefile.in newlib/libc/locale/locale.c newlib/libc/locale/locale.tex newlib/libc/machine/Makefile.am newlib/libc/machine/Makefile.in newlib/libc/machine/a29k/Makefile.am newlib/libc/machine/a29k/Makefile.in newlib/libc/machine/a29k/aclocal.m4 newlib/libc/machine/a29k/configure newlib/libc/machine/a29k/configure.in newlib/libc/machine/aclocal.m4 newlib/libc/machine/arm/Makefile.am newlib/libc/machine/arm/Makefile.in newlib/libc/machine/arm/aclocal.m4 newlib/libc/machine/arm/configure newlib/libc/machine/arm/configure.in newlib/libc/machine/configure newlib/libc/machine/configure.in newlib/libc/machine/d10v/Makefile.am newlib/libc/machine/d10v/Makefile.in newlib/libc/machine/d10v/aclocal.m4 newlib/libc/machine/d10v/configure newlib/libc/machine/d10v/configure.in newlib/libc/machine/d10v/setjmp.S newlib/libc/machine/d30v/Makefile.am newlib/libc/machine/d30v/Makefile.in newlib/libc/machine/d30v/aclocal.m4 newlib/libc/machine/d30v/configure newlib/libc/machine/d30v/configure.in newlib/libc/machine/d30v/setjmp.S newlib/libc/machine/fr30/Makefile.am newlib/libc/machine/fr30/Makefile.in newlib/libc/machine/fr30/aclocal.m4 newlib/libc/machine/fr30/configure newlib/libc/machine/fr30/configure.in newlib/libc/machine/fr30/setjmp.S newlib/libc/machine/h8300/Makefile.am newlib/libc/machine/h8300/Makefile.in newlib/libc/machine/h8300/aclocal.m4 newlib/libc/machine/h8300/configure newlib/libc/machine/h8300/configure.in newlib/libc/machine/h8300/defines.h newlib/libc/machine/h8300/memcpy.S newlib/libc/machine/h8300/memset.S newlib/libc/machine/h8300/reg_memcpy.S newlib/libc/machine/h8300/reg_memset.S newlib/libc/machine/h8300/setjmp.S newlib/libc/machine/h8300/strcmp.S newlib/libc/machine/h8500/Makefile.am newlib/libc/machine/h8500/Makefile.in newlib/libc/machine/h8500/aclocal.m4 newlib/libc/machine/h8500/cmpsi.c newlib/libc/machine/h8500/configure newlib/libc/machine/h8500/configure.in newlib/libc/machine/h8500/divhi3.S newlib/libc/machine/h8500/divsi3.c newlib/libc/machine/h8500/mulhi3.c newlib/libc/machine/h8500/mulsi3.c newlib/libc/machine/h8500/negsi2.c newlib/libc/machine/h8500/psi.S newlib/libc/machine/h8500/setjmp.S newlib/libc/machine/h8500/shifts.c newlib/libc/machine/hppa/DEFS.h newlib/libc/machine/hppa/Makefile.am newlib/libc/machine/hppa/Makefile.in newlib/libc/machine/hppa/aclocal.m4 newlib/libc/machine/hppa/configure newlib/libc/machine/hppa/configure.in newlib/libc/machine/hppa/memchr.S newlib/libc/machine/hppa/memcmp.S newlib/libc/machine/hppa/memcpy.S newlib/libc/machine/hppa/memset.S newlib/libc/machine/hppa/pcc_prefix.s newlib/libc/machine/hppa/setjmp.S newlib/libc/machine/hppa/strcat.S newlib/libc/machine/hppa/strcmp.S newlib/libc/machine/hppa/strcpy.S newlib/libc/machine/hppa/strlen.S newlib/libc/machine/hppa/strncat.S newlib/libc/machine/hppa/strncmp.S newlib/libc/machine/hppa/strncpy.S newlib/libc/machine/i386/Makefile.am newlib/libc/machine/i386/Makefile.in newlib/libc/machine/i386/aclocal.m4 newlib/libc/machine/i386/configure newlib/libc/machine/i386/configure.in newlib/libc/machine/i386/f_atan2.S newlib/libc/machine/i386/f_atan2f.S newlib/libc/machine/i386/f_exp.c newlib/libc/machine/i386/f_expf.c newlib/libc/machine/i386/f_frexp.S newlib/libc/machine/i386/f_frexpf.S newlib/libc/machine/i386/f_ldexp.S newlib/libc/machine/i386/f_ldexpf.S newlib/libc/machine/i386/f_log.S newlib/libc/machine/i386/f_log10.S newlib/libc/machine/i386/f_log10f.S newlib/libc/machine/i386/f_logf.S newlib/libc/machine/i386/f_math.h newlib/libc/machine/i386/f_pow.c newlib/libc/machine/i386/f_powf.c newlib/libc/machine/i386/f_tan.S newlib/libc/machine/i386/f_tanf.S newlib/libc/machine/i386/i386mach.h newlib/libc/machine/i386/memchr.S newlib/libc/machine/i386/memcmp.S newlib/libc/machine/i386/memcpy.S newlib/libc/machine/i386/memmove.S newlib/libc/machine/i386/memset.S newlib/libc/machine/i386/setjmp.S newlib/libc/machine/i386/strchr.S newlib/libc/machine/i386/strlen.S newlib/libc/machine/i960/Makefile.am newlib/libc/machine/i960/Makefile.in newlib/libc/machine/i960/aclocal.m4 newlib/libc/machine/i960/configure newlib/libc/machine/i960/configure.in newlib/libc/machine/i960/memccpy.S newlib/libc/machine/i960/memccpy_ca.S newlib/libc/machine/i960/memchr.S newlib/libc/machine/i960/memchr_ca.S newlib/libc/machine/i960/memcmp.S newlib/libc/machine/i960/memcmp_ca.S 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newlib/libc/machine/m68k/Makefile.am newlib/libc/machine/m68k/Makefile.in newlib/libc/machine/m68k/aclocal.m4 newlib/libc/machine/m68k/configure newlib/libc/machine/m68k/configure.in newlib/libc/machine/m68k/setjmp.S newlib/libc/machine/m68k/strcpy.c newlib/libc/machine/m68k/strlen.c newlib/libc/machine/m88k/Makefile.am newlib/libc/machine/m88k/Makefile.in newlib/libc/machine/m88k/aclocal.m4 newlib/libc/machine/m88k/configure newlib/libc/machine/m88k/configure.in newlib/libc/machine/m88k/setjmp.S newlib/libc/machine/mips/Makefile.am newlib/libc/machine/mips/Makefile.in newlib/libc/machine/mips/aclocal.m4 newlib/libc/machine/mips/configure newlib/libc/machine/mips/configure.in newlib/libc/machine/mips/machine/regdef.h newlib/libc/machine/mips/setjmp.S newlib/libc/machine/mn10200/Makefile.am newlib/libc/machine/mn10200/Makefile.in newlib/libc/machine/mn10200/aclocal.m4 newlib/libc/machine/mn10200/configure newlib/libc/machine/mn10200/configure.in newlib/libc/machine/mn10200/setjmp.S newlib/libc/machine/mn10300/Makefile.am newlib/libc/machine/mn10300/Makefile.in newlib/libc/machine/mn10300/aclocal.m4 newlib/libc/machine/mn10300/configure newlib/libc/machine/mn10300/configure.in newlib/libc/machine/mn10300/memchr.S newlib/libc/machine/mn10300/memcmp.S newlib/libc/machine/mn10300/memcpy.S newlib/libc/machine/mn10300/memset.S newlib/libc/machine/mn10300/setjmp.S newlib/libc/machine/mn10300/strchr.S newlib/libc/machine/mn10300/strcmp.S newlib/libc/machine/mn10300/strcpy.S newlib/libc/machine/mn10300/strlen.S newlib/libc/machine/necv70/Makefile.am newlib/libc/machine/necv70/Makefile.in newlib/libc/machine/necv70/aclocal.m4 newlib/libc/machine/necv70/configure newlib/libc/machine/necv70/configure.in newlib/libc/machine/necv70/fastmath.s newlib/libc/machine/necv70/machine/registers.h newlib/libc/machine/necv70/necv70.tex newlib/libc/machine/necv70/setjmp.s newlib/libc/machine/powerpc/Makefile.am newlib/libc/machine/powerpc/Makefile.in newlib/libc/machine/powerpc/aclocal.m4 newlib/libc/machine/powerpc/configure newlib/libc/machine/powerpc/configure.in newlib/libc/machine/powerpc/setjmp.S newlib/libc/machine/sh/Makefile.am newlib/libc/machine/sh/Makefile.in newlib/libc/machine/sh/aclocal.m4 newlib/libc/machine/sh/asm.h newlib/libc/machine/sh/configure newlib/libc/machine/sh/configure.in newlib/libc/machine/sh/memcpy.S newlib/libc/machine/sh/memset.S newlib/libc/machine/sh/setjmp.S newlib/libc/machine/sh/strcmp.S newlib/libc/machine/sh/strcpy.S newlib/libc/machine/sparc/Makefile.am newlib/libc/machine/sparc/Makefile.in newlib/libc/machine/sparc/aclocal.m4 newlib/libc/machine/sparc/configure newlib/libc/machine/sparc/configure.in newlib/libc/machine/sparc/machine/sparclet.h newlib/libc/machine/sparc/scan.c newlib/libc/machine/sparc/setjmp.S newlib/libc/machine/sparc/shuffle.c newlib/libc/machine/tic80/Makefile.am newlib/libc/machine/tic80/Makefile.in newlib/libc/machine/tic80/aclocal.m4 newlib/libc/machine/tic80/configure newlib/libc/machine/tic80/configure.in newlib/libc/machine/tic80/setjmp.S newlib/libc/machine/v850/Makefile.am newlib/libc/machine/v850/Makefile.in newlib/libc/machine/v850/aclocal.m4 newlib/libc/machine/v850/configure newlib/libc/machine/v850/configure.in newlib/libc/machine/v850/setjmp.S newlib/libc/machine/w65/Makefile.am newlib/libc/machine/w65/Makefile.in newlib/libc/machine/w65/aclocal.m4 newlib/libc/machine/w65/cmpsi.c newlib/libc/machine/w65/configure newlib/libc/machine/w65/configure.in newlib/libc/machine/w65/divsi3.c newlib/libc/machine/w65/lshrhi.s newlib/libc/machine/w65/mulsi3.c newlib/libc/machine/w65/sdivhi3.s newlib/libc/machine/w65/smulhi3.s newlib/libc/machine/w65/udivhi3.s newlib/libc/machine/w65/umodhi3.s newlib/libc/machine/z8k/Makefile.am newlib/libc/machine/z8k/Makefile.in newlib/libc/machine/z8k/aclocal.m4 newlib/libc/machine/z8k/args.h newlib/libc/machine/z8k/configure newlib/libc/machine/z8k/configure.in newlib/libc/machine/z8k/setjmp.S newlib/libc/misc/Makefile.am newlib/libc/misc/Makefile.in newlib/libc/misc/dprintf.c newlib/libc/misc/ffs.c newlib/libc/misc/misc.tex newlib/libc/misc/unctrl.c newlib/libc/posix/Makefile.am newlib/libc/posix/Makefile.in newlib/libc/posix/closedir.c newlib/libc/posix/creat.c newlib/libc/posix/execl.c newlib/libc/posix/execle.c newlib/libc/posix/execlp.c newlib/libc/posix/execv.c newlib/libc/posix/execve.c newlib/libc/posix/execvp.c newlib/libc/posix/isatty.c newlib/libc/posix/opendir.c newlib/libc/posix/popen.c newlib/libc/posix/readdir.c newlib/libc/posix/rewinddir.c newlib/libc/posix/scandir.c newlib/libc/posix/seekdir.c newlib/libc/posix/telldir.c newlib/libc/reent/Makefile.am newlib/libc/reent/Makefile.in newlib/libc/reent/closer.c newlib/libc/reent/execr.c newlib/libc/reent/fstatr.c newlib/libc/reent/impure.c newlib/libc/reent/linkr.c newlib/libc/reent/lseekr.c newlib/libc/reent/openr.c newlib/libc/reent/readr.c newlib/libc/reent/reent.c 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newlib/libc/stdio/fseek.c newlib/libc/stdio/fsetpos.c newlib/libc/stdio/ftell.c newlib/libc/stdio/fvwrite.c newlib/libc/stdio/fvwrite.h newlib/libc/stdio/fwalk.c newlib/libc/stdio/fwrite.c newlib/libc/stdio/getc.c newlib/libc/stdio/getchar.c newlib/libc/stdio/gets.c newlib/libc/stdio/getw.c newlib/libc/stdio/iprintf.c newlib/libc/stdio/local.h newlib/libc/stdio/makebuf.c newlib/libc/stdio/mktemp.c newlib/libc/stdio/perror.c newlib/libc/stdio/printf.c newlib/libc/stdio/putc.c newlib/libc/stdio/putchar.c newlib/libc/stdio/puts.c newlib/libc/stdio/putw.c newlib/libc/stdio/refill.c newlib/libc/stdio/remove.c newlib/libc/stdio/rename.c newlib/libc/stdio/rewind.c newlib/libc/stdio/rget.c newlib/libc/stdio/scanf.c newlib/libc/stdio/setbuf.c newlib/libc/stdio/setvbuf.c newlib/libc/stdio/siprintf.c newlib/libc/stdio/snprintf.c newlib/libc/stdio/sprintf.c newlib/libc/stdio/sscanf.c newlib/libc/stdio/stdio.c newlib/libc/stdio/stdio.tex newlib/libc/stdio/tmpfile.c newlib/libc/stdio/tmpnam.c newlib/libc/stdio/ungetc.c newlib/libc/stdio/vfieeefp.h newlib/libc/stdio/vfprintf.c newlib/libc/stdio/vfscanf.c newlib/libc/stdio/vprintf.c newlib/libc/stdio/vsnprintf.c newlib/libc/stdio/vsprintf.c newlib/libc/stdio/wbuf.c newlib/libc/stdio/wsetup.c newlib/libc/stdlib/Makefile.am newlib/libc/stdlib/Makefile.in newlib/libc/stdlib/__adjust.c newlib/libc/stdlib/__exp10.c newlib/libc/stdlib/__ten_mu.c newlib/libc/stdlib/abort.c newlib/libc/stdlib/abs.c newlib/libc/stdlib/assert.c newlib/libc/stdlib/atexit.c newlib/libc/stdlib/atexit.h newlib/libc/stdlib/atof.c newlib/libc/stdlib/atoff.c newlib/libc/stdlib/atoi.c newlib/libc/stdlib/atol.c newlib/libc/stdlib/bsearch.c newlib/libc/stdlib/calloc.c newlib/libc/stdlib/div.c newlib/libc/stdlib/dtoa.c newlib/libc/stdlib/dtoastub.c newlib/libc/stdlib/ecvtbuf.c newlib/libc/stdlib/efgcvt.c newlib/libc/stdlib/environ.c newlib/libc/stdlib/envlock.c newlib/libc/stdlib/envlock.h newlib/libc/stdlib/eprintf.c newlib/libc/stdlib/exit.c newlib/libc/stdlib/getenv.c newlib/libc/stdlib/getenv_r.c newlib/libc/stdlib/getopt.c newlib/libc/stdlib/labs.c newlib/libc/stdlib/ldiv.c newlib/libc/stdlib/local.h newlib/libc/stdlib/malign.c newlib/libc/stdlib/malloc.c newlib/libc/stdlib/mallocr.c newlib/libc/stdlib/mbctype.h newlib/libc/stdlib/mblen.c newlib/libc/stdlib/mblen_r.c newlib/libc/stdlib/mbstowcs.c newlib/libc/stdlib/mbstowcs_r.c newlib/libc/stdlib/mbtowc.c newlib/libc/stdlib/mbtowc_r.c newlib/libc/stdlib/mlock.c newlib/libc/stdlib/mprec.c newlib/libc/stdlib/mprec.h newlib/libc/stdlib/msize.c newlib/libc/stdlib/mstats.c newlib/libc/stdlib/mtrim.c newlib/libc/stdlib/putenv.c newlib/libc/stdlib/putenv_r.c newlib/libc/stdlib/qsort.c newlib/libc/stdlib/rand.c newlib/libc/stdlib/rand_r.c newlib/libc/stdlib/realloc.c newlib/libc/stdlib/setenv.c newlib/libc/stdlib/setenv_r.c newlib/libc/stdlib/std.h newlib/libc/stdlib/stdlib.tex newlib/libc/stdlib/strdup.c newlib/libc/stdlib/strdup_r.c newlib/libc/stdlib/strtod.c newlib/libc/stdlib/strtol.c newlib/libc/stdlib/strtoul.c newlib/libc/stdlib/system.c newlib/libc/stdlib/valloc.c newlib/libc/stdlib/wcstombs.c newlib/libc/stdlib/wcstombs_r.c newlib/libc/stdlib/wctomb.c newlib/libc/stdlib/wctomb_r.c newlib/libc/string/Makefile.am newlib/libc/string/Makefile.in newlib/libc/string/bcmp.c newlib/libc/string/bcopy.c newlib/libc/string/bzero.c newlib/libc/string/index.c newlib/libc/string/memchr.c newlib/libc/string/memcmp.c newlib/libc/string/memcpy.c newlib/libc/string/memmove.c newlib/libc/string/memset.c newlib/libc/string/rindex.c newlib/libc/string/strcasecmp.c newlib/libc/string/strcat.c newlib/libc/string/strchr.c newlib/libc/string/strcmp.c newlib/libc/string/strcoll.c newlib/libc/string/strcpy.c newlib/libc/string/strcspn.c newlib/libc/string/strerror.c newlib/libc/string/strings.tex newlib/libc/string/strlen.c newlib/libc/string/strlwr.c newlib/libc/string/strncasecmp.c newlib/libc/string/strncat.c newlib/libc/string/strncmp.c 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author: cvs2svn <> 2000-07-28 22:33:44 +0000
committer: cvs2svn <> 2000-07-28 22:33:44 +0000
commit: 074f88429327b287c95d145e30fe0f940c357231 (patch)
tree: 894be5500c7e4d9aa7661f82fb3cb8a3746cf0ef /winsup/doc/overview2.sgml
parent: 637f5ce0fecddfb14d8f0b6a12d791fac469ad84 (diff)
download: newlib-github/cygwin-1-1-4.zip
newlib-github/cygwin-1-1-4.tar.gz
newlib-github/cygwin-1-1-4.tar.bz2
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-<sect1 id="ov-ex-unix"><title>Expectations for UNIX Programmers</title>
-
-<para>Developers coming from a UNIX background will find a set of utilities
-they are already comfortable using, including a working UNIX shell.  The
-compiler tools are the standard GNU compilers most people will have previously
-used under UNIX, only ported to the Windows host.  Programmers wishing to port
-UNIX software to Windows NT or 9x will find that the Cygwin library provides
-an easy way to port many UNIX packages, with only minimal source code
-changes.</para>
-</sect1>
-
-<sect1 id="ov-ex-win"><title>Expectations for Windows Programmers</title>
-<para>Developers coming from a Windows background will find a set of tools capable
-of writing console or GUI executables that rely on the Microsoft Win32 API.
-The linker and dlltool utility may be used to write Windows Dynamically Linked
-Libraries (DLLs).  The resource compiler "windres" is also provided with the
-native Windows GNUPro tools.  All tools may be used from the Microsoft command
-line prompt, with full support for normal Windows pathnames.</para>
-</sect1>
-
-<sect2 id="ov-hi-intro"><title>Introduction</title> <para>When a binary linked
-against the library is executed, the Cygwin DLL is loaded into the
-application's text segment.  Because we are trying to emulate a UNIX kernel
-which needs access to all processes running under it, the first Cygwin DLL to
-run creates shared memory areas that other processes using separate instances
-of the DLL can access.  This is used to keep track of open file descriptors and
-assist fork and exec, among other purposes.  In addition to the shared memory
-regions, every process also has a per_process structure that contains
-information such as process id, user id, signal masks, and other similar
-process-specific information.</para>
-
-<para>The DLL is implemented using the Win32 API, which allows it to run on all
-Win32 hosts.  Because processes run under the standard Win32 subsystem, they
-can access both the UNIX compatibility calls provided by Cygwin as well as
-any of the Win32 API calls.  This gives the programmer complete flexibility in
-designing the structure of their program in terms of the APIs used.  For
-example, they could write a Win32-specific GUI using Win32 API calls on top of
-a UNIX back-end that uses Cygwin.</para>
-
-<para>Early on in the development process, we made the important design
-decision that it would not be necessary to strictly adhere to existing UNIX
-standards like POSIX.1 if it was not possible or if it would significantly
-diminish the usability of the tools on the Win32 platform.  In many cases, an
-environment variable can be set to override the default behavior and force
-standards compliance.</para>
-</sect2>
-
-<sect2 id="ov-hi-win9xnt"><title>Supporting both Windows NT and 9x</title>
-<para>While Windows 95 and Windows 98 are similar enough to each other that we
-can safely ignore the distinction when implementing Cygwin, Windows NT is an
-extremely different operating system.  For this reason, whenever the DLL is
-loaded, the library checks which operating system is active so that it can act
-accordingly.</para>
-
-<para>In some cases, the Win32 API is only different for
-historical reasons.  In this situation, the same basic functionality is
-available under Windows 9x and NT but the method used to gain this
-functionality differs.  A trivial example: in our implementation of
-uname, the library examines the sysinfo.dwProcessorType structure
-member to figure out the processor type under Windows 9x.  This field
-is not supported in NT, which has its own operating system-specific
-structure member called sysinfo.wProcessorLevel.</para>
-
-<para>Other differences between NT and 9x are much more fundamental in
-nature.  The best example is that only NT provides a security model.</para>
-</sect2>
-
-<sect2 id="ov-hi-perm"><title>Permissions and Security</title>
-<para>Windows NT includes a sophisticated security model based on Access
-Control Lists (ACLs).  Cygwin maps Win32 file ownership and permissions to the
-more standard, older UNIX model by default.  Cygwin version 1.1 introduces
-support for ACLs according to the system calls used on newer versions of
-Solaris. This ability is used when the `ntsec' feature is switched on which
-is described in another chapter.
-The chmod call maps UNIX-style permissions
-back to the Win32 equivalents.  Because many programs expect to be able to find
-the /etc/passwd and /etc/group files, we provide utilities that can be used to
-construct them from the user and group information provided by the operating
-system.</para>
-
-<para>Under Windows NT, the administrator is permitted to chown files.  There
-is no mechanism to support the setuid concept or API call since Cygwin version
-1.1.2.  With version 1.1.3 Cygwin introduces a mechanism for setting real
-and effective UIDs under Windows NT/W2K. This is described in the ntsec
-section.</para>
-
-<para>Under Windows 9x, the situation is considerably different.  Since a
-security model is not provided, Cygwin fakes file ownership by making all
-files look like they are owned by a default user and group id.  As under NT,
-file permissions can still be determined by examining their read/write/execute
-status.  Rather than return an unimplemented error, under Windows 9x, the
-chown call succeeds immediately without actually performing any action
-whatsoever.  This is appropriate since essentially all users jointly own the
-files when no concept of file ownership exists.</para>
-
-<para>It is important that we discuss the implications of our "kernel" using
-shared memory areas to store information about Cygwin processes.  Because
-these areas are not yet protected in any way, in principle a malicious user
-could modify them to cause unexpected behavior in Cygwin processes.  While
-this is not a new problem under Windows 9x (because of the lack of operating
-system security), it does constitute a security hole under Windows NT.
-This is because one user could affect the Cygwin programs run by
-another user by changing the shared memory information in ways that
-they could not in a more typical WinNT program.  For this reason, it
-is not appropriate to use Cygwin in high-security applications.  In
-practice, this will not be a major problem for most uses of the
-library.</para>
-</sect2>
-
-<sect2 id="ov-hi-files"><title>File Access</title> <para>Cygwin supports
-both Win32- and POSIX-style paths, using either forward or back slashes as the
-directory delimiter.  Paths coming into the DLL are translated from Win32 to
-POSIX as needed.  As a result, the library believes that the file system is a
-POSIX-compliant one, translating paths back to Win32 paths whenever it calls a
-Win32 API function.  UNC pathnames (starting with two slashes) are
-supported.</para>
-
-<para>The layout of this POSIX view of the Windows file system space is stored
-in the Windows registry.  While the slash ('/') directory points to the system
-partition by default, this is easy to change with the Cygwin mount utility.
-In addition to selecting the slash partition, it allows mounting arbitrary
-Win32 paths into the POSIX file system space.  Many people use the utility to
-mount each drive letter under the slash partition (e.g. C:\ to /c, D:\ to /d,
-etc...).</para>
-
-<para>The library exports several Cygwin-specific functions that can be used
-by external programs to convert a path or path list from Win32 to POSIX or vice
-versa.  Shell scripts and Makefiles cannot call these functions directly.
-Instead, they can do the same path translations by executing the cygpath
-utility program that we provide with Cygwin.</para>
-
-<para>Win32 file systems are case preserving but case insensitive.  Cygwin
-does not currently support case distinction because, in practice, few UNIX
-programs actually rely on it.  While we could mangle file names to support case
-distinction, this would add unnecessary overhead to the library and make it
-more difficult for non-Cygwin applications to access those files.</para>
-
-<para>Symbolic links are emulated by files containing a magic cookie followed
-by the path to which the link points.  They are marked with the System
-attribute so that only files with that attribute have to be read to determine
-whether or not the file is a symbolic link.  Hard links are fully supported
-under Windows NT on NTFS file systems.  On a FAT file system, the call falls
-back to simply copying the file, a strategy that works in many cases.</para>
-
-<para>The inode number for a file is calculated by hashing its full Win32 path.
-The inode number generated by the stat call always matches the one returned in
-d_ino of the dirent structure.  It is worth noting that the number produced by
-this method is not guaranteed to be unique.  However, we have not found this to
-be a significant problem because of the low probability of generating a
-duplicate inode number.</para>
-
-<para>Chroot is supported since release 1.1.3. Note that chroot isn't
-supported native by Windows. This implies some restrictions. First of all,
-the chroot call isn't a privileged call. Each user may call it. Second, the
-chroot environment isn't safe against native windows processes. If you
-want to support a chroot environment as, for example, by allowing an
-anonymous ftp with restricted access, you'll have to care that only
-native Cygwin applications are accessible inside of the chroot environment.
-Since that applications are only using the Cygwin POSIX API to access the
-file system their access can be restricted as it is intended. This includes
-not only POSIX paths but Win32 paths (containing drive letter and/or
-backslashes) and CIFS paths (//server/share or \\server\share) as well.</para>
-</sect2>
-
-<sect2 id="ov-hi-textvsbinary"><title>Text Mode vs. Binary Mode</title>
-<para>Interoperability with other Win32 programs such as text editors was
-critical to the success of the port of the development tools.  Most Cygnus
-customers upgrading from the older DOS-hosted toolchains expected the new
-Win32-hosted ones to continue to work with their old development
-sources.</para>
-
-<para>Unfortunately, UNIX and Win32 use different end-of-line terminators in
-text files.  Consequently, carriage-return newlines have to be translated on
-the fly by Cygwin into a single newline when reading in text mode.  The
-control-z character is interpreted as a valid end-of-file character for a
-similar reason.</para>
-
-<para>This solution addresses the compatibility requirement at the expense of
-violating the POSIX standard that states that text and binary mode will be
-identical. Consequently, processes that attempt to lseek through text files can
-no longer rely on the number of bytes read as an accurate indicator of position
-in the file.  For this reason, the CYGWIN environment variable can be
-set to override this behavior.</para>
-</sect2>
-
-<sect2 id="ov-hi-ansiclib"><title>ANSI C Library</title>
-<para>We chose to include
-Cygnus' own existing ANSI C library
-"newlib" as part of the library, rather than write all of the lib C
-and math calls from scratch.  Newlib is a BSD-derived ANSI C library,
-previously only used by cross-compilers for embedded systems
-development.</para>
-
-<para>The reuse of existing free implementations of such things
-as the glob, regexp, and getopt libraries saved us considerable
-effort.  In addition, Cygwin uses Doug Lea's free malloc
-implementation that successfully balances speed and compactness.  The
-library accesses the malloc calls via an exported function pointer.
-This makes it possible for a Cygwin process to provide its own
-malloc if it so desires.</para>
-</sect2>
-
-<sect2 id="ov-hi-process"><title>Process Creation</title>
-<para>The fork call in Cygwin is particularly interesting because it
-does not map well on top of the Win32 API.  This makes it very
-difficult to implement correctly.  Currently, the Cygwin fork is a
-non-copy-on-write implementation similar to what was present in early
-flavors of UNIX.</para>
-
-<para>The first thing that happens when a parent process
-forks a child process is that the parent initializes a space in the
-Cygwin process table for the child.  It then creates a suspended
-child process using the Win32 CreateProcess call.  Next, the parent
-process calls setjmp to save its own context and sets a pointer to
-this in a Cygwin shared memory area (shared among all Cygwin
-tasks).  It then fills in the child's .data and .bss sections by
-copying from its own address space into the suspended child's address
-space.  After the child's address space is initialized, the child is
-run while the parent waits on a mutex.  The child discovers it has
-been forked and longjumps using the saved jump buffer.  The child then
-sets the mutex the parent is waiting on and blocks on another mutex.
-This is the signal for the parent to copy its stack and heap into the
-child, after which it releases the mutex the child is waiting on and
-returns from the fork call.  Finally, the child wakes from blocking on
-the last mutex, recreates any memory-mapped areas passed to it via the
-shared area, and returns from fork itself.</para>
-
-<para>While we have some
-ideas as to how to speed up our fork implementation by reducing the
-number of context switches between the parent and child process, fork
-will almost certainly always be inefficient under Win32.  Fortunately,
-in most circumstances the spawn family of calls provided by Cygwin
-can be substituted for a fork/exec pair with only a little effort.
-These calls map cleanly on top of the Win32 API.  As a result, they
-are much more efficient.  Changing the compiler's driver program to
-call spawn instead of fork was a trivial change and increased
-compilation speeds by twenty to thirty percent in our
-tests.</para>
-
-<para>However, spawn and exec present their own set of
-difficulties.  Because there is no way to do an actual exec under
-Win32, Cygwin has to invent its own Process IDs (PIDs).  As a
-result, when a process performs multiple exec calls, there will be
-multiple Windows PIDs associated with a single Cygwin PID.  In some
-cases, stubs of each of these Win32 processes may linger, waiting for
-their exec'd Cygwin process to exit.</para>
-</sect2>
-
-<sect2 id="ov-hi-signals"><title>Signals</title>
-<para>When
-a Cygwin process starts, the library starts a secondary thread for
-use in signal handling.  This thread waits for Windows events used to
-pass signals to the process.  When a process notices it has a signal,
-it scans its signal bitmask and handles the signal in the appropriate
-fashion.</para>
-
-<para>Several complications in the implementation arise from the
-fact that the signal handler operates in the same address space as the
-executing program.  The immediate consequence is that Cygwin system
-functions are interruptible unless special care is taken to avoid
-this.   We go to some lengths to prevent the sig_send function that
-sends signals from being interrupted.  In the case of a process
-sending a signal to another process, we place a mutex around sig_send
-such that sig_send will not be interrupted until it has completely
-finished sending the signal.</para>
-
-<para>In the case of a process sending
-itself a signal, we use a separate semaphore/event pair instead of the
-mutex.  sig_send starts by resetting the event and incrementing the
-semaphore that flags the signal handler to process the signal.  After
-the signal is processed, the signal handler signals the event that it
-is done.  This process keeps intraprocess signals synchronous, as
-required by POSIX.</para>
-
-<para>Most standard UNIX signals are provided.  Job
-control works as expected in shells that support
-it.</para>
-</sect2>
-
-<sect2 id="ov-hi-sockets"><title>Sockets</title>
-<para>Socket-related calls in Cygwin simply
-call the functions by the same name in Winsock, Microsoft's
-implementation of Berkeley sockets.  Only a few changes were needed to
-match the expected UNIX semantics - one of the most troublesome
-differences was that Winsock must be initialized before the first
-socket function is called.  As a result, Cygwin has to perform this
-initialization when appropriate.  In order to support sockets across
-fork calls, child processes initialize Winsock if any inherited file
-descriptor is a socket.</para>
-
-<para>Unfortunately, implicitly loading DLLs
-at process startup is usually a slow affair.  Because many processes
-do not use sockets, Cygwin explicitly loads the Winsock DLL the
-first time it calls the Winsock initialization routine.  This single
-change sped up GNU configure times by thirty
-percent.</para>
-</sect2>
-
-<sect2 id="ov-hi-select"><title>Select</title>
-<para>The UNIX select function is another
-call that does not map cleanly on top of the Win32 API.  Much to our
-dismay, we discovered that the Win32 select in Winsock only worked on
-socket handles.  Our implementation allows select to function normally
-when given different types of file descriptors (sockets, pipes,
-handles, and a custom /dev/windows Windows messages
-pseudo-device).</para>
-
-<para>Upon entry into the select function, the first
-operation is to sort the file descriptors into the different types.
-There are then two cases to consider.  The simple case is when at
-least one file descriptor is a type that is always known to be ready
-(such as a disk file).  In that case, select returns immediately as
-soon as it has polled each of the other types to see if they are
-ready.  The more complex case involves waiting for socket or pipe file
-descriptors to be ready.  This is accomplished by the main thread
-suspending itself, after starting one thread for each type of file
-descriptor present.  Each thread polls the file descriptors of its
-respective type with the appropriate Win32 API call.  As soon as a
-thread identifies a ready descriptor, that thread signals the main
-thread to wake up.  This case is now the same as the first one since
-we know at least one descriptor is ready.  So select returns, after
-polling all of the file descriptors one last time.</para>
-</sect2>
author	cvs2svn <>	2000-07-28 22:33:44 +0000
committer	cvs2svn <>	2000-07-28 22:33:44 +0000
commit	074f88429327b287c95d145e30fe0f940c357231 (patch)
tree	894be5500c7e4d9aa7661f82fb3cb8a3746cf0ef /winsup/doc/overview2.sgml
parent	637f5ce0fecddfb14d8f0b6a12d791fac469ad84 (diff)
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