Hi!
----
Attached (as "astksh_chroot_cd_devfd_cd_f_20120911_001.diff.txt") is a
patch which fixes two issues with "cd":
1. $ cd /dev/fd/$fd # doesn't work in chroot'ed environments when
/dev/fd is not mounted (thanks to CERN staff for reporting this).
2. POSIX does not mandate _any_ paths. Since doing a "cd" relative to
a directory fd has become very popular the request was made to add an
alternative to using /dev/fd which is more or less acceptable for the
POSIX people. Based on that and a few discussions I added the option
-f to cd that a directory descriptor can be passed and the path given
is relative to that file descriptor.
Notes:
- The code introduces a new function called |pathdevfd2relpathfd()| in
libast which can extract the fd number from a /dev/fd/$fd path (even
nested)
- If files or directories are opened relative to /dev/fd/$fd/$path
|sfopen()|/|sfopenat()| will now bypass the /dev/fd filesystem
completely (which gives a nice performance boost). The only exception
is that this can *NOT* be done for a plain /dev/fd/$fd, e.g.
/dev/fd/15. The problem is that there is AFAIK no way to open a file
from a file descriptor without using the /dev/fd filesystem or using
|dup()| ... but |dup()| rules itself out because the resulting
"cloned" fd still shares attributes like the current seek position
with the original fd...
Glenn: Is it acceptable for |sfopen()| to |dup()| the incoming file fd
(see "Notes" above) ?
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) roland.ma...@nrubsig.org
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
(;O/ \/ \O;)
diff -r -u -N original/src/cmd/ksh93/bltins/cd_pwd.c
build_fd/src/cmd/ksh93/bltins/cd_pwd.c
--- src/cmd/ksh93/bltins/cd_pwd.c 2012-08-09 15:24:15.000000000 +0200
+++ src/cmd/ksh93/bltins/cd_pwd.c 2012-09-14 04:28:45.561627242 +0200
@@ -19,8 +19,8 @@
***********************************************************************/
#pragma prototyped
/*
- * cd [-LP@] [dirname]
- * cd [-LP@] [old] [new]
+ * cd [-LP@f] [dirname]
+ * cd [-LP@f] [old] [new]
* pwd [-LP]
*
* David Korn
@@ -68,6 +68,10 @@
NOT_USED(xattr);
#endif
+ path = pathdevfd2relpathfd(path, &dir);
+ if (!path)
+ path = e_dot;
+
#ifdef O_XATTR
if(xattr)
{
@@ -157,12 +161,21 @@
int saverrno=0;
int rval,flag=0,xattr=0;
char *oldpwd;
+ int dirfd = shp->pwdfd;
int newdirfd;
Namval_t *opwdnod, *pwdnod;
if(sh_isoption(shp,SH_RESTRICTED))
errormsg(SH_DICT,ERROR_exit(1),e_restricted+4);
while((rval = optget(argv,sh_optcd))) switch(rval)
{
+#ifdef AT_FDCWD
+ case 'f':
+ errno = 0;
+ dirfd = strtol(opt_info.arg, (char **)NULL, 10);
+ if ((errno != 0) || (dirfd < 0))
+ errormsg(SH_DICT, ERROR_system(1), "%s: invalid
dir fd", opt_info.arg);
+ break;
+#endif
case 'L':
flag = 0;
break;
@@ -244,14 +257,18 @@
dir = sfstruse(shp->strbuf);
}
}
-#ifdef O_XATTR
- if (xattr)
-# ifdef PATH_BFPATH
+ if (
+#if defined(O_XATTR) || defined(AT_FDCWD)
+# ifdef O_XATTR
+ xattr ||
+# endif
+ (shp->pwdfd != dirfd))
+# ifdef PATH_BFPATH
cdpath = NULL;
-# else
+# else
cdpath = "";
-# endif
-#endif
+# endif
+#endif /* defined(O_XATTR) || defined(AT_FDCWD) */
rval = -1;
do
@@ -294,7 +311,7 @@
#endif /* SHOPT_FS_3D */
}
rval = newdirfd = sh_diropenat(shp,
- ((shp->pwdfd >= 0)?shp->pwdfd:AT_FDCWD),
+ ((dirfd >= 0)?dirfd:AT_FDCWD),
path_relative(shp,stakptr(PATH_OFFSET)), xattr);
if(newdirfd >=0)
{
diff -r -u -N original/src/cmd/ksh93/data/builtins.c
build_fd/src/cmd/ksh93/data/builtins.c
--- src/cmd/ksh93/data/builtins.c 2012-09-05 23:59:37.000000000 +0200
+++ src/cmd/ksh93/data/builtins.c 2012-09-14 02:24:42.136895254 +0200
@@ -442,7 +442,7 @@
;
const char sh_optcd[] =
-"[-1c?\n@(#)$Id: cd (AT&T Research) 2012-07-10 $\n]"
+"[-1c?\n@(#)$Id: cd (AT&T Research) 2012-09-11 $\n]"
USAGE_LICENSE
"[+NAME?cd - change working directory ]"
"[+DESCRIPTION?\bcd\b changes the current working directory of the "
@@ -478,6 +478,9 @@
"\bPATH_RESOLVE\b. If \bPATH_RESOLVE\b is \bphysical\b, "
"then the behavior will be as if \b-P\b were specified. Otherwise, "
"the behavior will be as if \b-L\b were specified.]"
+#ifdef AT_FDCWD
+"[f]#[dirfd?Path is relative to this directory fd.]"
+#endif
"[L?Handle each pathname component \b..\b in a logical fashion by moving "
"up one level by name in the present working directory.]"
"[P?The present working directory is first converted to an absolute pathname "
diff -r -u -N original/src/cmd/ksh93/sh/io.c build_fd/src/cmd/ksh93/sh/io.c
--- src/cmd/ksh93/sh/io.c 2012-09-05 23:53:53.000000000 +0200
+++ src/cmd/ksh93/sh/io.c 2012-09-14 04:40:26.639221455 +0200
@@ -755,6 +755,10 @@
register int fd = -1;
mode_t mode;
char *e;
+#ifdef AT_FDCWD
+ const char *apath;
+ int dirfd = shp->pwdfd;
+#endif
va_list ap;
va_start(ap, flags);
mode = (flags & O_CREAT) ? va_arg(ap, int) : 0;
@@ -770,10 +774,37 @@
errno = ENOENT;
return(-1);
}
+#ifdef AT_FDCWD
+ if (path[0]=='/')
+ {
+ apath = pathdevfd2relpathfd(path, &dirfd);
+ /*
+ * |pathdevfd2relpathfd()| will return |NULL| if
+ * /dev/fd/${num} is not followed by a path.
+ * Question is whether we can use |dup()| in
+ * such a case (warning: |dup()| will cause both
+ * old and new fd to share attributes like the
+ * seek position)
+ */
+ if (apath)
+ path = apath;
+ else if (path[strlen(path)-1]=='/')
+ {
+ /*
+ * If |pathdevfd2relpathfd()| returned |NULL|
+ * and the input path ends with a '/' (e.g.
+ * "/dev/fd/89/") we can happily assume it's
+ * a directory...
+ */
+ path = e_dot;
+ }
+ }
+#endif /* AT_FDCWD */
if (path[0]=='/' && path[1]=='d' && path[2]=='e' && path[3]=='v' &&
path[4]=='/')
{
switch (path[5])
{
+#ifndef AT_FDCWD
case 'f':
if (path[6]=='d' && path[7]=='/')
{
@@ -784,6 +815,7 @@
fd = -1;
}
break;
+#endif
case 's':
if (path[6]=='t' && path[7]=='d')
switch (path[8])
@@ -824,13 +856,21 @@
struct stat st;
if (stat(path,&st) >=0)
{
+#ifdef AT_FDCWD
+ while((nfd =
openat(dirfd,path,flags,st.st_mode))<0 && errno==EINTR)
+#else
while((nfd = open(path,flags,st.st_mode))<0 &&
errno==EINTR)
+#endif
errno = err;
}
}
else
{
+#ifdef AT_FDCWD
+ while((nfd = openat(dirfd,path,flags))<0 &&
errno==EINTR)
+#else
while((nfd = open(path,flags))<0 && errno==EINTR)
+#endif
errno = err;
}
if(nfd>=0)
@@ -858,7 +898,11 @@
path = buf;
}
#endif
+#ifdef AT_FDCWD
+ while((fd = openat(dirfd, path, flags, mode)) < 0)
+#else
while((fd = open(path, flags, mode)) < 0)
+#endif
if(errno!=EINTR || shp->trapnote)
return(-1);
}
diff -r -u -N original/src/lib/libast/include/ast.h
build_fd/src/lib/libast/include/ast.h
--- src/lib/libast/include/ast.h 2012-08-09 09:24:49.000000000 +0200
+++ src/lib/libast/include/ast.h 2012-09-14 03:37:52.182403240 +0200
@@ -300,6 +300,7 @@
extern char* pathcat_20100601(const char*, int, const char*, const
char*, char*, size_t);
extern int pathcd(const char*, const char*);
extern int pathcheck(const char*, const char*, Pathcheck_t*);
+extern const char * pathdevfd2relpathfd(const char *, int *);
extern int pathexists(char*, int);
extern char* pathfind(const char*, const char*, const char*, char*,
size_t);
extern int pathgetlink(const char*, char*, int);
diff -r -u -N original/src/lib/libast/Makefile build_fd/src/lib/libast/Makefile
--- src/lib/libast/Makefile 2012-07-31 20:29:26.000000000 +0200
+++ src/lib/libast/Makefile 2012-09-14 03:40:38.780372849 +0200
@@ -79,7 +79,7 @@
pathexists.c pathfind.c pathkey.c pathprobe.c pathrepl.c \
pathnative.c pathposix.c pathtemp.c pathtmp.c pathstat.c \
pathgetlink.c pathsetlink.c pathbin.c pathshell.c pathcd.c \
- pathprog.c \
+ pathdevfd2relpathfd.c pathprog.c \
fs3d.c ftwalk.c ftwflags.c fts.c \
astintercept.c conformance.c getenv.c setenviron.c \
optget.c optjoin.c optesc.c optctx.c strsort.c struniq.c \
diff -r -u -N original/src/lib/libast/Mamfile build_fd/src/lib/libast/Mamfile
--- src/lib/libast/Mamfile 2012-09-12 06:32:14.000000000 +0200
+++ src/lib/libast/Mamfile 2012-09-14 03:40:18.456277422 +0200
@@ -1197,6 +1197,18 @@
prev path/pathcd.c
exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -Icomp -Iinclude -Istd
-D_PACKAGE_ast -c path/pathcd.c
done pathcd.o generated
+make pathdevfd2relpathfd.o
+make path/pathdevfd2relpathfd.c
+make include/stk.h implicit
+prev include/sfio.h implicit
+done include/stk.h
+prev include/error.h implicit
+prev include/ast.h implicit
+done path/pathdevfd2relpathfd.c
+meta pathdevfd2relpathfd.o %.c>%.o path/pathdevfd2relpathfd.c
pathdevfd2relpathfd
+prev path/pathdevfd2relpathfd.c
+exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -Icomp -Iinclude -Istd
-D_PACKAGE_ast -c path/pathdevfd2relpathfd.c
+done pathdevfd2relpathfd.o generated
make pathprog.o
make path/pathprog.c
make FEATURE/prog implicit
@@ -6115,7 +6127,7 @@
exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -Icomp -Iinclude -Istd
-D_PACKAGE_ast -c obsolete/spawn.c
done spawn.o generated
exec - ${AR} rc libast.a state.o transition.o opendir.o readdir.o rewinddir.o
seekdir.o telldir.o getcwd.o fastfind.o hashalloc.o hashdump.o hashfree.o
hashlast.o hashlook.o hashscan.o hashsize.o hashview.o hashwalk.o memhash.o
memsum.o strhash.o strkey.o strsum.o stracmp.o strnacmp.o ccmap.o ccmapid.o
ccnative.o chresc.o chrtoi.o
-exec - ${AR} rc libast.a streval.o strexpr.o strmatch.o strcopy.o modei.o
modex.o strmode.o strlcat.o strlcpy.o strlook.o strncopy.o strsearch.o
strpsearch.o stresc.o stropt.o strtape.o strpcmp.o strnpcmp.o strvcmp.o
strnvcmp.o tok.o tokline.o tokscan.o pathaccess.o pathcat.o pathcanon.o
pathcheck.o pathpath.o pathexists.o pathfind.o pathkey.o pathprobe.o pathrepl.o
pathnative.o pathposix.o pathtemp.o pathtmp.o pathstat.o pathgetlink.o
pathsetlink.o pathbin.o pathshell.o pathcd.o pathprog.o fs3d.o ftwalk.o
ftwflags.o fts.o astintercept.o conformance.o getenv.o setenviron.o optget.o
optjoin.o optesc.o optctx.o strsort.o struniq.o magic.o mime.o mimetype.o
signal.o sigflag.o systrace.o error.o errorf.o errormsg.o errorx.o localeconv.o
setlocale.o translate.o catopen.o iconv.o lc.o lctab.o mc.o base64.o recfmt.o
recstr.o reclen.o fmtrec.o fmtbase.o fmtbuf.o fmtclock.o fmtdev.o fmtelapsed.o
fmterror.o fmtesc.o fmtfmt.o fmtfs.o fmtident.o fmtint.o fmtip4.o fmtip6.o
fmtls.o fmtmatch.o fmtmode.o fmtnum.o fmtperm.o fmtre.o fmttime.o
+exec - ${AR} rc libast.a streval.o strexpr.o strmatch.o strcopy.o modei.o
modex.o strmode.o strlcat.o strlcpy.o strlook.o strncopy.o strsearch.o
strpsearch.o stresc.o stropt.o strtape.o strpcmp.o strnpcmp.o strvcmp.o
strnvcmp.o tok.o tokline.o tokscan.o pathaccess.o pathcat.o pathcanon.o
pathcheck.o pathpath.o pathexists.o pathfind.o pathkey.o pathprobe.o pathrepl.o
pathnative.o pathposix.o pathtemp.o pathtmp.o pathstat.o pathgetlink.o
pathsetlink.o pathbin.o pathshell.o pathcd.o pathdevfd2relpathfd.o pathprog.o
fs3d.o ftwalk.o ftwflags.o fts.o astintercept.o conformance.o getenv.o
setenviron.o optget.o optjoin.o optesc.o optctx.o strsort.o struniq.o magic.o
mime.o mimetype.o signal.o sigflag.o systrace.o error.o errorf.o errormsg.o
errorx.o localeconv.o setlocale.o translate.o catopen.o iconv.o lc.o lctab.o
mc.o base64.o recfmt.o recstr.o reclen.o fmtrec.o fmtbase.o fmtbuf.o fmtclock.o
fmtdev.o fmtelapsed.o fmterror.o fmtesc.o fmtfmt.o fmtfs.o fmtident.o fmtint.o
fmtip4.o fmtip6.o fmtls.o fmtmatch.o fmtmode.o fmtnum.o fmtperm.o fmtre.o
fmttime.o
exec - ${AR} rc libast.a fmtuid.o fmtgid.o fmtsignal.o fmtscale.o fmttmx.o
fmttv.o fmtversion.o strelapsed.o strperm.o struid.o strgid.o strtoip4.o
strtoip6.o stack.o stk.o swapget.o swapmem.o swapop.o swapput.o sigdata.o
sigcrit.o sigunblock.o procopen.o procclose.o procrun.o procfree.o tmdate.o
tmequiv.o tmfix.o tmfmt.o tmform.o tmgoff.o tminit.o tmleap.o tmlex.o
tmlocale.o tmmake.o tmpoff.o tmscan.o tmsleep.o tmtime.o tmtype.o tmweek.o
tmword.o tmzone.o tmxdate.o tmxduration.o tmxfmt.o tmxgettime.o tmxleap.o
tmxmake.o tmxscan.o tmxsettime.o tmxsleep.o tmxtime.o tmxtouch.o tvcmp.o
tvgettime.o tvsettime.o tvsleep.o tvtouch.o cmdarg.o vecargs.o vecfile.o
vecfree.o vecload.o vecstring.o univdata.o touch.o mnt.o debug.o memccpy.o
memchr.o memcmp.o memcpy.o memdup.o memmove.o memset.o mkdir.o mkfifo.o mknod.o
rmdir.o remove.o rename.o link.o unlink.o strdup.o strchr.o strrchr.o strstr.o
strtod.o strtold.o strtol.o strtoll.o strtoul.o strtoull.o strton.o strtonll.o
strntod.o strntold.o strnton.o
exec - ${AR} rc libast.a strntonll.o strntol.o strntoll.o strntoul.o
strntoull.o strcasecmp.o strncasecmp.o strerror.o mktemp.o tmpnam.o fsync.o
execlp.o execve.o execvp.o execvpe.o spawnveg.o vfork.o killpg.o hsearch.o
tsearch.o getlogin.o putenv.o setenv.o unsetenv.o lstat.o statvfs.o eaccess.o
gross.o omitted.o readlink.o symlink.o getpgrp.o setpgid.o setsid.o waitpid.o
creat64.o fcntl.o open.o atexit.o getdents.o getwd.o dup2.o errno.o
getpreroot.o ispreroot.o realopen.o setpreroot.o getgroups.o mount.o system.o
iblocks.o modedata.o tmdata.o memfatal.o sfkeyprintf.o sfdcdio.o sfdcdos.o
sfdcfilter.o sfdcseekable.o sfdcslow.o sfdcsubstr.o sfdctee.o sfdcunion.o
sfdcmore.o sfdcprefix.o wc.o wc2utf8.o basename.o closelog.o dirname.o
fmtmsglib.o fnmatch.o ftw.o getdate.o getsubopt.o glob.o nftw.o openlog.o
re_comp.o resolvepath.o realpath.o regcmp.o regexp.o setlogmask.o strftime.o
strptime.o swab.o syslog.o tempnam.o wordexp.o mktime.o regalloc.o regclass.o
regcoll.o regcomp.o regcache.o regdecomp.o regerror.o regexec.o regfatal.o
reginit.o
exec - ${AR} rc libast.a regnexec.o regsubcomp.o regsubexec.o regsub.o
regrecord.o regrexec.o regstat.o dtclose.o dtdisc.o dthash.o dtlist.o
dtmethod.o dtopen.o dtstat.o dtstrhash.o dttree.o dtuser.o dtview.o dtwalk.o
dtnew.o dtcomp.o sfclose.o sfclrlock.o sfdisc.o sfdlen.o sfexcept.o sfgetl.o
sfgetu.o sfcvt.o sfecvt.o sffcvt.o sfextern.o sffilbuf.o sfflsbuf.o sfprints.o
sfgetd.o sfgetr.o sfllen.o sfmode.o sfmove.o sfnew.o sfpkrd.o sfnotify.o
sfnputc.o sfopen.o sfpeek.o sfpoll.o sfpool.o sfpopen.o sfprintf.o sfputd.o
sfputl.o sfputr.o sfputu.o sfrd.o sfread.o sfreserve.o sfscanf.o sfseek.o
sfset.o sfsetbuf.o sfsetfd.o sfsize.o sfsk.o sfstack.o sfstrtod.o sfsync.o
sfswap.o sftable.o sftell.o sftmp.o sfungetc.o sfvprintf.o sfvscanf.o sfwr.o
sfwrite.o sfpurge.o sfraise.o sfwalk.o sfgetm.o sfmutex.o sfputm.o sfresize.o
_sfclrerr.o _sfeof.o _sferror.o _sffileno.o _sfopen.o _sfstacked.o _sfvalue.o
_sfgetc.o _sfgetl.o _sfgetl2.o _sfgetu.o _sfgetu2.o _sfdlen.o _sfllen.o
_sfslen.o _sfulen.o _sfputc.o _sfputd.o
diff -r -u -N original/src/lib/libast/path/pathdevfd2relpathfd.c
build_fd/src/lib/libast/path/pathdevfd2relpathfd.c
--- src/lib/libast/path/pathdevfd2relpathfd.c 1970-01-01 01:00:00.000000000
+0100
+++ src/lib/libast/path/pathdevfd2relpathfd.c 2012-09-14 05:40:36.211985009
+0200
@@ -0,0 +1,110 @@
+/***********************************************************************
+* *
+* This software is part of the ast package *
+* Copyright (c) 1985-2011 AT&T Intellectual Property *
+* and is licensed under the *
+* Eclipse Public License, Version 1.0 *
+* by AT&T Intellectual Property *
+* *
+* A copy of the License is available at *
+* http://www.eclipse.org/org/documents/epl-v10.html *
+* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
+* *
+* Information and Software Systems Research *
+* AT&T Research *
+* Florham Park NJ *
+* *
+* Roland Mainz <roland.ma...@nrubsig.org> *
+* *
+***********************************************************************/
+#pragma prototyped
+
+/*
+ * Strip leading /dev/fd/<num>... from paths and return relative path
+ * to that file descriptor
+ */
+
+#include <ast.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+
+/*
+ * Loop to collect all /dev/fd entries and either
+ * return the original path if it does not begin with
+ * /dev/fd/<number> or extract the <number> from
+ * /dev/fd/<number>... and return the remaining path
+ * relative to fd <number>. If nothing is left in the
+ * remaining relative path return |NULL|.
+ *
+ * Examples:
+ * path=|/dev/fd/| should return |/dev/fd/| and not touch fd_p
+ * path=|/dev/fd/45| should return NULL and *fd_p=45
+ * path=|/dev/fd/45/| should return NULL and *fd_p=45
+ * path=|/dev/fd/45/dev|| should return |dev|, *fd_p=45
+ * path=|/dev/fd/45/dev/fd/14/valeria| should return |valeria|
+ * and *fd_p=14
+ * path=|/dev/fd/45///////////////////dev/fd/14/hello|
+ * should return |hello| and *fd_p=14
+ * path=|//dev/fd/45/dev| should return |//dev/fd/45/dev| and
+ * not touch fd_p
+ */
+const char *pathdevfd2relpathfd(const char *p, int *fd_p)
+{
+ char buff[32];
+ char *b;
+ const char *s;
+ int fd;
+ bool relative_path=false;
+
+ /* Return immediately if this is a relative path... */
+ if (*p!='/')
+ return (p);
+ p++;
+
+ while(p[0]=='d' && p[1]=='e' && p[2]=='v' && p[3]=='/' &&
+ p[4]=='f' && p[5]=='d' && p[6]=='/' &&
+ isdigit(p[7]))
+
+ {
+ s=p+7;
+ b=buff;
+ while (isdigit(*s) && *s!='\0' && (b < (buff+sizeof(buff)-1)))
+ *b++ = *s++;
+ *b='\0';
+
+ errno=0;
+ fd=strtol(buff, NULL, 10);
+ if ((errno == 0) && (fd >= 0))
+ {
+ /*
+ * Eat all '/' to make sure the path we return
+ * is really a relative one (relative to the
+ * fd)
+ */
+ while (*s=='/')
+ s++;
+ p=s;
+ *fd_p=fd;
+ relative_path=true;
+ }
+ }
+
+ /*
+ * Make sure we return a relative path to the fd we returned,
+ * an absolute one would screw things up...
+ */
+ if (relative_path)
+ {
+ /* Nothing left ? */
+ if (*p=='\0')
+ p=NULL;
+ }
+ else
+ {
+ p--;
+ }
+
+ return (p);
+}
+
diff -r -u -N original/src/lib/libast/sfio/_sfopen.c
build_fd/src/lib/libast/sfio/_sfopen.c
--- src/lib/libast/sfio/_sfopen.c 2012-08-31 23:25:24.000000000 +0200
+++ src/lib/libast/sfio/_sfopen.c 2012-09-14 04:35:36.016886271 +0200
@@ -57,9 +57,30 @@
{
int fd, oldfd, oflags, fflags, sflags;
SFMTXDECL(f);
+#ifdef AT_FDCWD
+ if (file)
+ {
+ const char *afile;
- if (file && *file == '/')
- cwd = AT_FDCWD;
+ if (*file == '/')
+ {
+ cwd = AT_FDCWD;
+ afile = pathdevfd2relpathfd(file, &cwd);
+ /*
+ * |pathdevfd2relpathfd| will return |NULL| if
+ * /dev/fd/${num} is not followed by a path.
+ * Question is whether we can use |dup()| in
+ * such a case (warning: |dup()| will cause
+ * both old and new fd to share attributes
+ * like the seek position)
+ */
+ if (afile)
+ file = afile;
+ else if (file[strlen(file)-1]=='/')
+ file = ".";
+ }
+ }
+#endif
#if !defined(sysopenatf)
if (cwd != AT_FDCWD)
{
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