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diff -up ksh-20120801/src/cmd/ksh93/include/io.h.safefd ksh-20120801/src/cmd/ksh93/include/io.h
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--- ksh-20120801/src/cmd/ksh93/include/io.h.safefd 2015-03-03 18:21:40.544732158 +0100
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+++ ksh-20120801/src/cmd/ksh93/include/io.h 2015-03-03 18:22:16.284447849 +0100
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@@ -78,6 +78,7 @@ extern void sh_iorestore(Shell_t*,int,i
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extern Sfio_t *sh_iostream(Shell_t*,int);
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extern int sh_redirect(Shell_t*,struct ionod*,int);
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extern void sh_iosave(Shell_t *, int,int,char*);
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+extern int safefdnumber(Shell_t* shp, int sfd);
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extern int sh_iovalidfd(Shell_t*, int);
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extern int sh_inuse(Shell_t*, int);
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extern void sh_iounsave(Shell_t*);
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diff -up ksh-20120801/src/cmd/ksh93/sh/io.c.safefd ksh-20120801/src/cmd/ksh93/sh/io.c
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--- ksh-20120801/src/cmd/ksh93/sh/io.c.safefd 2015-03-03 18:21:40.511732421 +0100
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+++ ksh-20120801/src/cmd/ksh93/sh/io.c 2015-03-03 18:21:40.544732158 +0100
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@@ -1724,6 +1724,25 @@ void sh_iosave(Shell_t *shp, register in
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}
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}
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+int safefdnumber(Shell_t* shp, int sfd)
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+{
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+ register int fd;
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+
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+ while(1)
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+ {
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+ for(fd=0; fd < shp->topfd; fd++)
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+ {
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+ if (filemap[fd].save_fd==sfd || filemap[fd].orig_fd==sfd || (fcntl(sfd, F_GETFD) != -1 || errno != EBADF))
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+ {
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+ sfd++;
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+ continue;
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+ }
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+ }
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+ break;
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+ }
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+ return sfd;
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+}
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+
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/*
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* close all saved file descriptors
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*/
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diff -up ksh-20120801/src/cmd/ksh93/sh/subshell.c.safefd ksh-20120801/src/cmd/ksh93/sh/subshell.c
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--- ksh-20120801/src/cmd/ksh93/sh/subshell.c.safefd 2015-03-03 18:21:40.531732261 +0100
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+++ ksh-20120801/src/cmd/ksh93/sh/subshell.c 2015-03-03 18:21:40.544732158 +0100
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@@ -673,7 +673,7 @@ Sfio_t *sh_subshell(Shell_t *shp,Shnode_
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}
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if(iop && sffileno(iop)==1)
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{
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- int fd=sfsetfd(iop,3);
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+ int fd=sfsetfd(iop,safefdnumber(shp,3));
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if(fd<0)
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{
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shp->toomany = 1;
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