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diff -up ksh-20120801/src/cmd/ksh93/sh/io.c.orig ksh-20120801/src/cmd/ksh93/sh/io.c
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--- ksh-20120801/src/cmd/ksh93/sh/io.c.orig	2015-08-12 11:35:36.882268954 -0300
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+++ ksh-20120801/src/cmd/ksh93/sh/io.c	2015-08-12 11:44:06.324587019 -0300
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@@ -2580,10 +2580,18 @@ int sh_fcntl(register int fd, int op, ..
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 	if(newfd>=0) switch(op)
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 	{
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 	    case F_DUPFD:
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+#if F_dupfd_cloexec != F_DUPFD
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+	    case F_dupfd_cloexec:
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+#endif
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 		if(shp->fdstatus[fd] == IOCLOSE)
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 			shp->fdstatus[fd] = 0;
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 		if(newfd>=shp->gd->lim.open_max)
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 			sh_iovalidfd(shp,newfd);
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+#if F_dupfd_cloexec != F_DUPFD
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+		if(op==F_dupfd_cloexec)
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+			shp->fdstatus[newfd] = (shp->fdstatus[fd]|IOCLEX);
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+		else
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+#endif
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 		shp->fdstatus[newfd] = (shp->fdstatus[fd]&~IOCLEX);
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 		if(fdnotify)
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 			(*fdnotify)(fd,newfd);