He! Yes, that looks like a blunder.
mkstemp() returns -1 on failure, not 0, so the test on ifd (and I suppose also the one on ifp) is wrong. And of course, once you close file descriptor 0, mkstemp() chooses the 1st available fd, i.e. 0, for its return value. -pd > On 9 Oct 2022, at 20:25 , Henrik Bengtsson <henrik.bengts...@gmail.com> wrote: > > Rscript fails to launch if the standard input (stdin) is closed, e.g. > > $ Rscript --vanilla -e 42 0<&- > Fatal error: creating temporary file for '-e' failed > > This appear to only happen with `-e EXPR`, e.g. it works when doing: > > $ echo "42" > script.R > $ Rscript --vanilla script.R 0<&- > [1] 42 > > and: > > $ R --vanilla 0<&- > R version 4.2.1 (2022-06-23) -- "Funny-Looking Kid" > Copyright (C) 2022 The R Foundation for Statistical Computing > Platform: x86_64-pc-linux-gnu (64-bit) > ... >> > > > TROUBLESHOOTING: > > $ strace Rscript --vanilla -e 42 0<&- > execve("/home/hb/shared/software/CBI/R-4.2.1-gcc9/bin/Rscript", > ["Rscript", "--vanilla", "-e", "42"], 0x7fff9f476418 /* 147 vars */) = > 0 > brk(NULL) = 0x5625ca9e6000 > arch_prctl(0x3001 /* ARCH_??? */, 0x7fff23b4d260) = -1 EINVAL (Invalid > argument) > ... > fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0), ...}) = 0 > write(1, "Fatal error: creating temporary "..., 53Fatal error: > creating temporary file for '-e' failed > ) = 53 > exit_group(2) = ? > +++ exited with 2 +++ > > which points to src/unix/system.c: > > ifd = mkstemp(ifile); > if (ifd > 0) > ifp = fdopen(ifd, "w+"); > if(!ifp) R_Suicide(_("creating temporary file for '-e' failed")); > > > One rationale for having closed standard files (including stdin) is to > avoid leaking file descriptors, cf. > https://wiki.sei.cmu.edu/confluence/display/c/FIO22-C.+Close+files+before+spawning+processes > and https://danwalsh.livejournal.com/53603.html. The background for > reporting on this was that `system()` fails to work in processx > spawned processes, which closes the standard files by default in > processx (<= 3.7.0). > > Best, > > Henrik > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel