stout:~ [16:28:32]$ strace -eopen,unlink perl -e 'open $f, "+>", undef'
open("/etc/ld.so.preload", O_RDONLY)    = 3
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/libpthread.so.0", O_RDONLY)  = 3
open("/lib/libnsl.so.1", O_RDONLY)      = 3
open("/lib/libdl.so.2", O_RDONLY)       = 3
open("/lib/libm.so.6", O_RDONLY)        = 3
open("/lib/libcrypt.so.1", O_RDONLY)    = 3
open("/lib/libutil.so.1", O_RDONLY)     = 3
open("/lib/libc.so.6", O_RDONLY)        = 3
open("/dev/urandom", O_RDONLY|O_LARGEFILE) = 3
open("/dev/null", O_RDONLY|O_LARGEFILE) = 3
open("/tmp/PerlIO_dr5fu4", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0600) = 3
unlink("/tmp/PerlIO_dr5fu4")            = 0
Process 17389 detached

##</code><code>##

stout:~ [16:29:17]$ perl -le 'open $f, "+>", undef; system "ls -l /proc/$$/fd"'
total 5
lrwx------ 1 blazar users 64 Dec  6 16:29 0 -> /dev/pts/0
lrwx------ 1 blazar users 64 Dec  6 16:29 1 -> /dev/pts/0
lrwx------ 1 blazar users 64 Dec  6 16:29 2 -> /dev/pts/0
lrwx------ 1 blazar users 64 Dec  6 16:29 3 -> /tmp/.nfs0036408900000221
lr-x------ 1 blazar users 64 Dec  6 16:29 4 -> pipe:[12410097]