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Backport bugfix for BUG_CSUBSTDO from ksh93v- 2012-08-24 (#259)

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This commit fixes BUG_CSUBSTDO, which could break stdout inside of
non-forking command substitutions. The breakage only occurred when
stdout was closed outside of the command substitution and a file
descriptor other than stdout was redirected in the command substitution
(such as stderr). Thanks to the ast-open-history repo, I was able to
identify and backport the bugfix from ksh93v- 2012-08-24.

This backport may fix other bugs as well. On 93v- 2012-08-24 it
fixed the regression below, though it was not triggered on 93u+(m).
  src/cmd/ksh93/tests/heredoc.sh
  487 print foo > $tmp/foofile 
  488 x=$( $SHELL 2> /dev/null 'read <<< $(<'"$tmp"'/foofile) 2> /dev/null;print -r "$REPLY"') 
  489 [[ $x == foo ]] || err_exit '<<< $(<file) not working' 

src/cmd/ksh93/sh/io.c: sh_open():
- If the just-opened file descriptor exists in sftable and is
  flagged with SF_STRING (as in non-forking command substitutions,
  among other situations), then move the file descriptor to a
  number >= 10.

src/cmd/ksh93/tests/io.sh:
- Add a regression test for BUG_CSUBSTDO, adapted from the one in
  modernish.
This commit is contained in:
Johnothan King 2021-04-08 05:24:17 -07:00 • committed by GitHub
parent b2a7ec032f
commit 0cd8646361
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 25 additions and 6 deletions
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11
src/cmd/ksh93/sh/io.c
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@ -755,6 +755,7 @@ onintr(struct addrinfo* addr, void* handle)
int sh_open(register const char *path, int flags, ...)
{
Shell_t *shp = sh_getinterp();
Sfio_t *sp;
register int fd = -1;
mode_t mode;
char *e;
@ -869,6 +870,16 @@ int sh_open(register const char *path, int flags, ...)
mode = IOREAD;
if(fd >= shp->gd->lim.open_max)
sh_iovalidfd(shp,fd);
if((sp = shp->sftable[fd]) && (sfset(sp,0,0) & SF_STRING))
{
int n,err=errno;
if((n = sh_fcntl(fd,F_DUPFD,10)) >= 10)
{
while(close(fd) < 0 && errno == EINTR)
errno = err;
fd = n;
}
}
shp->fdstatus[fd] = mode;
return(fd);
}