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hush: fix multiple redirections of the same fd (bug 227) 

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-05-02 14:17:31 +02:00
parent 54e0843e7d
commit 1dd6cf8677
3 changed files with 15 additions and 2 deletions
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8
shell/hush.c
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@ -2646,7 +2646,9 @@ static int setup_redirects(struct command *prog, int squirrel[])
for (redir = prog->redirects; redir; redir = redir->next) {
if (redir->rd_type == REDIRECT_HEREDOC2) {
/* rd_fd<<HERE case */
if (squirrel && redir->rd_fd < 3) {
if (squirrel && redir->rd_fd < 3
&& squirrel[redir->rd_fd] < 0
) {
squirrel[redir->rd_fd] = dup(redir->rd_fd);
}
/* for REDIRECT_HEREDOC2, rd_filename holds _contents_
@ -2682,7 +2684,9 @@ static int setup_redirects(struct command *prog, int squirrel[])
}
if (openfd != redir->rd_fd) {
if (squirrel && redir->rd_fd < 3) {
if (squirrel && redir->rd_fd < 3
&& squirrel[redir->rd_fd] < 0
) {
squirrel[redir->rd_fd] = dup(redir->rd_fd);
}
if (openfd == REDIRFD_CLOSE) {

4
shell/hush_test/hush-misc/redir6.right Normal file
View File

@ -0,0 +1,4 @@
Testing multiple redirections to same fd
Hello
Done1
Done2

5
shell/hush_test/hush-misc/redir6.tests Executable file
View File

@ -0,0 +1,5 @@
echo "Testing multiple redirections to same fd"
# bug was making us lose fd #1 after this:
echo Hello >/dev/null 1>&2
echo Done1
echo Done2 >&2