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ash: fix "(cat < file)" hang introduced by rev 22944.

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This commit is contained in:
Denis Vlasenko 2008-08-16 11:48:02 +00:00
parent 8334db13c3
commit 34c73c499b
3 changed files with 20 additions and 11 deletions
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26
shell/ash.c
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@ -4905,7 +4905,11 @@ static int need_to_remember(struct redirtab *rp, int fd)
static int is_hidden_fd(struct redirtab *rp, int fd) static int is_hidden_fd(struct redirtab *rp, int fd)
{ {
int i; int i;
struct parsefile *pf = g_parsefile; struct parsefile *pf;
if (fd == -1)
return 0;
pf = g_parsefile;
while (pf) { while (pf) {
if (fd == pf->fd) { if (fd == pf->fd) {
return 1; return 1;
@ -5048,7 +5052,7 @@ redirect(union node *redir, int flags)
* Undo the effects of the last redirection. * Undo the effects of the last redirection.
*/ */
static void static void
popredir(int drop) popredir(int drop, int restore)
{ {
struct redirtab *rp; struct redirtab *rp;
int i; int i;
@ -5066,7 +5070,7 @@ popredir(int drop)
continue; continue;
} }
if (copy != EMPTY) { if (copy != EMPTY) {
if (!drop || (copy & COPYFD_RESTORE)) { if (!drop || (restore && (copy & COPYFD_RESTORE))) {
copy &= ~COPYFD_RESTORE; copy &= ~COPYFD_RESTORE;
/*close(fd);*/ /*close(fd);*/
copyfd(copy, fd | COPYFD_EXACT); copyfd(copy, fd | COPYFD_EXACT);
@ -5094,7 +5098,7 @@ clearredir(int drop)
g_nullredirs = 0; g_nullredirs = 0;
if (!redirlist) if (!redirlist)
break; break;
popredir(drop); popredir(drop, /*restore:*/ 0);
} }
} }
@ -7016,7 +7020,7 @@ shellexec(char **argv, const char *path, int idx)
int applet_no = -1; int applet_no = -1;
#endif #endif
clearredir(1); clearredir(/*drop:*/ 1);
envp = listvars(VEXPORT, VUNSET, 0); envp = listvars(VEXPORT, VUNSET, 0);
if (strchr(argv[0], '/') != NULL if (strchr(argv[0], '/') != NULL
#if ENABLE_FEATURE_SH_STANDALONE #if ENABLE_FEATURE_SH_STANDALONE
@ -7926,7 +7930,7 @@ evaltree(union node *n, int flags)
evaltree(n->nredir.n, flags & EV_TESTED); evaltree(n->nredir.n, flags & EV_TESTED);
status = exitstatus; status = exitstatus;
} }
popredir(0); popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
goto setstatus; goto setstatus;
case NCMD: case NCMD:
evalfn = evalcommand; evalfn = evalcommand;
@ -8707,11 +8711,11 @@ evalcommand(union node *cmd, int flags)
char *lastarg; char *lastarg;
const char *path; const char *path;
int spclbltin; int spclbltin;
int cmd_is_exec;
int status; int status;
char **nargv; char **nargv;
struct builtincmd *bcmd; struct builtincmd *bcmd;
int pseudovarflag = 0; smallint cmd_is_exec;
smallint pseudovarflag = 0;
/* First expand the arguments. */ /* First expand the arguments. */
TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
@ -8822,7 +8826,7 @@ evalcommand(union node *cmd, int flags)
if (spclbltin < 0) if (spclbltin < 0)
spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd); spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
if (cmdentry.u.cmd == EXECCMD) if (cmdentry.u.cmd == EXECCMD)
cmd_is_exec++; cmd_is_exec = 1;
#if ENABLE_ASH_CMDCMD #if ENABLE_ASH_CMDCMD
if (cmdentry.u.cmd == COMMANDCMD) { if (cmdentry.u.cmd == COMMANDCMD) {
path = oldpath; path = oldpath;
@ -8917,7 +8921,7 @@ evalcommand(union node *cmd, int flags)
} }
out: out:
popredir(cmd_is_exec); popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
if (lastarg) { if (lastarg) {
/* dsl: I think this is intended to be used to support /* dsl: I think this is intended to be used to support
* '_' in 'vi' command mode during line editing... * '_' in 'vi' command mode during line editing...
@ -13485,7 +13489,7 @@ reset(void)
tokpushback = 0; tokpushback = 0;
checkkwd = 0; checkkwd = 0;
/* from redir.c: */ /* from redir.c: */
clearredir(0); clearredir(/*drop:*/ 0);
} }
#if PROFILE #if PROFILE

2
shell/ash_test/ash-redir/redir6.right Normal file
View File

@ -0,0 +1,2 @@
Hello
OK

3
shell/ash_test/ash-redir/redir6.tests Executable file
View File

@ -0,0 +1,3 @@
# we had a bug where this would hang
(head -n 1 <redir6.right)
echo OK