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ash: optional support for $TMOUT variable

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2011-02-04 17:53:59 +01:00
parent 8c52f80397
commit 046341e8bd
2 changed files with 50 additions and 1 deletions
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47
shell/ash.c
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@@ -97,6 +97,14 @@
//config: help
//config: Enable bash-compatible extensions.
//config:
//config:config ASH_IDLE_TIMEOUT
//config: bool "Idle timeout variable"
//config: default n
//config: depends on ASH
//config: help
//config: Enables bash-like auto-logout after "$TMOUT" seconds
//config: of idle time.
//config:
//config:config ASH_JOB_CONTROL
//config: bool "Job control"
//config: default y
@@ -12048,6 +12056,23 @@ evalcmd(int argc UNUSED_PARAM, char **argv)
return exitstatus;
}
#if ENABLE_ASH_IDLE_TIMEOUT
static smallint timed_out;
static void alrm_sighandler(int sig UNUSED_PARAM)
{
/* Close stdin, making interactive command reading stop.
* Otherwise, timeout doesn't trigger until <Enter> is pressed.
*/
int sv = errno;
close(0);
open("/dev/null", O_RDONLY);
errno = sv;
timed_out = 1;
}
#endif
/*
* Read and execute commands.
* "Top" is nonzero for the top level command loop;
@@ -12064,6 +12089,20 @@ cmdloop(int top)
TRACE(("cmdloop(%d) called\n", top));
for (;;) {
int skip;
#if ENABLE_ASH_IDLE_TIMEOUT
int tmout_seconds = 0;
if (top && iflag) {
const char *tmout_var = lookupvar("TMOUT");
if (tmout_var) {
tmout_seconds = atoi(tmout_var);
if (tmout_seconds > 0) {
signal(SIGALRM, alrm_sighandler);
alarm(tmout_seconds);
}
}
}
#endif
setstackmark(&smark);
#if JOBS
@@ -12076,6 +12115,14 @@ cmdloop(int top)
chkmail();
}
n = parsecmd(inter);
#if ENABLE_ASH_IDLE_TIMEOUT
if (timed_out) {
printf("\007timed out waiting for input: auto-logout\n");
break;
}
if (tmout_seconds > 0)
alarm(0);
#endif
#if DEBUG
if (DEBUG > 2 && debug && (n != NODE_EOF))
showtree(n);