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https://github.com/sheumann/hush.git
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ash: cleanup part 2.2
This commit is contained in:
Denis Vlasenko
parent
5651bfc204
commit
fc06f2968b
294
shell/ash.c
294
shell/ash.c
@ -2983,6 +2983,7 @@ static int shiftcmd(int, char **);
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static int setcmd(int, char **);
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static int nextopt(const char *);
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/* redir.h */
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/* flags passed to redirect */
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@ -2995,13 +2996,6 @@ static void clearredir(int);
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static int copyfd(int, int);
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static int redirectsafe(union node *, int);
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/* trap.h */
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static void clear_traps(void);
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static void setsignal(int);
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static int dotrap(void);
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static int is_safe_applet(char *name)
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{
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/* It isn't a bug to have non-existent applet here... */
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@ -3038,6 +3032,7 @@ static int is_safe_applet(char *name)
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/* ============ Alias handling */
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#if ENABLE_ASH_ALIAS
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#define ALIASINUSE 1
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@ -3232,6 +3227,7 @@ unaliascmd(int argc, char **argv)
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return i;
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}
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#endif /* ASH_ALIAS */
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@ -5653,6 +5649,43 @@ static int evalskip; /* set if we are skipping commands */
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static int skipcount; /* number of levels to skip */
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static int funcnest; /* depth of function calls */
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/* forward decl way out to parsing code - dotrap needs it */
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static int evalstring(char *s, int mask);
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/*
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* Called to execute a trap. Perhaps we should avoid entering new trap
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* handlers while we are executing a trap handler.
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*/
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static int
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dotrap(void)
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{
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char *p;
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char *q;
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int i;
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int savestatus;
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int skip = 0;
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savestatus = exitstatus;
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pendingsigs = 0;
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xbarrier();
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for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) {
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if (!*q)
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continue;
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*q = '\0';
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p = trap[i + 1];
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if (!p)
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continue;
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skip = evalstring(p, SKIPEVAL);
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exitstatus = savestatus;
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if (skip)
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break;
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}
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return skip;
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}
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/* forward declarations - evaluation is fairly recursive business... */
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static void evalloop(union node *, int);
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static void evalfor(union node *, int);
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@ -7319,6 +7352,93 @@ setinputstring(char *string)
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/* ============ jobs.c */
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/*
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* Set the signal handler for the specified signal. The routine figures
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* out what it should be set to.
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*/
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static void
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setsignal(int signo)
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{
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int action;
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char *t, tsig;
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struct sigaction act;
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t = trap[signo];
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if (t == NULL)
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action = S_DFL;
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else if (*t != '\0')
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action = S_CATCH;
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else
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action = S_IGN;
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if (rootshell && action == S_DFL) {
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switch (signo) {
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case SIGINT:
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if (iflag || minusc || sflag == 0)
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action = S_CATCH;
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break;
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case SIGQUIT:
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#if DEBUG
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if (debug)
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break;
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#endif
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/* FALLTHROUGH */
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case SIGTERM:
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if (iflag)
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action = S_IGN;
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break;
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#if JOBS
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case SIGTSTP:
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case SIGTTOU:
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if (mflag)
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action = S_IGN;
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break;
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#endif
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}
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}
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t = &sigmode[signo - 1];
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tsig = *t;
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if (tsig == 0) {
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/*
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* current setting unknown
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*/
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if (sigaction(signo, 0, &act) == -1) {
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/*
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* Pretend it worked; maybe we should give a warning
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* here, but other shells don't. We don't alter
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* sigmode, so that we retry every time.
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*/
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return;
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}
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if (act.sa_handler == SIG_IGN) {
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if (mflag
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&& (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
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) {
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tsig = S_IGN; /* don't hard ignore these */
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} else
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tsig = S_HARD_IGN;
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} else {
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tsig = S_RESET; /* force to be set */
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}
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}
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if (tsig == S_HARD_IGN || tsig == action)
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return;
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switch (action) {
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case S_CATCH:
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act.sa_handler = onsig;
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break;
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case S_IGN:
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act.sa_handler = SIG_IGN;
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break;
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default:
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act.sa_handler = SIG_DFL;
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}
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*t = action;
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act.sa_flags = 0;
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sigfillset(&act.sa_mask);
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sigaction(signo, &act, 0);
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}
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/* mode flags for set_curjob */
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#define CUR_DELETE 2
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#define CUR_RUNNING 1
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@ -8497,6 +8617,25 @@ commandtext(union node *n)
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*
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* Called with interrupts off.
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*/
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/*
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* Clear traps on a fork.
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*/
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static void
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clear_traps(void)
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{
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char **tp;
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for (tp = trap; tp < &trap[NSIG]; tp++) {
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if (*tp && **tp) { /* trap not NULL or SIG_IGN */
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INT_OFF;
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free(*tp);
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*tp = NULL;
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if (tp != &trap[0])
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setsignal(tp - trap);
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INT_ON;
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}
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}
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}
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static void
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forkchild(struct job *jp, union node *n, int mode)
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{
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@ -11264,147 +11403,6 @@ trapcmd(int argc, char **argv)
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return 0;
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}
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/*
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* Clear traps on a fork.
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*/
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static void
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clear_traps(void)
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{
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char **tp;
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for (tp = trap; tp < &trap[NSIG]; tp++) {
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if (*tp && **tp) { /* trap not NULL or SIG_IGN */
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INT_OFF;
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free(*tp);
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*tp = NULL;
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if (tp != &trap[0])
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setsignal(tp - trap);
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INT_ON;
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}
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}
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}
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/*
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* Set the signal handler for the specified signal. The routine figures
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* out what it should be set to.
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*/
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static void
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setsignal(int signo)
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{
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int action;
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char *t, tsig;
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struct sigaction act;
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t = trap[signo];
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if (t == NULL)
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action = S_DFL;
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else if (*t != '\0')
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action = S_CATCH;
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else
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action = S_IGN;
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if (rootshell && action == S_DFL) {
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switch (signo) {
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case SIGINT:
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if (iflag || minusc || sflag == 0)
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action = S_CATCH;
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break;
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case SIGQUIT:
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#if DEBUG
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if (debug)
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break;
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#endif
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/* FALLTHROUGH */
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case SIGTERM:
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if (iflag)
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action = S_IGN;
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break;
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#if JOBS
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case SIGTSTP:
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case SIGTTOU:
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if (mflag)
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action = S_IGN;
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break;
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#endif
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}
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}
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t = &sigmode[signo - 1];
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tsig = *t;
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if (tsig == 0) {
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/*
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* current setting unknown
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*/
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if (sigaction(signo, 0, &act) == -1) {
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/*
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* Pretend it worked; maybe we should give a warning
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* here, but other shells don't. We don't alter
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* sigmode, so that we retry every time.
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*/
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return;
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}
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if (act.sa_handler == SIG_IGN) {
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if (mflag
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&& (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
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) {
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tsig = S_IGN; /* don't hard ignore these */
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} else
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tsig = S_HARD_IGN;
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} else {
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tsig = S_RESET; /* force to be set */
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}
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}
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if (tsig == S_HARD_IGN || tsig == action)
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return;
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switch (action) {
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case S_CATCH:
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act.sa_handler = onsig;
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break;
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case S_IGN:
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act.sa_handler = SIG_IGN;
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break;
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default:
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act.sa_handler = SIG_DFL;
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}
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*t = action;
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act.sa_flags = 0;
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sigfillset(&act.sa_mask);
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sigaction(signo, &act, 0);
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}
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/*
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* Called to execute a trap. Perhaps we should avoid entering new trap
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* handlers while we are executing a trap handler.
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*/
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static int
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dotrap(void)
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{
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char *p;
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char *q;
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int i;
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int savestatus;
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int skip = 0;
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savestatus = exitstatus;
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pendingsigs = 0;
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xbarrier();
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for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) {
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if (!*q)
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continue;
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*q = '\0';
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p = trap[i + 1];
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if (!p)
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continue;
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skip = evalstring(p, SKIPEVAL);
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exitstatus = savestatus;
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if (skip)
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break;
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}
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return skip;
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}
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/* ============ Builtins */
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