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unix: restore signal disposition to previous one (#4216)

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Fixes: https://github.com/libuv/libuv/issues/2435
This commit is contained in:
Viacheslav Muravyev 2023-11-15 20:39:17 +07:00 committed by GitHub
parent 54d8364c24
commit b9421d7066
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 27 additions and 5 deletions
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32
src/unix/signal.c
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@ -32,11 +32,18 @@
# define SA_RESTART 0
#endif
#define UV__NSIG 128
typedef struct {
uv_signal_t* handle;
int signum;
} uv__signal_msg_t;
typedef struct {
struct sigaction acts[UV__NSIG];
char acts_presented_flags[UV__NSIG];
} uv__sigactions_t;
RB_HEAD(uv__signal_tree_s, uv_signal_s);
@ -50,11 +57,23 @@ static int uv__signal_compare(uv_signal_t* w1, uv_signal_t* w2);
static void uv__signal_stop(uv_signal_t* handle);
static void uv__signal_unregister_handler(int signum);
static void uv__sigaction_set(int signum, struct sigaction *sa);
static int uv__sigaction_isset(int signum);
static uv_once_t uv__signal_global_init_guard = UV_ONCE_INIT;
static struct uv__signal_tree_s uv__signal_tree =
RB_INITIALIZER(uv__signal_tree);
static int uv__signal_lock_pipefd[2] = { -1, -1 };
static uv__sigactions_t uv__sigactions;
static void uv__sigaction_set(int signum, struct sigaction *sa) {
uv__sigactions.acts[signum] = *sa;
uv__sigactions.acts_presented_flags[signum] = 1;
}
static int uv__sigaction_isset(int signum) {
return uv__sigactions.acts_presented_flags[signum] == 0 ? 0 : 1;
}
RB_GENERATE_STATIC(uv__signal_tree_s,
uv_signal_s, tree_entry,
@ -224,6 +243,7 @@ static void uv__signal_handler(int signum) {
static int uv__signal_register_handler(int signum, int oneshot) {
/* When this function is called, the signal lock must be held. */
struct sigaction sa;
struct sigaction sa_old;
/* XXX use a separate signal stack? */
memset(&sa, 0, sizeof(sa));
@ -234,10 +254,11 @@ static int uv__signal_register_handler(int signum, int oneshot) {
if (oneshot)
sa.sa_flags |= SA_RESETHAND;
/* XXX save old action so we can restore it later on? */
if (sigaction(signum, &sa, NULL))
if (sigaction(signum, &sa, &sa_old))
return UV__ERR(errno);
uv__sigaction_set(signum, &sa_old);
return 0;
}
@ -245,9 +266,10 @@ static int uv__signal_register_handler(int signum, int oneshot) {
static void uv__signal_unregister_handler(int signum) {
/* When this function is called, the signal lock must be held. */
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
assert(uv__sigaction_isset(signum));
sa = uv__sigactions.acts[signum];
/* sigaction can only fail with EINVAL or EFAULT; an attempt to deregister a
* signal implies that it was successfully registered earlier, so EINVAL