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Revert "unix: restore signal disposition to previous one (#4216)" (#4302)

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This reverts commit b9421d7066.

Refs: https://github.com/libuv/libuv/issues/4299
Refs: https://github.com/libuv/libuv/issues/4248
This commit is contained in:
Santiago Gimeno 2024-02-06 07:52:21 +01:00 committed by GitHub
parent 129362f356
commit 10f313631c
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GPG Key ID: B5690EEEBB952194
1 changed files with 5 additions and 27 deletions
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32
src/unix/signal.c
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@ -32,18 +32,11 @@
# 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);
@ -57,23 +50,11 @@ 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,
@ -243,7 +224,6 @@ 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));
@ -254,11 +234,10 @@ static int uv__signal_register_handler(int signum, int oneshot) {
if (oneshot)
sa.sa_flags |= SA_RESETHAND;
if (sigaction(signum, &sa, &sa_old))
/* XXX save old action so we can restore it later on? */
if (sigaction(signum, &sa, NULL))
return UV__ERR(errno);
uv__sigaction_set(signum, &sa_old);
return 0;
}
@ -266,10 +245,9 @@ 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;
assert(uv__sigaction_isset(signum));
sa = uv__sigactions.acts[signum];
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
/* sigaction can only fail with EINVAL or EFAULT; an attempt to deregister a
* signal implies that it was successfully registered earlier, so EINVAL