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authorLennart Poettering <lennart@poettering.net>2015-05-31 23:21:48 +0200
committerLennart Poettering <lennart@poettering.net>2015-06-10 01:28:58 +0200
commit0c2c2a3aeb4c348e41d5d634c397faa3aa35cba7 (patch)
treefc2e7d3216558f49f33d09dfe71aff239ffd0c10 /src/shared/signal-util.c
parentd93bcf29b82ee424ee9ec452c8b667fdd818a06b (diff)
signal-util: modernize and share more code
Diffstat (limited to 'src/shared/signal-util.c')
-rw-r--r--src/shared/signal-util.c104
1 files changed, 72 insertions, 32 deletions
diff --git a/src/shared/signal-util.c b/src/shared/signal-util.c
index 9a2973b6fd..84cf42b285 100644
--- a/src/shared/signal-util.c
+++ b/src/shared/signal-util.c
@@ -23,13 +23,13 @@
#include "signal-util.h"
int reset_all_signal_handlers(void) {
+ static const struct sigaction sa = {
+ .sa_handler = SIG_DFL,
+ .sa_flags = SA_RESTART,
+ };
int sig, r = 0;
for (sig = 1; sig < _NSIG; sig++) {
- static const struct sigaction sa = {
- .sa_handler = SIG_DFL,
- .sa_flags = SA_RESTART,
- };
/* These two cannot be caught... */
if (sig == SIGKILL || sig == SIGSTOP)
@@ -38,7 +38,7 @@ int reset_all_signal_handlers(void) {
/* On Linux the first two RT signals are reserved by
* glibc, and sigaction() will return EINVAL for them. */
if ((sigaction(sig, &sa, NULL) < 0))
- if (errno != EINVAL && r == 0)
+ if (errno != EINVAL && r >= 0)
r = -errno;
}
@@ -57,83 +57,123 @@ int reset_signal_mask(void) {
return 0;
}
+static int sigaction_many_ap(const struct sigaction *sa, int sig, va_list ap) {
+ int r = 0;
+
+ /* negative signal ends the list. 0 signal is skipped. */
+
+ if (sig < 0)
+ return 0;
+
+ if (sig > 0) {
+ if (sigaction(sig, sa, NULL) < 0)
+ r = -errno;
+ }
+
+ while ((sig = va_arg(ap, int)) >= 0) {
+
+ if (sig == 0)
+ continue;
+
+ if (sigaction(sig, sa, NULL) < 0) {
+ if (r >= 0)
+ r = -errno;
+ }
+ }
+
+ return r;
+}
+
int sigaction_many(const struct sigaction *sa, ...) {
va_list ap;
- int r = 0, sig;
+ int r;
va_start(ap, sa);
- while ((sig = va_arg(ap, int)) > 0)
- if (sigaction(sig, sa, NULL) < 0)
- r = -errno;
+ r = sigaction_many_ap(sa, 0, ap);
va_end(ap);
return r;
}
int ignore_signals(int sig, ...) {
+
static const struct sigaction sa = {
.sa_handler = SIG_IGN,
.sa_flags = SA_RESTART,
};
- va_list ap;
- int r = 0;
- if (sigaction(sig, &sa, NULL) < 0)
- r = -errno;
+ va_list ap;
+ int r;
va_start(ap, sig);
- while ((sig = va_arg(ap, int)) > 0)
- if (sigaction(sig, &sa, NULL) < 0)
- r = -errno;
+ r = sigaction_many_ap(&sa, sig, ap);
va_end(ap);
return r;
}
int default_signals(int sig, ...) {
+
static const struct sigaction sa = {
.sa_handler = SIG_DFL,
.sa_flags = SA_RESTART,
};
- va_list ap;
- int r = 0;
- if (sigaction(sig, &sa, NULL) < 0)
- r = -errno;
+ va_list ap;
+ int r;
va_start(ap, sig);
- while ((sig = va_arg(ap, int)) > 0)
- if (sigaction(sig, &sa, NULL) < 0)
- r = -errno;
+ r = sigaction_many_ap(&sa, sig, ap);
va_end(ap);
return r;
}
-void sigset_add_many(sigset_t *ss, ...) {
- va_list ap;
- int sig;
+static int sigset_add_many_ap(sigset_t *ss, va_list ap) {
+ int sig, r = 0;
assert(ss);
+ while ((sig = va_arg(ap, int)) >= 0) {
+
+ if (sig == 0)
+ continue;
+
+ if (sigaddset(ss, sig) < 0) {
+ if (r >= 0)
+ r = -errno;
+ }
+ }
+
+ return r;
+}
+
+int sigset_add_many(sigset_t *ss, ...) {
+ va_list ap;
+ int r;
+
va_start(ap, ss);
- while ((sig = va_arg(ap, int)) > 0)
- assert_se(sigaddset(ss, sig) == 0);
+ r = sigset_add_many_ap(ss, ap);
va_end(ap);
+
+ return r;
}
int sigprocmask_many(int how, ...) {
va_list ap;
sigset_t ss;
- int sig;
+ int r;
- assert_se(sigemptyset(&ss) == 0);
+ if (sigemptyset(&ss) < 0)
+ return -errno;
va_start(ap, how);
- while ((sig = va_arg(ap, int)) > 0)
- assert_se(sigaddset(&ss, sig) == 0);
+ r = sigset_add_many_ap(&ss, ap);
va_end(ap);
+ if (r < 0)
+ return r;
+
if (sigprocmask(how, &ss, NULL) < 0)
return -errno;