From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 30 Oct 2019 15:29:42 +0000 (+0100)
Subject: missing: add rt_sigqueueinfo() syscall definition
X-Git-Tag: v245-rc1~315^2~10
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5ead4e85f6b58a099269b27def1cd03c4526ae19;p=thirdparty%2Fsystemd.git

missing: add rt_sigqueueinfo() syscall definition

This is not a new system call at all (since kernel 2.2), however it's
not exposed in glibc (a wrapper is exposed however in sigqueue(), but it
substantially simplifies the system call). Since we want a nice fallback
for sending signals on non-pidfd systems for pidfd_send_signal() let's
wrap rt_sigqueueinfo() since it takes the same siginfo_t parameter.
---

diff --git a/meson.build b/meson.build
index edde42ea74a..3085af49fd7 100644
--- a/meson.build
+++ b/meson.build
@@ -525,6 +525,10 @@ foreach ident : [
                                  #include <unistd.h>
                                  #include <signal.h>
                                  #include <sys/wait.h>'''],
+        ['rt_sigqueueinfo',   '''#include <stdlib.h>
+                                 #include <unistd.h>
+                                 #include <signal.h>
+                                 #include <sys/wait.h>'''],
 ]
 
         have = cc.has_function(ident[0], prefix : ident[1], args : '-D_GNU_SOURCE')
diff --git a/src/basic/missing_syscall.h b/src/basic/missing_syscall.h
index bea7be699d4..cbda3f7c605 100644
--- a/src/basic/missing_syscall.h
+++ b/src/basic/missing_syscall.h
@@ -562,3 +562,9 @@ static inline int pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned f
 #endif
 }
 #endif
+
+#if !HAVE_RT_SIGQUEUEINFO
+static inline int rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info) {
+        return syscall(__NR_rt_sigqueueinfo, tgid, sig, info);
+}
+#endif