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authorRich Felker <dalias@aerifal.cx>2011-05-08 00:03:00 -0400
committerRich Felker <dalias@aerifal.cx>2011-05-08 00:03:00 -0400
commit15b77d52c950c375514d2e8152e7112fd018e20e (patch)
tree709fcb0df148377a18251baa51348127c82ab6c6
parent11e4b92556a02f43b500e6815690354b0f710843 (diff)
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eventfd syscall wrapper and read/write wrappers
-rw-r--r--include/sys/eventfd.h25
-rw-r--r--src/linux/eventfd.c7
-rw-r--r--src/linux/eventfd_read.c7
-rw-r--r--src/linux/eventfd_write.c7
4 files changed, 46 insertions, 0 deletions
diff --git a/include/sys/eventfd.h b/include/sys/eventfd.h
new file mode 100644
index 00000000..13bc9c4c
--- /dev/null
+++ b/include/sys/eventfd.h
@@ -0,0 +1,25 @@
+#ifndef _SYS_EVENTFD_H
+#define _SYS_EVENTFD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+typedef uint64_t eventfd_t;
+
+#define EFD_SEMAPHORE 1
+#define EFD_CLOEXEC 02000000
+#define EFD_NONBLOCK 04000
+
+int eventfd(unsigned int, int);
+int eventfd_read(int, eventfd_t *);
+int eventfd_write(int, eventfd_t);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* sys/eventfd.h */
diff --git a/src/linux/eventfd.c b/src/linux/eventfd.c
new file mode 100644
index 00000000..cb39a7ba
--- /dev/null
+++ b/src/linux/eventfd.c
@@ -0,0 +1,7 @@
+#include <sys/eventfd.h>
+#include "syscall.h"
+
+int eventfd(unsigned int count, int flags)
+{
+	return syscall(flags ? SYS_eventfd2 : SYS_eventfd, count, flags);
+}
diff --git a/src/linux/eventfd_read.c b/src/linux/eventfd_read.c
new file mode 100644
index 00000000..969e6615
--- /dev/null
+++ b/src/linux/eventfd_read.c
@@ -0,0 +1,7 @@
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+int eventfd_read(int fd, eventfd_t *value)
+{
+	return (sizeof(*value) == read(fd, value, sizeof(*value))) ? 0 : -1;
+}
diff --git a/src/linux/eventfd_write.c b/src/linux/eventfd_write.c
new file mode 100644
index 00000000..734fa367
--- /dev/null
+++ b/src/linux/eventfd_write.c
@@ -0,0 +1,7 @@
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+int eventfd_write(int fd, eventfd_t value)
+{
+	return (sizeof(value) == write(fd, &value, sizeof(value))) ? 0 : -1;
+}