X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Futils.c;h=d0c8dd16f62571618db8118759d7a8ee4e650a76;hp=ce2e97561f0170c3dbdb072370e79b1e5ec502ae;hb=ef599319218f03ff160778e577cd8389a165f47c;hpb=6364a07adde1072d595044a19359e61fc27940dd

diff --git a/src/bin/lttng-sessiond/utils.c b/src/bin/lttng-sessiond/utils.c
index ce2e97561..d0c8dd16f 100644
--- a/src/bin/lttng-sessiond/utils.c
+++ b/src/bin/lttng-sessiond/utils.c
@@ -18,6 +18,7 @@
 
 #define _GNU_SOURCE
 #include <errno.h>
+#include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -52,3 +53,77 @@ const char *get_home_dir(void)
 {
 	return ((const char *) getenv("HOME"));
 }
+
+/*
+ * Create a pipe in dst.
+ */
+int utils_create_pipe(int *dst)
+{
+	int ret;
+
+	if (dst == NULL) {
+		return -1;
+	}
+
+	ret = pipe(dst);
+	if (ret < 0) {
+		PERROR("create pipe");
+	}
+
+	return ret;
+}
+
+/*
+ * Create pipe and set CLOEXEC flag to both fd.
+ *
+ * Make sure the pipe opened by this function are closed at some point. Use
+ * utils_close_pipe().
+ */
+int utils_create_pipe_cloexec(int *dst)
+{
+	int ret, i;
+
+	if (dst == NULL) {
+		return -1;
+	}
+
+	ret = utils_create_pipe(dst);
+	if (ret < 0) {
+		goto error;
+	}
+
+	for (i = 0; i < 2; i++) {
+		ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC);
+		if (ret < 0) {
+			PERROR("fcntl pipe cloexec");
+			goto error;
+		}
+	}
+
+error:
+	return ret;
+}
+
+/*
+ * Close both read and write side of the pipe.
+ */
+void utils_close_pipe(int *src)
+{
+	int i, ret;
+
+	if (src == NULL) {
+		return;
+	}
+
+	for (i = 0; i < 2; i++) {
+		/* Safety check */
+		if (src[i] < 0) {
+			continue;
+		}
+
+		ret = close(src[i]);
+		if (ret) {
+			PERROR("close pipe");
+		}
+	}
+}