From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Sun, 1 Jul 2018 10:05:31 +0000 (+0200)
Subject: utils: add fd_cloexec()
X-Git-Tag: lxc-3.1.0~224^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9d4ebc1684044eccd7f9f50ad66cacd46e459b1;p=thirdparty%2Flxc.git

utils: add fd_cloexec()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Wolfgang Bumiller <w.bumiller@proxmox.com>
---

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 2b00f0d42..fb7ae2023 100644
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -2686,3 +2686,25 @@ void remove_trailing_newlines(char *l)
 	while (--p >= l && *p == '\n')
 		*p = '\0';
 }
+
+int fd_cloexec(int fd, bool cloexec)
+{
+	int oflags, nflags;
+
+	oflags = fcntl(fd, F_GETFD, 0);
+	if (oflags < 0)
+		return -errno;
+
+	if (cloexec)
+		nflags = oflags | FD_CLOEXEC;
+	else
+		nflags = oflags & ~FD_CLOEXEC;
+
+	if (nflags == oflags)
+		return 0;
+
+	if (fcntl(fd, F_SETFD, nflags) < 0)
+		return -errno;
+
+	return 0;
+}
diff --git a/src/lxc/utils.h b/src/lxc/utils.h
index 7494f80f4..4a748cd1b 100644
--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -615,5 +615,6 @@ static inline pid_t lxc_raw_gettid(void)
 
 /* Set a signal the child process will receive after the parent has died. */
 extern int lxc_set_death_signal(int signal);
+extern int fd_cloexec(int fd, bool cloexec);
 
 #endif /* __LXC_UTILS_H */