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 2b00f0d42e70c2213cd229fc6572c21edc21f51d..fb7ae20236557c7a8f5ce8eed385495b9da3ed6c 100644 (file)
--- 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 7494f80f4bf8358e13b556edeab1444435228805..4a748cd1b93546d00537d8f7d51057f8dcc401bf 100644 (file)
--- 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 */