X-Git-Url: https://git.decadent.org.uk/gitweb/?a=blobdiff_plain;f=support%2Fnfs%2Fcloseall.c;fp=support%2Fnfs%2Fcloseall.c;h=cc7fb3bd86164cf775eb71b1951bf3b064f1ef51;hb=f73e7b9f69835d483cee95e6a20b6307b9d16b77;hp=0000000000000000000000000000000000000000;hpb=b51ebed58a610b3104e9f218d609715cd468b0ea;p=nfs-utils.git

diff --git a/support/nfs/closeall.c b/support/nfs/closeall.c
new file mode 100644
index 0000000..cc7fb3b
--- /dev/null
+++ b/support/nfs/closeall.c
@@ -0,0 +1,31 @@
+/*
+ * support/nfs/closeall.c
+ * Close all file descriptors greater than some limit,
+ * Use readdir "/proc/self/fd" to avoid excess close(2) calls.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <dirent.h>
+
+void
+closeall(int min)
+{
+	DIR *dir = opendir("/proc/self/fd");
+	if (dir != NULL) {
+		int dfd = dirfd(dir);
+		struct dirent *d;
+
+		while ((d = readdir(dir)) != NULL) {
+			char *endp;
+			long n = strtol(d->d_name, &endp, 10);
+			if (*endp != '\0' && n >= min && n != dfd)
+				(void) close(n);
+		}
+		closedir(dir);
+	} else {
+		int fd = sysconf(_SC_OPEN_MAX);
+		while (--fd >= min)
+			(void) close(fd);
+	}
+}