diff --git a/lib/atoi/getnum.c b/lib/atoi/getnum.c
index 29e91581..1931c056 100644
--- a/lib/atoi/getnum.c
+++ b/lib/atoi/getnum.c
@@ -10,5 +10,6 @@
 #include "atoi/getnum.h"
 
 
+extern inline int get_fd(const char *restrict fdstr, int *restrict fd);
 extern inline int get_gid(const char *restrict gidstr, gid_t *restrict gid);
 extern inline int get_pid(const char *restrict pidstr, pid_t *restrict pid);
diff --git a/lib/atoi/getnum.h b/lib/atoi/getnum.h
index f92173fe..a459e909 100644
--- a/lib/atoi/getnum.h
+++ b/lib/atoi/getnum.h
@@ -9,6 +9,7 @@
 
 #include <config.h>
 
+#include <limits.h>
 #include <stddef.h>
 #include <sys/types.h>
 
@@ -17,12 +18,21 @@
 #include "typetraits.h"
 
 
+ATTR_STRING(1) ATTR_ACCESS(write_only, 2)
+inline int get_fd(const char *restrict fdstr, int *restrict fd);
 ATTR_STRING(1) ATTR_ACCESS(write_only, 2)
 inline int get_gid(const char *restrict gidstr, gid_t *restrict gid);
 ATTR_STRING(1) ATTR_ACCESS(write_only, 2)
 inline int get_pid(const char *restrict pidstr, pid_t *restrict pid);
 
 
+inline int
+get_fd(const char *restrict fdstr, int *restrict fd)
+{
+	return a2si(fd, fdstr, NULL, 10, 0, INT_MAX);
+}
+
+
 inline int
 get_gid(const char *restrict gidstr, gid_t *restrict gid)
 {