1 files changed, 87 insertions, 0 deletions
diff --git a/lib/ccan/err/err.h b/lib/ccan/err/err.h
new file mode 100644
index 0000000000..58ad91c728
--- /dev/null
+++ b/lib/ccan/err/err.h
@@ -0,0 +1,87 @@
+#ifndef CCAN_ERR_H
+#define CCAN_ERR_H
+#include "config.h"
+
+#if HAVE_ERR_H
+#include <err.h>
+
+/* This is unnecessary with a real err.h.  See below */
+#define err_set_progname(name) ((void)name)
+
+#else
+#include <ccan/compiler/compiler.h>
+
+/**
+ * err_set_progname - set the program name
+ * @name: the name to use for err, errx, warn and warnx
+ *
+ * The BSD err.h calls know the program name, unfortunately there's no
+ * portable way for the CCAN replacements to do that on other systems.
+ *
+ * If you don't call this with argv[0], it will be "unknown program".
+ *
+ * Example:
+ *	err_set_progname(argv[0]);
+ */
+void err_set_progname(const char *name);
+
+/**
+ * err - exit(eval) with message based on format and errno.
+ * @eval: the exit code
+ * @fmt: the printf-style format string
+ *
+ * The format string is printed to stderr like so:
+ *	<executable name>: <format>: <strerror(errno)>\n
+ *
+ * Example:
+ *	char *p = strdup("hello");
+ *	if (!p)
+ *		err(1, "Failed to strdup 'hello'");
+ */
+void NORETURN err(int eval, const char *fmt, ...);
+
+/**
+ * errx - exit(eval) with message based on format.
+ * @eval: the exit code
+ * @fmt: the printf-style format string
+ *
+ * The format string is printed to stderr like so:
+ *	<executable name>: <format>\n
+ *
+ * Example:
+ *	if (argc != 1)
+ *		errx(1, "I don't expect any arguments");
+ */
+void NORETURN errx(int eval, const char *fmt, ...);
+
+/**
+ * warn - print a message to stderr based on format and errno.
+ * @eval: the exit code
+ * @fmt: the printf-style format string
+ *
+ * The format string is printed to stderr like so:
+ *	<executable name>: <format>: <strerror(errno)>\n
+ *
+ * Example:
+ *	char *p = strdup("hello");
+ *	if (!p)
+ *		warn("Failed to strdup 'hello'");
+ */
+void warn(const char *fmt, ...);
+
+/**
+ * warnx - print a message to stderr based on format.
+ * @eval: the exit code
+ * @fmt: the printf-style format string
+ *
+ * The format string is printed to stderr like so:
+ *	<executable name>: <format>\n
+ *
+ * Example:
+ *	if (argc != 1)
+ *		warnx("I don't expect any arguments (ignoring)");
+ */
+void warnx(const char *fmt, ...);
+#endif
+
+#endif /* CCAN_ERR_H */