[PATCH] handle libc implemntations which do not provide `error.h`
Saleem Abdulrasool
abdulras@google.com
Fri Aug 20 18:23:00 GMT 2021
Introduce a configure time check for the presence of `error.h`. In the
case that `error.h` is not available, we can fall back to `err.h`.
Although `err.h` is not a C standard header (it is a BSD extension),
many libc implementations provide. If there are targets which do not
provide an implementation of `err.h`, it would be possible to further
extend the implementation to be more portable.
This resolves PR21008.
Signed-off-by: Saleem Abdulrasool <abdulras@google.com>
---
configure.ac | 3 +++
lib/system.h | 23 ++++++++++++++++++++++-
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 7caff2c5..177bb1a2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -431,6 +431,9 @@ AC_CHECK_DECLS([reallocarray],[],[],
AC_CHECK_FUNCS([process_vm_readv])
+AC_CHECK_HEADERS([error.h])
+AC_CHECK_HEADERS([err.h])
+
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -D_GNU_SOURCE"
AC_FUNC_STRERROR_R()
diff --git a/lib/system.h b/lib/system.h
index 58d9deee..8adb5848 100644
--- a/lib/system.h
+++ b/lib/system.h
@@ -29,8 +29,9 @@
#ifndef LIB_SYSTEM_H
#define LIB_SYSTEM_H 1
+#include <config.h>
+
#include <errno.h>
-#include <error.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/param.h>
@@ -40,6 +41,26 @@
#include <string.h>
#include <stdlib.h>
+#if defined(HAVE_ERROR_H)
+#include <error.h>
+#elif defined(HAVE_ERR_H)
+static int error_message_count = 0;
+
+static inline void error(int status, int errnum, const char *format, ...) {
+ va_list argp;
+
+ va_start(argp, format);
+ verr(status, format, argp);
+ va_end(argp);
+
+ if (status)
+ exit(status);
+ ++error_message_count;
+}
+#else
+#error "err.h or error.h must be available"
+#endif
+
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define LE32(n) (n)
# define LE64(n) (n)
--
2.33.0.rc2.250.ged5fa647cd-goog
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