MINOR: init: report the haproxy version and executable path once on errors
If haproxy fails to start and emits an alert, then it can be useful
to have it also emit the version and the path used to load it. Some
users may be mistakenly launching the wrong binary due to a misconfigured
PATH variable and this will save them some troubleshooting time when it
reports that some keywords are not understood.
What we do here is that we *try* to extract the binary name from the
AUX vector on glibc, and we report this as a NOTICE tag before the
very first alert is emitted.
diff --git a/src/standard.c b/src/standard.c
index 3afaf5a..eba7910 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -16,6 +16,10 @@
#include <link.h>
#endif
+#if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16))
+#include <sys/auxv.h>
+#endif
+
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
@@ -4335,6 +4339,22 @@
}
}
+/* Tries to report the executable path name on platforms supporting this. If
+ * not found or not possible, returns NULL.
+ */
+const char *get_exec_path()
+{
+ const char *ret = NULL;
+
+#if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16))
+ long execfn = getauxval(AT_EXECFN);
+
+ if (execfn && execfn != ENOENT)
+ ret = (const char *)execfn;
+#endif
+ return ret;
+}
+
#ifdef __ELF__
/* calls dladdr() or dladdr1() on <addr> and <dli>. If dladdr1 is available,
* also returns the symbol size in <size>, otherwise returns 0 there.