krb5 commit: Bump bundled libverto for 0.3.0 release

https://github.com/krb5/krb5/commit/e690f1b5691edf87b6c8a92eab95db5cfaee01d3
commit e690f1b5691edf87b6c8a92eab95db5cfaee01d3
Author: Robbie Harwood <[email protected]>
Date:   Thu Aug 31 16:49:17 2017 -0400

    Bump bundled libverto for 0.3.0 release
    
    Local changes:
      - Update upstream URL for fedorahosted deprecation.
      - Add verto_cleanup() to exports.
    
    Upstream changes:
      - Strict c89 compliance.
      - Remove local asprintf() implementation.
      - Fix memleak when memory allocator is realloc().
      - Fix leaks of filenames during load.
      - Fix many unused variable warnings.
      - Factor out mutability check.
      - Properly handle _GNU_SOURCE checking.
    
    ticket: 8612 (new)

 src/util/verto/README           |    2 +-
 src/util/verto/libverto.exports |    1 +
 src/util/verto/verto-k5ev.c     |    5 ++
 src/util/verto/verto-libev.c    |    5 ++
 src/util/verto/verto.c          |  131 ++++++++++++++++++++++++++++-----------
 src/util/verto/verto.h          |   20 +++++-
 6 files changed, 125 insertions(+), 39 deletions(-)

diff --git a/src/util/verto/README b/src/util/verto/README
index 6de645f..a3dab83 100644
--- a/src/util/verto/README
+++ b/src/util/verto/README
@@ -36,5 +36,5 @@ BUILTIN_MODULE define.
 
 The libverto and libev upstream project pages are at:
 
-  https://fedorahosted.org/libverto/
+  https://github.com/latchset/libverto/
   http://software.schmorp.de/pkg/libev.html
diff --git a/src/util/verto/libverto.exports b/src/util/verto/libverto.exports
index ecba76a..3745d50 100644
--- a/src/util/verto/libverto.exports
+++ b/src/util/verto/libverto.exports
@@ -4,6 +4,7 @@ verto_add_io
 verto_add_signal
 verto_add_timeout
 verto_break
+verto_cleanup
 verto_convert_module
 verto_default
 verto_del
diff --git a/src/util/verto/verto-k5ev.c b/src/util/verto/verto-k5ev.c
index 3f08275..a390af7 100644
--- a/src/util/verto/verto-k5ev.c
+++ b/src/util/verto/verto-k5ev.c
@@ -114,6 +114,11 @@ libev_callback(EV_P_ ev_watcher *w, int revents)
 {
     verto_ev_flag state = VERTO_EV_FLAG_NONE;
 
+#if EV_MULTIPLICITY
+    /* Match the check in ev.h, which doesn't mark this unused */
+    (void) EV_A;
+#endif
+
     if (verto_get_type(w->data)== VERTO_EV_TYPE_CHILD)
         verto_set_proc_status(w->data, ((ev_child*) w)->rstatus);
 
diff --git a/src/util/verto/verto-libev.c b/src/util/verto/verto-libev.c
index 9c7c324..99256a2 100644
--- a/src/util/verto/verto-libev.c
+++ b/src/util/verto/verto-libev.c
@@ -80,6 +80,11 @@ libev_callback(EV_P_ ev_watcher *w, int revents)
 {
     verto_ev_flag state = VERTO_EV_FLAG_NONE;
 
+#if EV_MULTIPLICITY
+    /* Match the check in ev.h, which doesn't mark this unused */
+    (void) EV_A;
+#endif
+
     if (verto_get_type(w->data)== VERTO_EV_TYPE_CHILD)
         verto_set_proc_status(w->data, ((ev_child*) w)->rstatus);
 
diff --git a/src/util/verto/verto.c b/src/util/verto/verto.c
index 44ea437..71eaffa 100644
--- a/src/util/verto/verto.c
+++ b/src/util/verto/verto.c
@@ -22,8 +22,6 @@
  * SOFTWARE.
  */
 
-#define _GNU_SOURCE /* For asprintf() */
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -45,6 +43,8 @@
 #define  _str(s) # s
 #define __str(s) _str(s)
 
+#define MUTABLE(flags) (flags & _VERTO_EV_FLAG_MUTABLE_MASK)
+
 /* Remove flags we can emulate */
 #define make_actual(flags) ((flags) & ~(VERTO_EV_FLAG_PERSIST|VERTO_EV_FLAG_IO_CLOSE_FD))
 
@@ -103,7 +103,7 @@ struct module_record {
 /*
  * This symbol can be used when embedding verto.c in a library along with a
  * built-in private module, to preload the module instead of dynamically
- * linking it in later.  Define to verto_module_table_<modulename>.
+ * linking it in later.  Define to <modulename>.
  */
 extern verto_module MODTABLE(BUILTIN_MODULE);
 static module_record builtin_record = {
@@ -119,12 +119,43 @@ static int resize_cb_hierarchical;
 
 #ifdef HAVE_PTHREAD
 static pthread_mutex_t loaded_modules_mutex = PTHREAD_MUTEX_INITIALIZER;
-#define mutex_lock(x) pthread_mutex_lock(x)
-#define mutex_unlock(x) pthread_mutex_unlock(x)
-#else
+
+#ifndef NDEBUG
+#define mutex_lock(x) { \
+        int c = pthread_mutex_lock(x); \
+        if (c != 0) { \
+            fprintf(stderr, "pthread_mutex_lock returned %d (%s) in %s", \
+                    c, strerror(c), __FUNCTION__); \
+        } \
+        assert(c == 0); \
+    }
+#define mutex_unlock(x) { \
+        int c = pthread_mutex_unlock(x); \
+        if (c != 0) { \
+            fprintf(stderr, "pthread_mutex_unlock returned %d (%s) in %s", \
+                    c, strerror(c), __FUNCTION__); \
+        } \
+        assert(c == 0); \
+    }
+#define mutex_destroy(x) { \
+        int c = pthread_mutex_destroy(x); \
+        if (c != 0) { \
+            fprintf(stderr, "pthread_mutex_destroy returned %d (%s) in %s", \
+                    c, strerror(c), __FUNCTION__); \
+        } \
+        assert(c == 0); \
+    }
+#else /* NDEBUG */
+#define mutex_lock pthread_mutex_lock
+#define mutex_unlock pthread_mutex_unlock
+#define mutex_destroy pthread_mutex_destroy
+#endif /* NDEBUG */
+
+#else /* HAVE_PTHREAD */
 #define mutex_lock(x)
 #define mutex_unlock(x)
-#endif
+#define mutex_destroy(x)
+#endif /* HAVE_PTHREAD */
 
 #define vfree(mem) vresize(mem, 0)
 static void *
@@ -132,34 +163,35 @@ vresize(void *mem, size_t size)
 {
     if (!resize_cb)
         resize_cb = &realloc;
+    if (size == 0 && resize_cb == &realloc) {
+        /* Avoid memleak as realloc(X, 0) can return a free-able pointer. */
+        free(mem);
+        return NULL;
+    }
     return (*resize_cb)(mem, size);
 }
 
 #ifndef BUILTIN_MODULE
-static int
-int_vasprintf(char **strp, const char *fmt, va_list ap) {
-    va_list apc;
-    int size = 0;
-
-    va_copy(apc, ap);
-    size = vsnprintf(NULL, 0, fmt, apc);
-    va_end(apc);
+static char *
+string_aconcat(const char *first, const char *second, const char *third) {
+    char *ret;
+    size_t len;
 
-    if (size <= 0 || !(*strp = malloc(size + 1)))
-        return -1;
+    len = strlen(first) + strlen(second);
+    if (third)
+        len += strlen(third);
 
-    return vsnprintf(*strp, size + 1, fmt, ap);
-}
+    ret = malloc(len + 1);
+    if (!ret)
+        return NULL;
 
-static int
-int_asprintf(char **strp, const char *fmt, ...) {
-    va_list ap;
-    int size = 0;
+    strncpy(ret, first, strlen(first));
+    strncpy(ret + strlen(first), second, strlen(second));
+    if (third)
+        strncpy(ret + strlen(first) + strlen(second), third, strlen(third));
 
-    va_start(ap, fmt);
-    size = int_vasprintf(strp, fmt, ap);
-    va_end(ap);
-    return size;
+    ret[len] = '\0';
+    return ret;
 }
 
 static char *
@@ -185,8 +217,7 @@ int_get_table_name_from_filename(const char *filename)
     if (tmp) {
         if (strchr(tmp+1, '.')) {
             *strchr(tmp+1, '.') = '\0';
-            if (int_asprintf(&tmp, "%s%s", __str(VERTO_MODULE_TABLE()), tmp + 1) < 0)
-                tmp = NULL;
+            tmp = string_aconcat(__str(VERTO_MODULE_TABLE()), tmp + 1, NULL);
         } else
             tmp = NULL;
     }
@@ -217,7 +248,7 @@ shouldload(void *symb, void *misc, char **err)
     if (table->symb && data->reqsym
             && !module_symbol_is_present(NULL, table->symb)) {
         if (err)
-            int_asprintf(err, "Symbol not found: %s!", table->symb);
+            *err = string_aconcat("Symbol not found: ", table->symb, "!");
         return 0;
     }
 
@@ -265,6 +296,7 @@ do_load_file(const char *filename, int reqsym, verto_ev_type reqtypes,
     tblname = int_get_table_name_from_filename(filename);
     if (!tblname) {
         free(tblname);
+        free(tmp->filename);
         vfree(tmp);
         return 0;
     }
@@ -278,6 +310,7 @@ do_load_file(const char *filename, int reqsym, verto_ev_type reqtypes,
         free(error);
         module_close(tmp->dll);
         free(tblname);
+        free(tmp->filename);
         vfree(tmp);
         return 0;
     }
@@ -324,7 +357,8 @@ do_load_dir(const char *dirname, const char *prefix, const char *suffix,
         if (flen < slen || strcmp(ent->d_name + flen - slen, suffix))
             continue;
 
-        if (int_asprintf(&tmp, "%s/%s", dirname, ent->d_name) < 0)
+        tmp = string_aconcat(dirname, "/", ent->d_name);
+        if (!tmp)
             continue;
 
         success = do_load_file(tmp, reqsym, reqtypes, record);
@@ -401,8 +435,8 @@ load_module(const char *impl, verto_ev_type reqtypes, module_record **record)
             success = do_load_file(impl, 0, reqtypes, record);
         if (!success) {
             /* Try to do a load by the name */
-            tmp = NULL;
-            if (int_asprintf(&tmp, "%s%s%s", prefix, impl, suffix) > 0) {
+            tmp = string_aconcat(prefix, impl, suffix);
+            if (tmp) {
                 success = do_load_file(tmp, 0, reqtypes, record);
                 free(tmp);
             }
@@ -494,6 +528,8 @@ remove_ev(verto_ev **origin, verto_ev *item)
 static void
 signal_ignore(verto_ctx *ctx, verto_ev *ev)
 {
+    (void) ctx;
+    (void) ev;
 }
 
 verto_ctx *
@@ -566,6 +602,25 @@ verto_free(verto_ctx *ctx)
 }
 
 void
+verto_cleanup(void)
+{
+    module_record *record;
+
+    mutex_lock(&loaded_modules_mutex);
+
+    for (record = loaded_modules; record; record = record->next) {
+        module_close(record->dll);
+        free(record->filename);
+    }
+
+    vfree(loaded_modules);
+    loaded_modules = NULL;
+
+    mutex_unlock(&loaded_modules_mutex);
+    mutex_destroy(&loaded_modules_mutex);
+}
+
+void
 verto_run(verto_ctx *ctx)
 {
     if (!ctx)
@@ -752,8 +807,12 @@ verto_set_flags(verto_ev *ev, verto_ev_flag flags)
     if (!ev)
         return;
 
+    /* No modification is needed, so do nothing. */
+    if (MUTABLE(ev->flags) == MUTABLE(flags))
+        return;
+
     ev->flags  &= ~_VERTO_EV_FLAG_MUTABLE_MASK;
-    ev->flags  |= flags & _VERTO_EV_FLAG_MUTABLE_MASK;
+    ev->flags  |= MUTABLE(flags);
 
     /* If setting flags isn't supported, just rebuild the event */
     if (!ev->ctx->module->funcs->ctx_set_flags) {
@@ -765,7 +824,7 @@ verto_set_flags(verto_ev *ev, verto_ev_flag flags)
     }
 
     ev->actual &= ~_VERTO_EV_FLAG_MUTABLE_MASK;
-    ev->actual |= flags & _VERTO_EV_FLAG_MUTABLE_MASK;
+    ev->actual |= MUTABLE(flags);
     ev->ctx->module->funcs->ctx_set_flags(ev->ctx->ctx, ev, ev->ev);
 }
 
@@ -861,7 +920,7 @@ verto_convert_module(const verto_module *module, int deflt, verto_mod_ctx *mctx)
     module_record *mr;
 
     if (!module)
-        goto error;
+        return NULL;
 
     if (deflt) {
         mutex_lock(&loaded_modules_mutex);
diff --git a/src/util/verto/verto.h b/src/util/verto/verto.h
index 5540367..55c5836 100644
--- a/src/util/verto/verto.h
+++ b/src/util/verto/verto.h
@@ -33,6 +33,7 @@
 typedef HANDLE verto_proc;
 typedef DWORD verto_proc_status;
 #else
+#include <sys/types.h>
 typedef pid_t verto_proc;
 typedef int verto_proc_status;
 #endif
@@ -195,7 +196,8 @@ verto_set_default(const char *impl, verto_ev_type reqtypes);
  * @see verto_add_idle()
  * @see verto_add_signal()
  * @see verto_add_child()
- * @param resize The allocator to use (behaves like realloc())
+ * @param resize The allocator to use (behaves like realloc();
+ *        resize(ptr, 0) must free memory at ptr.)
  * @param hierarchical Zero if the allocator is not hierarchical
  */
 int
@@ -216,6 +218,19 @@ void
 verto_free(verto_ctx *ctx);
 
 /**
+ * Frees global state.
+ *
+ * Remove and free all allocated global state.  Call only when no further
+ * contexts exist and all threads have exited.
+ *
+ * @see verto_new()
+ * @see verto_free()
+ * @see verto_default()
+ */
+void
+verto_cleanup(void);
+
+/**
  * Run the verto_ctx forever, or at least until verto_break() is called.
  *
  * @see verto_break()
@@ -444,7 +459,8 @@ verto_get_flags(const verto_ev *ev);
  * Sets the flags associated with the given verto_ev.
  *
  * See _VERTO_EV_FLAG_MUTABLE_MASK for the flags that can be changed
- * with this function. All others will be ignored.
+ * with this function. All others will be ignored. If the flags specified
+ * are the same as the flags the event already has, this function is a no-op.
  *
  * @see verto_add_io()
  * @see verto_add_timeout()