xlat tables are generating in built-time of strace.
printxval is suitable for printing `family' field of Netlink GENERIC
protocol. However, contents of the xlat table cannot be defined in
build-time because the values for the field are given by Linux kernel.
dyxlat functions are for building xlat in run-time. Decoding the
field is the primary use case of functions but they can be used
another purpose.
* defs.h (dyxlat_alloc, dyxlat_free, dyxlat_add_pair): New functions
declarations.
(struct dyxlat): New opaque data type.
* dyxlat.c: New file.
Changes in version 3 (suggested by ldv):
* Rename dyxlat_new/dyxlat_delete to dyxlat_alloc/dyxlat_free.
Rename dyxlat_may_add_pair to dyxlat_may_add_pair.
* Move dyxlat declarations closer to other xlat related prototypes.
* Change the field types of dyxlat structure from int to size_t.
* Merge the file static functions in dyxlat.c to the exported functions
in the file.
Change in version 4 (suggested by ldv):
* (dyxlat_alloc) use "nmemb" instead of "allocation" as a parameter
name.
* Don't write parameters if their names and the names of their
type are the same.
* (dyxlat_get) add const modifier to the return type and the parameter.
* (dyxlat_add_pari) Specify the string length of value explicitly.
Use xstrndup internally.
* (dyxlat_alloc): Change the default nmemb to 16.
Extend the array when "used" is equal to greater than "allocated".
Update the xlat element before incrmenting "used" field.
Signed-off-by: Masatake YAMATO <yam...@redhat.com>
---
Makefile.am | 1 +
defs.h | 6 ++++
dyxlat.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 110 insertions(+)
create mode 100644 dyxlat.c
diff --git a/Makefile.am b/Makefile.am
index e22d480..f9e78ed 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -104,6 +104,7 @@ strace_SOURCES = \
dirent.c \
dirent64.c \
dm.c \
+ dyxlat.c \
empty.h \
epoll.c \
evdev.c \
diff --git a/defs.h b/defs.h
index 5e05457..f7b5709 100644
--- a/defs.h
+++ b/defs.h
@@ -508,6 +508,12 @@ extern enum sock_proto getfdproto(struct tcb *, int);
extern const char *xlookup(const struct xlat *, const uint64_t);
extern const char *xlat_search(const struct xlat *, const size_t, const
uint64_t);
+struct dyxlat;
+struct dyxlat *dyxlat_alloc(size_t nmemb);
+void dyxlat_free(struct dyxlat *);
+const struct xlat *dyxlat_get(const struct dyxlat *);
+void dyxlat_add_pair(struct dyxlat *, uint64_t val, const char *str, size_t
len);
+
extern unsigned long get_pagesize(void);
extern int
string_to_uint_ex(const char *str, char **endptr,
diff --git a/dyxlat.c b/dyxlat.c
new file mode 100644
index 0000000..a5c1495
--- /dev/null
+++ b/dyxlat.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2017 The strace developers.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "defs.h"
+
+struct dyxlat {
+ size_t used;
+ size_t allocated;
+ struct xlat *xlat;
+};
+
+#define MARK_END(xlat) \
+ do { \
+ (xlat).val = 0; \
+ (xlat).str = 0; \
+ } while (0)
+
+struct dyxlat *
+dyxlat_alloc(size_t nmemb)
+{
+ struct dyxlat *dyxlat;
+
+ dyxlat = xmalloc(sizeof(*dyxlat));
+
+ dyxlat->used = 1;
+ dyxlat->allocated = nmemb ? nmemb : 16;
+ dyxlat->xlat = xcalloc(dyxlat->allocated, sizeof(struct xlat));
+ MARK_END(dyxlat->xlat[0]);
+
+ return dyxlat;
+}
+
+void
+dyxlat_free(struct dyxlat *dyxlat)
+{
+ size_t i;
+
+ for (i = 0; i < dyxlat->used - 1; ++i) {
+ free((void *)(dyxlat->xlat[i].str));
+ dyxlat->xlat[i].str = NULL;
+ }
+
+ free(dyxlat->xlat);
+ dyxlat->xlat = NULL;
+ free(dyxlat);
+}
+
+const struct xlat *
+dyxlat_get(const struct dyxlat *dyxlat)
+{
+ return dyxlat->xlat;
+}
+
+void
+dyxlat_add_pair(struct dyxlat *dyxlat, uint64_t val, const char *str, size_t
len)
+{
+ size_t i;
+
+ for (i = 0; i < dyxlat->used - 1; i++) {
+ if (dyxlat->xlat[i].val == val) {
+ if (strncmp(dyxlat->xlat[i].str, str, len) == 0)
+ return;
+
+ free((void *)(dyxlat->xlat[i].str));
+ dyxlat->xlat[i].str = xstrndup(str, len);
+ return;
+ }
+ }
+
+ if (dyxlat->used >= dyxlat->allocated) {
+ dyxlat->allocated *= 2;
+ dyxlat->xlat = xreallocarray(dyxlat->xlat, dyxlat->allocated,
+ sizeof(struct xlat));
+ }
+
+ dyxlat->xlat[dyxlat->used - 1].val = val;
+ dyxlat->xlat[dyxlat->used - 1].str = xstrndup(str, len);
+ MARK_END(dyxlat->xlat[dyxlat->used]);
+ dyxlat->used++;
+}
--
2.9.4
------------------------------------------------------------------------------
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