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[xen master] tools/xenstore: replace xs_lib.c with a header



commit b2126a992fe2607c3ec78b7b8ab3d0bd9d559eea
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Jun 27 14:27:47 2023 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Jun 29 22:38:22 2023 +0100

    tools/xenstore: replace xs_lib.c with a header
    
    Instead of including the same small C source in multiple binaries from
    2 source directories, use a header file with inline functions as a
    replacement.
    
    As some of the functions are exported by libxenstore, rename the inline
    functions from xs_*() do xenstore_*() and add xs_*() wrappers to
    libxenstore.
    
    With that no sources required to build libxenstore are left in
    tools/xenstore, so the file COPYING can be removed now.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 MAINTAINERS                               |   1 +
 tools/include/xen-tools/xenstore-common.h | 128 ++++++++
 tools/libs/store/Makefile                 |   4 -
 tools/libs/store/xs.c                     |  28 +-
 tools/xenstore/COPYING                    | 514 ------------------------------
 tools/xenstore/Makefile                   |   2 +-
 tools/xenstore/Makefile.common            |   2 +-
 tools/xenstore/xenstore_client.c          |   4 +-
 tools/xenstore/xenstored_control.c        |   9 +-
 tools/xenstore/xenstored_core.c           |  15 +-
 tools/xenstore/xs_lib.c                   | 126 --------
 tools/xenstore/xs_lib.h                   |  31 --
 12 files changed, 168 insertions(+), 696 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 64c9cc89ed..180e57dac4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -660,6 +660,7 @@ F:  tools/helpers/init-xenstore-domain.c
 F:     tools/include/xenstore-compat/
 F:     tools/include/xenstore.h
 F:     tools/include/xenstore_lib.h
+F:     tools/include/xen-tools/xenstore-common.h
 F:     tools/libs/store/
 F:     tools/xenstore/
 
diff --git a/tools/include/xen-tools/xenstore-common.h 
b/tools/include/xen-tools/xenstore-common.h
new file mode 100644
index 0000000000..8cb097a8fc
--- /dev/null
+++ b/tools/include/xen-tools/xenstore-common.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/* Common functions for libxenstore, xenstored and xenstore-clients. */
+
+#ifndef __XEN_TOOLS_XENSTORE_COMMON__
+#define __XEN_TOOLS_XENSTORE_COMMON__
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <xenstore_lib.h>
+
+static inline const char *xenstore_daemon_rundir(void)
+{
+    char *s = getenv("XENSTORED_RUNDIR");
+
+    return s ? s : XEN_RUN_STORED;
+}
+
+static inline const char *xenstore_daemon_path(void)
+{
+    static char buf[PATH_MAX];
+    char *s = getenv("XENSTORED_PATH");
+
+    if ( s )
+        return s;
+
+    if ( snprintf(buf, sizeof(buf), "%s/socket", xenstore_daemon_rundir()) >=
+         PATH_MAX )
+        return NULL;
+
+    return buf;
+}
+
+/* Convert strings to permissions.  False if a problem. */
+static inline bool xenstore_strings_to_perms(struct xs_permissions *perms,
+                                             unsigned int num,
+                                             const char *strings)
+{
+    const char *p;
+    char *end;
+    unsigned int i;
+
+    for ( p = strings, i = 0; i < num; i++ )
+    {
+        /* "r", "w", or "b" for both. */
+        switch ( *p )
+        {
+        case 'r':
+            perms[i].perms = XS_PERM_READ;
+            break;
+
+        case 'w':
+            perms[i].perms = XS_PERM_WRITE;
+            break;
+
+        case 'b':
+            perms[i].perms = XS_PERM_READ|XS_PERM_WRITE;
+            break;
+
+        case 'n':
+            perms[i].perms = XS_PERM_NONE;
+            break;
+
+        default:
+            errno = EINVAL;
+            return false;
+        }
+
+        p++;
+        perms[i].id = strtol(p, &end, 0);
+        if ( *end || !*p )
+        {
+            errno = EINVAL;
+            return false;
+        }
+
+        p = end + 1;
+    }
+
+    return true;
+}
+
+/* Convert permissions to a string (up to len MAX_STRLEN(unsigned int)+1). */
+static inline bool xenstore_perm_to_string(const struct xs_permissions *perm,
+                                           char *buffer, size_t buf_len)
+{
+    switch ( (int)perm->perms & ~XS_PERM_IGNORE )
+    {
+    case XS_PERM_WRITE:
+        *buffer = 'w';
+        break;
+
+    case XS_PERM_READ:
+        *buffer = 'r';
+        break;
+
+    case XS_PERM_READ|XS_PERM_WRITE:
+        *buffer = 'b';
+        break;
+
+    case XS_PERM_NONE:
+        *buffer = 'n';
+        break;
+
+    default:
+        errno = EINVAL;
+        return false;
+    }
+
+    snprintf(buffer + 1, buf_len - 1, "%i", (int)perm->id);
+
+    return true;
+}
+
+/* Given a string and a length, count how many strings (nul terms). */
+static inline unsigned int xenstore_count_strings(const char *strings,
+                                                  unsigned int len)
+{
+    unsigned int num;
+    const char *p;
+
+    for ( p = strings, num = 0; p < strings + len; p++ )
+        if ( *p == '\0' )
+            num++;
+
+    return num;
+}
+#endif /* __XEN_TOOLS_XENSTORE_COMMON__ */
diff --git a/tools/libs/store/Makefile b/tools/libs/store/Makefile
index daed9d148f..c1a1508713 100644
--- a/tools/libs/store/Makefile
+++ b/tools/libs/store/Makefile
@@ -9,7 +9,6 @@ ifeq ($(CONFIG_Linux),y)
 LDLIBS += -ldl
 endif
 
-OBJS-y   += xs_lib.o
 OBJS-y   += xs.o
 
 LIBHEADER = xenstore.h xenstore_lib.h
@@ -21,9 +20,6 @@ CFLAGS += -include $(XEN_ROOT)/tools/config.h
 CFLAGS += $(CFLAGS_libxentoolcore)
 CFLAGS += -DXEN_RUN_STORED="\"$(XEN_RUN_STORED)\""
 
-vpath xs_lib.c $(XEN_ROOT)/tools/xenstore
-CFLAGS += -iquote $(XEN_ROOT)/tools/xenstore
-
 xs.opic: CFLAGS += -DUSE_PTHREAD
 ifeq ($(CONFIG_Linux),y)
 xs.opic: CFLAGS += -DUSE_DLSYM
diff --git a/tools/libs/store/xs.c b/tools/libs/store/xs.c
index bb93246bfb..140b9a2839 100644
--- a/tools/libs/store/xs.c
+++ b/tools/libs/store/xs.c
@@ -34,8 +34,8 @@
 #include <stdint.h>
 #include <errno.h>
 #include <xen-tools/common-macros.h>
+#include <xen-tools/xenstore-common.h>
 #include "xenstore.h"
-#include "xs_lib.h"
 
 #include <xentoolcore_internal.h>
 #include <xen_list.h>
@@ -627,7 +627,7 @@ static char **xs_directory_common(char *strings, unsigned 
int len,
        char *p, **ret;
 
        /* Count the strings. */
-       *num = xs_count_strings(strings, len);
+       *num = xenstore_count_strings(strings, len);
 
        /* Transfer to one big alloc for easy freeing. */
        ret = malloc(*num * sizeof(char *) + len);
@@ -775,7 +775,7 @@ struct xs_permissions *xs_get_permissions(struct xs_handle 
*h,
                return NULL;
 
        /* Count the strings: each one perms then domid. */
-       *num = xs_count_strings(strings, len);
+       *num = xenstore_count_strings(strings, len);
 
        /* Transfer to one big alloc for easy freeing. */
        ret = malloc(*num * sizeof(struct xs_permissions));
@@ -784,7 +784,7 @@ struct xs_permissions *xs_get_permissions(struct xs_handle 
*h,
                return NULL;
        }
 
-       if (!xs_strings_to_perms(ret, *num, strings)) {
+       if (!xenstore_strings_to_perms(ret, *num, strings)) {
                free_no_errno(ret);
                ret = NULL;
        }
@@ -811,7 +811,7 @@ bool xs_set_permissions(struct xs_handle *h,
        for (i = 0; i < num_perms; i++) {
                char buffer[MAX_STRLEN(unsigned int)+1];
 
-               if (!xs_perm_to_string(&perms[i], buffer, sizeof(buffer)))
+               if (!xenstore_perm_to_string(&perms[i], buffer, sizeof(buffer)))
                        goto unwind;
 
                iov[i+1].iov_base = strdup(buffer);
@@ -977,7 +977,7 @@ static char **read_watch_internal(struct xs_handle *h, 
unsigned int *num,
        assert(msg->hdr.type == XS_WATCH_EVENT);
 
        strings     = msg->body;
-       num_strings = xs_count_strings(strings, msg->hdr.len);
+       num_strings = xenstore_count_strings(strings, msg->hdr.len);
 
        ret = malloc(sizeof(char*) * num_strings + msg->hdr.len);
        if (!ret) {
@@ -1366,11 +1366,27 @@ error:
        return ret;
 }
 
+const char *xs_daemon_socket(void)
+{
+       return xenstore_daemon_path();
+}
+
 const char *xs_daemon_socket_ro(void)
 {
        return xs_daemon_socket();
 }
 
+const char *xs_daemon_rundir(void)
+{
+       return xenstore_daemon_rundir();
+}
+
+bool xs_strings_to_perms(struct xs_permissions *perms, unsigned int num,
+                        const char *strings)
+{
+       return xenstore_strings_to_perms(perms, num, strings);
+}
+
 #ifdef USE_PTHREAD
 static void *read_thread(void *arg)
 {
diff --git a/tools/xenstore/COPYING b/tools/xenstore/COPYING
deleted file mode 100644
index c764b2e329..0000000000
--- a/tools/xenstore/COPYING
+++ /dev/null
@@ -1,514 +0,0 @@
-This license (LGPL) applies to the xenstore library which interfaces
-with the xenstore daemon (as stated in xs.c, xenstore.h, xs_lib.c and
-xenstore_lib.h).  The remaining files in the directory are licensed as
-stated in the comments (as of this writing, GPL, see ../../COPYING).
-
-
-                  GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 2.1, February 1999
-
- Copyright (C) 1991, 1999 Free Software Foundation, Inc.
-       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-[This is the first released version of the Lesser GPL.  It also counts
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-
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-specially designated software packages--typically libraries--of the
-Free Software Foundation and other authors who decide to use it.  You
-can use it too, but we suggest you first think carefully about whether
-this license or the ordinary General Public License is the better
-strategy to use in any particular case, based on the explanations
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-
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diff --git a/tools/xenstore/Makefile b/tools/xenstore/Makefile
index 56723139a1..dc39b6cb31 100644
--- a/tools/xenstore/Makefile
+++ b/tools/xenstore/Makefile
@@ -44,7 +44,7 @@ xenstored: $(XENSTORED_OBJS-y)
 $(CLIENTS): xenstore
        ln -f xenstore $@
 
-xenstore: xenstore_client.o xs_lib.o
+xenstore: xenstore_client.o
        $(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@ $(APPEND_LDFLAGS)
 
 xenstore-control: xenstore_control.o
diff --git a/tools/xenstore/Makefile.common b/tools/xenstore/Makefile.common
index b18f95c103..f71c9bfd55 100644
--- a/tools/xenstore/Makefile.common
+++ b/tools/xenstore/Makefile.common
@@ -2,7 +2,7 @@
 
 XENSTORED_OBJS-y := xenstored_core.o xenstored_watch.o xenstored_domain.o
 XENSTORED_OBJS-y += xenstored_transaction.o xenstored_control.o
-XENSTORED_OBJS-y += xs_lib.o talloc.o utils.o tdb.o hashtable.o
+XENSTORED_OBJS-y += talloc.o utils.o tdb.o hashtable.o
 
 XENSTORED_OBJS-$(CONFIG_Linux) += xenstored_posix.o
 XENSTORED_OBJS-$(CONFIG_NetBSD) += xenstored_posix.o
diff --git a/tools/xenstore/xenstore_client.c b/tools/xenstore/xenstore_client.c
index 27fda81401..a104cf6487 100644
--- a/tools/xenstore/xenstore_client.c
+++ b/tools/xenstore/xenstore_client.c
@@ -23,7 +23,7 @@
 
 #include <sys/ioctl.h>
 
-#include "xs_lib.h"
+#include <xen-tools/xenstore-common.h>
 
 #define PATH_SEP '/'
 #define MAX_PATH_LEN 256
@@ -361,7 +361,7 @@ static void do_ls(struct xs_handle *h, char *path, int 
cur_depth, int show_perms
                 for (i = 0; i < nperms; i++) {
                     if (i)
                         putchar(',');
-                    xs_perm_to_string(perms+i, buf, sizeof(buf));
+                    xenstore_perm_to_string(perms+i, buf, sizeof(buf));
                     fputs(buf, stdout);
                 }
                 putchar(')');
diff --git a/tools/xenstore/xenstored_control.c 
b/tools/xenstore/xenstored_control.c
index 6ef800ff64..0d131e2ebc 100644
--- a/tools/xenstore/xenstored_control.c
+++ b/tools/xenstore/xenstored_control.c
@@ -31,10 +31,10 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <xenctrl.h>
+#include <xen-tools/xenstore-common.h>
 
 #include "utils.h"
 #include "talloc.h"
-#include "xs_lib.h"
 #include "xenstored_core.h"
 #include "xenstored_control.h"
 #include "xenstored_domain.h"
@@ -560,7 +560,8 @@ static FILE *lu_dump_open(const void *ctx)
        char *filename;
        int fd;
 
-       filename = talloc_asprintf(ctx, "%s/state_dump", xs_daemon_rundir());
+       filename = talloc_asprintf(ctx, "%s/state_dump",
+                                  xenstore_daemon_rundir());
        if (!filename)
                return NULL;
 
@@ -583,7 +584,7 @@ static void lu_get_dump_state(struct lu_dump_state *state)
        state->size = 0;
 
        state->filename = talloc_asprintf(NULL, "%s/state_dump",
-                                         xs_daemon_rundir());
+                                         xenstore_daemon_rundir());
        if (!state->filename)
                barf("Allocation failure");
 
@@ -1017,7 +1018,7 @@ int do_control(const void *ctx, struct connection *conn,
        if (cmd == ARRAY_SIZE(cmds))
                return EINVAL;
 
-       num = xs_count_strings(in->buffer, in->used);
+       num = xenstore_count_strings(in->buffer, in->used);
        if (cmds[cmd].max_pars)
                num = min(num, cmds[cmd].max_pars);
        vec = talloc_array(ctx, char *, num);
diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index a78cbf1116..62deee9cb9 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -42,11 +42,11 @@
 #include <setjmp.h>
 
 #include <xenevtchn.h>
+#include <xen-tools/xenstore-common.h>
 
 #include "utils.h"
 #include "list.h"
 #include "talloc.h"
-#include "xs_lib.h"
 #include "xenstored_core.h"
 #include "xenstored_watch.h"
 #include "xenstored_transaction.h"
@@ -1201,7 +1201,8 @@ static char *perms_to_strings(const void *ctx, const 
struct node_perms *perms,
        char buffer[MAX_STRLEN(unsigned int) + 1];
 
        for (*len = 0, i = 0; i < perms->num; i++) {
-               if (!xs_perm_to_string(&perms->p[i], buffer, sizeof(buffer)))
+               if (!xenstore_perm_to_string(&perms->p[i], buffer,
+                                            sizeof(buffer)))
                        return NULL;
 
                strings = talloc_realloc(ctx, strings, char,
@@ -1279,7 +1280,7 @@ static int send_directory_part(const void *ctx, struct 
connection *conn,
        struct node *node;
        char gen[24];
 
-       if (xs_count_strings(in->buffer, in->used) != 2)
+       if (xenstore_count_strings(in->buffer, in->used) != 2)
                return EINVAL;
 
        /* First arg is node name. */
@@ -1766,7 +1767,7 @@ static int do_set_perms(const void *ctx, struct 
connection *conn,
        char *name, *permstr;
        struct node *node;
 
-       perms.num = xs_count_strings(in->buffer, in->used);
+       perms.num = xenstore_count_strings(in->buffer, in->used);
        if (perms.num < 2)
                return EINVAL;
 
@@ -1779,7 +1780,7 @@ static int do_set_perms(const void *ctx, struct 
connection *conn,
        perms.p = talloc_array(ctx, struct xs_permissions, perms.num);
        if (!perms.p)
                return ENOMEM;
-       if (!xs_strings_to_perms(perms.p, perms.num, permstr))
+       if (!xenstore_strings_to_perms(perms.p, perms.num, permstr))
                return errno;
 
        if (domain_alloc_permrefs(&perms) < 0)
@@ -2575,7 +2576,7 @@ static void destroy_fds(void)
 static void init_sockets(void)
 {
        struct sockaddr_un addr;
-       const char *soc_str = xs_daemon_socket();
+       const char *soc_str = xenstore_daemon_path();
 
        if (!soc_str)
                barf_perror("Failed to obtain xs domain socket");
@@ -2890,7 +2891,7 @@ int main(int argc, char *argv[])
 
        /* Make sure xenstored directory exists. */
        /* Errors ignored here, will be reported when we open files */
-       mkdir(xs_daemon_rundir(), 0755);
+       mkdir(xenstore_daemon_rundir(), 0755);
 
        if (dofork) {
                openlog("xenstored", 0, LOG_DAEMON);
diff --git a/tools/xenstore/xs_lib.c b/tools/xenstore/xs_lib.c
deleted file mode 100644
index 826fa7b5a8..0000000000
--- a/tools/xenstore/xs_lib.c
+++ /dev/null
@@ -1,126 +0,0 @@
-/* 
-    Common routines between Xen store user library and daemon.
-    Copyright (C) 2005 Rusty Russell IBM Corporation
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Lesser General Public
-    License as published by the Free Software Foundation; either
-    version 2.1 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Lesser General Public License for more details.
-
-    You should have received a copy of the GNU Lesser General Public
-    License along with this library; If not, see 
<http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include "xs_lib.h"
-
-/* Common routines for the Xen store daemon and client library. */
-
-const char *xs_daemon_rundir(void)
-{
-       char *s = getenv("XENSTORED_RUNDIR");
-       return (s ? s : XEN_RUN_STORED);
-}
-
-static const char *xs_daemon_path(void)
-{
-       static char buf[PATH_MAX];
-       char *s = getenv("XENSTORED_PATH");
-       if (s)
-               return s;
-       if (snprintf(buf, sizeof(buf), "%s/socket",
-                    xs_daemon_rundir()) >= PATH_MAX)
-               return NULL;
-       return buf;
-}
-
-const char *xs_daemon_socket(void)
-{
-       return xs_daemon_path();
-}
-
-/* Convert strings to permissions.  False if a problem. */
-bool xs_strings_to_perms(struct xs_permissions *perms, unsigned int num,
-                        const char *strings)
-{
-       const char *p;
-       char *end;
-       unsigned int i;
-
-       for (p = strings, i = 0; i < num; i++) {
-               /* "r", "w", or "b" for both. */
-               switch (*p) {
-               case 'r':
-                       perms[i].perms = XS_PERM_READ;
-                       break;
-               case 'w':
-                       perms[i].perms = XS_PERM_WRITE;
-                       break;
-               case 'b':
-                       perms[i].perms = XS_PERM_READ|XS_PERM_WRITE;
-                       break;
-               case 'n':
-                       perms[i].perms = XS_PERM_NONE;
-                       break;
-               default:
-                       errno = EINVAL;
-                       return false;
-               } 
-               p++;
-               perms[i].id = strtol(p, &end, 0);
-               if (*end || !*p) {
-                       errno = EINVAL;
-                       return false;
-               }
-               p = end + 1;
-       }
-       return true;
-}
-
-/* Convert permissions to a string (up to len MAX_STRLEN(unsigned int)+1). */
-bool xs_perm_to_string(const struct xs_permissions *perm,
-                       char *buffer, size_t buf_len)
-{
-       switch ((int)perm->perms & ~XS_PERM_IGNORE) {
-       case XS_PERM_WRITE:
-               *buffer = 'w';
-               break;
-       case XS_PERM_READ:
-               *buffer = 'r';
-               break;
-       case XS_PERM_READ|XS_PERM_WRITE:
-               *buffer = 'b';
-               break;
-       case XS_PERM_NONE:
-               *buffer = 'n';
-               break;
-       default:
-               errno = EINVAL;
-               return false;
-       }
-       snprintf(buffer+1, buf_len-1, "%i", (int)perm->id);
-       return true;
-}
-
-/* Given a string and a length, count how many strings (nul terms). */
-unsigned int xs_count_strings(const char *strings, unsigned int len)
-{
-       unsigned int num;
-       const char *p;
-
-       for (p = strings, num = 0; p < strings + len; p++)
-               if (*p == '\0')
-                       num++;
-
-       return num;
-}
diff --git a/tools/xenstore/xs_lib.h b/tools/xenstore/xs_lib.h
deleted file mode 100644
index 5b9874d741..0000000000
--- a/tools/xenstore/xs_lib.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
-    Common routines between Xen store user library and daemon.
-    Copyright (C) 2005 Rusty Russell IBM Corporation
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Lesser General Public
-    License as published by the Free Software Foundation; either
-    version 2.1 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Lesser General Public License for more details.
-
-    You should have received a copy of the GNU Lesser General Public
-    License along with this library; If not, see 
<http://www.gnu.org/licenses/>.
-*/
-
-#ifndef XS_LIB_H
-#define XS_LIB_H
-
-#include "xenstore_lib.h"
-
-/* Convert permissions to a string (up to len MAX_STRLEN(unsigned int)+1). */
-bool xs_perm_to_string(const struct xs_permissions *perm,
-                      char *buffer, size_t buf_len);
-
-/* Given a string and a length, count how many strings (nul terms). */
-unsigned int xs_count_strings(const char *strings, unsigned int len);
-
-#endif /* XS_LIB_H */
--
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