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https://github.com/libguestfs/libguestfs.git
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168 lines
6.5 KiB
C
168 lines
6.5 KiB
C
/* libguestfs
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* Copyright (C) 2013-2025 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* This header contains definitions which are shared by all parts of
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* libguestfs, ie. the daemon, the library, language bindings and virt
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* tools (ie. I<all> C code).
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*
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* If you need a definition used by only the library, put it in
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* F<lib/guestfs-internal.h> instead.
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*
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* If a definition is used by only a single tool, it should not be in
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* any shared header file at all.
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*/
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#ifndef GUESTFS_INTERNAL_ALL_H_
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#define GUESTFS_INTERNAL_ALL_H_
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#include <string.h>
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/* This is also defined in <guestfs.h>, so don't redefine it. */
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#if defined(__GNUC__) && !defined(GUESTFS_GCC_VERSION)
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# define GUESTFS_GCC_VERSION \
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(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
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#endif
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#if !defined(__attribute__) && defined(__GNUC__) && GUESTFS_GCC_VERSION < 20800 /* gcc < 2.8 */
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# define __attribute__(x) /* empty */
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#endif
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#ifndef ATTRIBUTE_UNUSED
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# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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#endif
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#define STREQ(a,b) (strcmp((a),(b)) == 0)
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#define STRCASEEQ(a,b) (strcasecmp((a),(b)) == 0)
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#define STRNEQ(a,b) (strcmp((a),(b)) != 0)
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#define STRCASENEQ(a,b) (strcasecmp((a),(b)) != 0)
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#define STREQLEN(a,b,n) (strncmp((a),(b),(n)) == 0)
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#define STRCASEEQLEN(a,b,n) (strncasecmp((a),(b),(n)) == 0)
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#define STRNEQLEN(a,b,n) (strncmp((a),(b),(n)) != 0)
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#define STRCASENEQLEN(a,b,n) (strncasecmp((a),(b),(n)) != 0)
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#define STRPREFIX(a,b) (strncmp((a),(b),strlen((b))) == 0)
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#define STRCASEPREFIX(a,b) (strncasecmp((a),(b),strlen((b))) == 0)
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#define STRSUFFIX(a,b) (strlen((a)) >= strlen((b)) && STREQ((a)+strlen((a))-strlen((b)),(b)))
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/* A simple (indeed, simplistic) way to build up short lists of
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* arguments. Your code must define MAX_ARGS to a suitable "larger
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* than could ever be needed" value. (If the value is exceeded then
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* your code will abort). For more complex needs, use something else
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* more suitable.
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*/
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#define ADD_ARG(argv,i,v) \
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do { \
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if ((i) >= MAX_ARGS) { \
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fprintf (stderr, "%s: %d: internal error: exceeded MAX_ARGS (%zu) when constructing the command line\n", __FILE__, __LINE__, (size_t) MAX_ARGS); \
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abort (); \
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} \
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(argv)[(i)++] = (v); \
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} while (0)
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#ifndef SOCK_CLOEXEC
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#define SOCK_CLOEXEC 0
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#endif
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#ifndef MAX
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#define MAX(a,b) ((a)>(b)?(a):(b))
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#endif
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#ifndef MIN
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#define MIN(a,b) ((a)<(b)?(a):(b))
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#endif
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#ifdef __APPLE__
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#define xdr_uint32_t xdr_u_int32_t
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#endif
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/* Return true iff the buffer is all zero bytes.
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*
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* The clever approach here was suggested by Eric Blake. See:
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* https://www.redhat.com/archives/libguestfs/2017-April/msg00171.html
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*/
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static inline int
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is_zero (const char *buffer, size_t size)
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{
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size_t i;
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const size_t limit = MIN (size, 16);
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for (i = 0; i < limit; ++i)
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if (buffer[i])
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return 0;
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if (size != limit)
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return !memcmp (buffer, buffer + 16, size - 16);
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return 1;
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}
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/* Macro which compiles the regexp once when the program/library is
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* loaded, and frees it when the library is unloaded.
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*/
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#define COMPILE_REGEXP(name,pattern,options) \
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static void compile_regexp_##name (void) __attribute__((constructor)); \
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static void free_regexp_##name (void) __attribute__((destructor)); \
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static pcre2_code *name; \
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\
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static void \
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compile_regexp_##name (void) \
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{ \
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int errnum; \
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PCRE2_SIZE offset; \
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name = pcre2_compile ((PCRE2_SPTR)(pattern), \
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PCRE2_ZERO_TERMINATED, \
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(options), &errnum, &offset, NULL); \
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if (name == NULL) { \
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PCRE2_UCHAR err[256]; \
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pcre2_get_error_message (errnum, err, sizeof err); \
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ignore_value (write (2, err, strlen ((char *)err))); \
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abort (); \
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} \
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} \
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\
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static void \
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free_regexp_##name (void) \
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{ \
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pcre2_code_free (name); \
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}
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/* The type field of a parsed mountable.
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*
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* This is used both by mountable_t in the daemon, and
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* struct guestfs_int_mountable_internal in the library.
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*/
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typedef enum {
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MOUNTABLE_DEVICE, /* A bare device */
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MOUNTABLE_BTRFSVOL, /* A btrfs subvolume: device + volume */
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MOUNTABLE_PATH /* An already mounted path: device = path */
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} mountable_type_t;
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/* Some functions replaced by gnulib */
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#ifndef HAVE_ACCEPT4
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#include <sys/socket.h>
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extern int accept4 (int sockfd, struct sockaddr *__restrict__ addr,
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socklen_t *__restrict__ addrlen, int flags);
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#endif
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#ifndef HAVE_PIPE2
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extern int pipe2 (int pipefd[2], int flags);
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#endif
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#endif /* GUESTFS_INTERNAL_ALL_H_ */
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