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The library is detected runtime. Signed-off-by: Tzvetomir Stoyanov (VMware) --- lib/trace-cmd/Makefile | 10 ++ lib/trace-cmd/include/trace-cmd-local.h | 5 + lib/trace-cmd/trace-compress-zlib.c | 172 ++++++++++++++++++++++++ lib/trace-cmd/trace-compress.c | 8 ++ 4 files changed, 195 insertions(+) create mode 100644 lib/trace-cmd/trace-compress-zlib.c diff --git a/lib/trace-cmd/Makefile b/lib/trace-cmd/Makefile index bab4322d..83ba7016 100644 --- a/lib/trace-cmd/Makefile +++ b/lib/trace-cmd/Makefile @@ -7,6 +7,13 @@ ldir:=$(src)/lib/trace-cmd DEFAULT_TARGET = $(LIBTRACECMD_STATIC) +pound := \# +ZLIB_INSTALLED := $(shell if (printf "$(pound)include \n void main(){deflateInit(NULL, Z_BEST_COMPRESSION);}" | $(CC) -o /dev/null -x c - -lz >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) +ifeq ($(ZLIB_INSTALLED), 1) +CFLAGS += -DHAVE_ZLIB +$(info Have zlib compression support) +endif + OBJS = OBJS += trace-hash.o OBJS += trace-hooks.o @@ -26,6 +33,9 @@ OBJS += trace-timesync-ptp.o OBJS += trace-timesync-kvm.o endif OBJS += trace-compress.o +ifeq ($(ZLIB_INSTALLED), 1) +OBJS += trace-compress-zlib.o +endif # Additional util objects OBJS += trace-blk-hack.o diff --git a/lib/trace-cmd/include/trace-cmd-local.h b/lib/trace-cmd/include/trace-cmd-local.h index c8c51ff0..86d91caf 100644 --- a/lib/trace-cmd/include/trace-cmd-local.h +++ b/lib/trace-cmd/include/trace-cmd-local.h @@ -30,6 +30,11 @@ void tracecmd_fatal(const char *fmt, ...); #endif #endif +#ifdef HAVE_ZLIB +int tracecmd_zlib_init(void); +void tracecmd_zlib_free(void); +#endif + int tracecmd_compress_init(void); void tracecmd_compress_free(void); diff --git a/lib/trace-cmd/trace-compress-zlib.c b/lib/trace-cmd/trace-compress-zlib.c new file mode 100644 index 00000000..3208d57b --- /dev/null +++ b/lib/trace-cmd/trace-compress-zlib.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * Copyright (C) 2021, VMware, Tzvetomir Stoyanov tz.stoyanov@gmail.com> + * + */ +#include +#include +#include +#include + +#include "trace-cmd-private.h" + +#define __ZLIB_NAME "zlib" +#define __ZLIB_WEIGTH 10 +#define __ZLIB_FILE "libz.so" +#define ZLIB_FUNC_COMPRESS "compress2" +#define ZLIB_FUNC_DECOMOPRESS "uncompress" +#define ZLIB_FUNC_SIZE "compressBound" +#define ZLIB_FUNC_VERSION "zlibVersion" + +static void *zlib_handle; +static int (*_lib_compress)(unsigned char *out, unsigned long *out_bytes, + unsigned char *in, unsigned long in_bytes, int level); +static int (*_libz_decompress)(unsigned char *out, unsigned long *out_bytes, + unsigned char *in, unsigned long in_bytes); +static unsigned long (*_libz_compress_bound)(unsigned long in_bytes); +static const char *(*_libz_version)(void); + +static int zlib_compress(char *in, unsigned int in_bytes, + char *out, unsigned int *out_bytes) +{ + unsigned long out_size = *out_bytes; + int ret; + + if (!_lib_compress) + return -1; + + ret = _lib_compress((unsigned char *)out, &out_size, + (unsigned char *)in, (unsigned long)in_bytes, Z_BEST_COMPRESSION); + *out_bytes = out_size; + errno = 0; + switch (ret) { + case Z_OK: + return 0; + case Z_BUF_ERROR: + errno = -ENOBUFS; + break; + case Z_MEM_ERROR: + errno = -ENOMEM; + break; + case Z_STREAM_ERROR: + errno = -EINVAL; + break; + default: + errno = -EFAULT; + break; + } + + return -1; +} + +static int zlib_decompress(char *in, unsigned int in_bytes, + char *out, unsigned int *out_bytes) +{ + unsigned long out_size = *out_bytes; + int ret; + + if (!_libz_decompress) + return -1; + + ret = _libz_decompress((unsigned char *)out, &out_size, + (unsigned char *)in, (unsigned long)in_bytes); + *out_bytes = out_size; + errno = 0; + switch (ret) { + case Z_OK: + return 0; + case Z_BUF_ERROR: + errno = -ENOBUFS; + break; + case Z_MEM_ERROR: + errno = -ENOMEM; + break; + case Z_DATA_ERROR: + errno = -EINVAL; + break; + default: + errno = -EFAULT; + break; + } + + return -1; +} + +static unsigned int zlib_compress_bound(unsigned int in_bytes) +{ + if (!_libz_compress_bound) + return 0; + return _libz_compress_bound(in_bytes); +} + +static bool zlib_is_supported(const char *name, const char *version) +{ + const char *zver; + + if (!name) + return false; + if (strlen(name) != strlen(__ZLIB_NAME) || strcmp(name, __ZLIB_NAME)) + return false; + + if (!version) + return true; + + if (!_libz_version) + return false; + zver = _libz_version(); + if (!zver) + return false; + + /* Compare the major version number */ + if (atoi(version) <= atoi(zver)) + return true; + + return false; +} + +int tracecmd_zlib_init(void) +{ + if (zlib_handle) + return 0; + + zlib_handle = dlopen(__ZLIB_FILE, RTLD_NOW | RTLD_GLOBAL); + if (!zlib_handle) + return -1; + _lib_compress = dlsym(zlib_handle, ZLIB_FUNC_COMPRESS); + if (!_lib_compress) + goto error; + _libz_decompress = dlsym(zlib_handle, ZLIB_FUNC_DECOMOPRESS); + if (!_libz_decompress) + goto error; + _libz_compress_bound = dlsym(zlib_handle, ZLIB_FUNC_SIZE); + if (!_libz_compress_bound) + goto error; + _libz_version = dlsym(zlib_handle, ZLIB_FUNC_VERSION); + if (!_libz_version) + goto error; + + return tracecmd_compress_proto_register(__ZLIB_NAME, _libz_version(), __ZLIB_WEIGTH, + zlib_compress, zlib_decompress, + zlib_compress_bound, zlib_is_supported); + +error: + _lib_compress = NULL; + _libz_decompress = NULL; + _libz_version = NULL; + dlclose(zlib_handle); + zlib_handle = NULL; + return -1; +} + +void tracecmd_zlib_free(void) +{ + _lib_compress = NULL; + _libz_decompress = NULL; + _libz_version = NULL; + + if (zlib_handle) { + dlclose(zlib_handle); + zlib_handle = NULL; + } + +} diff --git a/lib/trace-cmd/trace-compress.c b/lib/trace-cmd/trace-compress.c index 0f7e318a..dfa808ab 100644 --- a/lib/trace-cmd/trace-compress.c +++ b/lib/trace-cmd/trace-compress.c @@ -314,6 +314,10 @@ int tracecmd_compress_init(void) gettimeofday(&time, NULL); srand((time.tv_sec * 1000) + (time.tv_usec / 1000)); +#ifdef HAVE_ZLIB + tracecmd_zlib_init(); +#endif + return 0; } @@ -477,6 +481,10 @@ void tracecmd_compress_free(void) struct compress_proto *proto = proto_list; struct compress_proto *del; +#ifdef HAVE_ZLIB + tracecmd_zlib_free(); +#endif + while (proto) { del = proto; proto = proto->next; -- 2.31.1