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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2012-2015 Magnus Edenhill
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/
/**
* POSIX system support
*/
#ifndef _RDPOSIX_H_
#define _RDPOSIX_H_
#include <unistd.h>
#include <stdio.h>
#include <sys/time.h>
#include <inttypes.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/**
* Types
*/
/**
* Annotations, attributes, optimizers
*/
#ifndef likely
#define likely(x) __builtin_expect((x), 1)
#endif
#ifndef unlikely
#define unlikely(x) __builtin_expect((x), 0)
#endif
#define RD_UNUSED __attribute__((unused))
#define RD_INLINE inline
#define RD_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#define RD_NORETURN __attribute__((noreturn))
#define RD_IS_CONSTANT(p) __builtin_constant_p((p))
#define RD_TLS __thread
/**
* Allocation
*/
#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
/* alloca(3) is in stdlib on FreeBSD */
#include <alloca.h>
#endif
#define rd_alloca(N) alloca(N)
/**
* Strings, formatting, printf, ..
*/
/* size_t and ssize_t format strings */
#define PRIusz "zu"
#define PRIdsz "zd"
#ifndef RD_FORMAT
#define RD_FORMAT(...) __attribute__((format(__VA_ARGS__)))
#endif
#define rd_snprintf(...) snprintf(__VA_ARGS__)
#define rd_vsnprintf(...) vsnprintf(__VA_ARGS__)
#define rd_strcasecmp(A, B) strcasecmp(A, B)
#define rd_strncasecmp(A, B, N) strncasecmp(A, B, N)
#ifdef HAVE_STRCASESTR
#define rd_strcasestr(HAYSTACK, NEEDLE) strcasestr(HAYSTACK, NEEDLE)
#else
#define rd_strcasestr(HAYSTACK, NEEDLE) _rd_strcasestr(HAYSTACK, NEEDLE)
#endif
/**
* Errors
*/
#define rd_set_errno(err) (errno = (err))
#if HAVE_STRERROR_R
static RD_INLINE RD_UNUSED const char *rd_strerror(int err) {
static RD_TLS char ret[128];
#if defined(__GLIBC__) && defined(_GNU_SOURCE)
return strerror_r(err, ret, sizeof(ret));
#else /* XSI version */
int r;
/* The r assignment is to catch the case where
* _GNU_SOURCE is not defined but the GNU version is
* picked up anyway. */
r = strerror_r(err, ret, sizeof(ret));
if (unlikely(r))
rd_snprintf(ret, sizeof(ret), "strerror_r(%d) failed (ret %d)",
err, r);
return ret;
#endif
}
#else
#define rd_strerror(err) strerror(err)
#endif
/**
* Atomics
*/
#include "rdatomic.h"
/**
* Misc
*/
/**
* Microsecond sleep.
* Will retry on signal interrupt unless *terminate is true.
*/
static RD_INLINE RD_UNUSED void rd_usleep(int usec, rd_atomic32_t *terminate) {
struct timespec req = {usec / 1000000, (long)(usec % 1000000) * 1000};
/* Retry until complete (issue #272), unless terminating. */
while (nanosleep(&req, &req) == -1 &&
(errno == EINTR && (!terminate || !rd_atomic32_get(terminate))))
;
}
#define rd_gettimeofday(tv, tz) gettimeofday(tv, tz)
#ifndef __COVERITY__
#define rd_assert(EXPR) assert(EXPR)
#else
extern void __coverity_panic__(void);
#define rd_assert(EXPR) \
do { \
if (!(EXPR)) \
__coverity_panic__(); \
} while (0)
#endif
static RD_INLINE RD_UNUSED const char *rd_getenv(const char *env,
const char *def) {
const char *tmp;
tmp = getenv(env);
if (tmp && *tmp)
return tmp;
return def;
}
/**
* Empty struct initializer
*/
#define RD_ZERO_INIT \
{}
/**
* Sockets, IO
*/
/** @brief Socket type */
typedef int rd_socket_t;
/** @brief Socket API error return value */
#define RD_SOCKET_ERROR (-1)
/** @brief Last socket error */
#define rd_socket_errno errno
/** @brief String representation of socket error */
#define rd_socket_strerror(ERR) rd_strerror(ERR)
/** @brief poll() struct type */
typedef struct pollfd rd_pollfd_t;
/** @brief poll(2) */
#define rd_socket_poll(POLLFD, FDCNT, TIMEOUT_MS) \
poll(POLLFD, FDCNT, TIMEOUT_MS)
/**
* @brief Set socket to non-blocking
* @returns 0 on success or errno on failure.
*/
static RD_UNUSED int rd_fd_set_nonblocking(int fd) {
int fl = fcntl(fd, F_GETFL, 0);
if (fl == -1 || fcntl(fd, F_SETFL, fl | O_NONBLOCK) == -1)
return errno;
return 0;
}
/**
* @brief Create non-blocking pipe
* @returns 0 on success or errno on failure
*/
static RD_UNUSED int rd_pipe_nonblocking(rd_socket_t *fds) {
if (pipe(fds) == -1 || rd_fd_set_nonblocking(fds[0]) == -1 ||
rd_fd_set_nonblocking(fds[1]))
return errno;
/* Minimize buffer sizes to avoid a large number
* of signaling bytes to accumulate when
* io-signalled queue is not being served for a while. */
#ifdef F_SETPIPE_SZ
/* Linux automatically rounds the pipe size up
* to the minimum size. */
fcntl(fds[0], F_SETPIPE_SZ, 100);
fcntl(fds[1], F_SETPIPE_SZ, 100);
#endif
return 0;
}
#define rd_socket_read(fd, buf, sz) read(fd, buf, sz)
#define rd_socket_write(fd, buf, sz) write(fd, buf, sz)
#define rd_socket_close(fd) close(fd)
/* File IO */
#define rd_write(fd, buf, sz) write(fd, buf, sz)
#define rd_open(path, flags, mode) open(path, flags, mode)
#define rd_close(fd) close(fd)
#endif /* _RDPOSIX_H_ */
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