ClickHouse/libs/libglibc-compatibility/glibc-compatibility.c

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/** Allows to build programs with libc 2.18 and run on systems with at least libc 2.4,
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* such as Ubuntu Lucid or CentOS 6.
*
* Also look at http://www.lightofdawn.org/wiki/wiki.cgi/NewAppsOnOldGlibc
*/
#if defined (__cplusplus)
extern "C" {
#endif
#include <pthread.h>
size_t __pthread_get_minstack(const pthread_attr_t * attr)
{
return 1048576; /// This is a guess. Don't sure it is correct.
}
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <sys/syscall.h>
long int syscall(long int __sysno, ...) __THROW;
int __gai_sigqueue(int sig, const union sigval val, pid_t caller_pid)
{
siginfo_t info;
memset(&info, 0, sizeof(siginfo_t));
info.si_signo = sig;
info.si_code = SI_ASYNCNL;
info.si_pid = caller_pid;
info.si_uid = getuid();
info.si_value = val;
return syscall(__NR_rt_sigqueueinfo, info.si_pid, sig, &info);
}
#include <sys/select.h>
#include <stdlib.h>
#include <features.h>
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16)
long int __fdelt_chk(long int d)
{
if (d < 0)
abort();
#else
unsigned long int __fdelt_chk(unsigned long int d)
{
#endif
if (d >= FD_SETSIZE)
abort();
return d / __NFDBITS;
}
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#include <sys/poll.h>
#include <stddef.h>
int __poll_chk(struct pollfd * fds, nfds_t nfds, int timeout, size_t fdslen)
{
if (fdslen / sizeof(*fds) < nfds)
abort();
return poll(fds, nfds, timeout);
}
#include <setjmp.h>
void musl_glibc_longjmp(jmp_buf env, int val);
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/// NOTE This disables some of FORTIFY_SOURCE functionality.
void __longjmp_chk(jmp_buf env, int val)
{
musl_glibc_longjmp(env, val);
}
#include <stdarg.h>
int vasprintf(char **s, const char *fmt, va_list ap);
int __vasprintf_chk(char **s, int unused, const char *fmt, va_list ap)
{
return vasprintf(s, fmt, ap);
}
size_t fread(void *ptr, size_t size, size_t nmemb, void *stream);
size_t __fread_chk(void *ptr, size_t unused, size_t size, size_t nmemb, void *stream)
{
return fread(ptr, size, nmemb, stream);
}
int vsscanf(const char *str, const char *format, va_list ap);
int __isoc99_vsscanf(const char *str, const char *format, va_list ap)
{
return vsscanf(str, format, ap);
}
int sscanf(const char *restrict s, const char *restrict fmt, ...)
{
int ret;
va_list ap;
va_start(ap, fmt);
ret = vsscanf(s, fmt, ap);
va_end(ap);
return ret;
}
int __isoc99_sscanf(const char *str, const char *format, ...) __attribute__((weak, alias("sscanf")));
int open(const char *path, int oflag);
int __open_2(const char *path, int oflag)
{
return open(path, oflag);
}
/// No-ops.
int pthread_setname_np(pthread_t thread, const char *name) { return 0; }
int pthread_getname_np(pthread_t thread, char *name, size_t len) { name[0] = '\0'; return 0; };
#define SHMDIR "/dev/shm/"
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const char * __shm_directory(size_t * len)
{
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*len = sizeof(SHMDIR) - 1;
return SHMDIR;
}
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/// https://boringssl.googlesource.com/boringssl/+/ad1907fe73334d6c696c8539646c21b11178f20f%5E!/#F0
/* Copyright (c) 2015, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
void explicit_bzero(void * buf, size_t len)
{
memset(buf, 0, len);
__asm__ __volatile__("" :: "r"(buf) : "memory");
}
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void __explicit_bzero_chk(void * buf, size_t len, size_t unused)
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{
return explicit_bzero(buf, len);
}
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#if defined (__cplusplus)
}
#endif