mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-16 11:22:12 +00:00
425 lines
9.8 KiB
C
425 lines
9.8 KiB
C
/** Allows to build programs with libc 2.27 and run on systems with at least libc 2.4,
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* such as Ubuntu Hardy or CentOS 5.
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*
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* Also look at http://www.lightofdawn.org/wiki/wiki.cgi/NewAppsOnOldGlibc
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*/
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#if defined (__cplusplus)
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extern "C" {
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#endif
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/syscall.h>
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long int syscall(long int __sysno, ...) __THROW;
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int __gai_sigqueue(int sig, const union sigval val, pid_t caller_pid)
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{
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siginfo_t info;
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memset(&info, 0, sizeof(siginfo_t));
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info.si_signo = sig;
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info.si_code = SI_ASYNCNL;
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info.si_pid = caller_pid;
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info.si_uid = getuid();
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info.si_value = val;
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return syscall(__NR_rt_sigqueueinfo, info.si_pid, sig, &info);
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}
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#include <sys/select.h>
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#include <stdlib.h>
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#include <features.h>
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#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16)
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long int __fdelt_chk(long int d)
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{
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if (d < 0)
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abort();
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#else
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unsigned long int __fdelt_chk(unsigned long int d)
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{
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#endif
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if (d >= FD_SETSIZE)
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abort();
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return d / __NFDBITS;
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}
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#include <sys/poll.h>
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#include <stddef.h>
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int __poll_chk(struct pollfd * fds, nfds_t nfds, int timeout, size_t fdslen)
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{
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if (fdslen / sizeof(*fds) < nfds)
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abort();
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return poll(fds, nfds, timeout);
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}
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#include <setjmp.h>
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void musl_glibc_longjmp(jmp_buf env, int val);
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/// NOTE This disables some of FORTIFY_SOURCE functionality.
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void __longjmp_chk(jmp_buf env, int val)
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{
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musl_glibc_longjmp(env, val);
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}
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#include <stdarg.h>
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int vasprintf(char **s, const char *fmt, va_list ap);
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int __vasprintf_chk(char **s, int unused, const char *fmt, va_list ap)
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{
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return vasprintf(s, fmt, ap);
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}
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int __asprintf_chk(char **result_ptr, int unused, const char *format, ...)
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{
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int ret;
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va_list ap;
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va_start (ap, format);
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ret = vasprintf(result_ptr, format, ap);
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va_end (ap);
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return ret;
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}
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int vdprintf(int fd, const char *format, va_list ap);
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int __dprintf_chk (int d, int unused, const char *format, ...)
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{
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int ret;
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va_list ap;
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va_start (ap, format);
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ret = vdprintf(d, format, ap);
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va_end (ap);
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return ret;
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}
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size_t fread(void *ptr, size_t size, size_t nmemb, void *stream);
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size_t __fread_chk(void *ptr, size_t unused, size_t size, size_t nmemb, void *stream)
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{
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return fread(ptr, size, nmemb, stream);
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}
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int vsscanf(const char *str, const char *format, va_list ap);
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int __isoc99_vsscanf(const char *str, const char *format, va_list ap)
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{
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return vsscanf(str, format, ap);
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}
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int sscanf(const char *restrict s, const char *restrict fmt, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, fmt);
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ret = vsscanf(s, fmt, ap);
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va_end(ap);
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return ret;
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}
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int __isoc99_sscanf(const char *str, const char *format, ...) __attribute__((weak, nonnull, nothrow, alias("sscanf")));
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int open(const char *path, int oflag);
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int __open_2(const char *path, int oflag)
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{
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return open(path, oflag);
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}
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#include <pthread.h>
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/// No-ops.
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int pthread_setname_np(pthread_t thread, const char *name) { return 0; }
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int pthread_getname_np(pthread_t thread, char *name, size_t len) { name[0] = '\0'; return 0; };
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#define SHMDIR "/dev/shm/"
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const char * __shm_directory(size_t * len)
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{
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*len = sizeof(SHMDIR) - 1;
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return SHMDIR;
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}
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/// https://boringssl.googlesource.com/boringssl/+/ad1907fe73334d6c696c8539646c21b11178f20f%5E!/#F0
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/* Copyright (c) 2015, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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void __attribute__((__weak__)) explicit_bzero(void * buf, size_t len)
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{
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memset(buf, 0, len);
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__asm__ __volatile__("" :: "r"(buf) : "memory");
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}
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void __explicit_bzero_chk(void * buf, size_t len, size_t unused)
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{
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return explicit_bzero(buf, len);
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}
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#include <unistd.h>
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#include "syscall.h"
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ssize_t copy_file_range(int fd_in, off_t *off_in, int fd_out, off_t *off_out, size_t len, unsigned flags)
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{
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return syscall(SYS_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
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}
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long splice(int fd_in, off_t *off_in, int fd_out, off_t *off_out, size_t len, unsigned flags)
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{
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return syscall(SYS_splice, fd_in, off_in, fd_out, off_out, len, flags);
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}
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#define _BSD_SOURCE
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#include <sys/stat.h>
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#include <stdint.h>
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#if !defined(__aarch64__)
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struct statx {
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uint32_t stx_mask;
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uint32_t stx_blksize;
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uint64_t stx_attributes;
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uint32_t stx_nlink;
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uint32_t stx_uid;
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uint32_t stx_gid;
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uint16_t stx_mode;
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uint16_t pad1;
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uint64_t stx_ino;
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uint64_t stx_size;
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uint64_t stx_blocks;
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uint64_t stx_attributes_mask;
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struct {
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int64_t tv_sec;
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uint32_t tv_nsec;
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int32_t pad;
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} stx_atime, stx_btime, stx_ctime, stx_mtime;
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uint32_t stx_rdev_major;
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uint32_t stx_rdev_minor;
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uint32_t stx_dev_major;
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uint32_t stx_dev_minor;
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uint64_t spare[14];
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};
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#endif
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int statx(int fd, const char *restrict path, int flag,
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unsigned int mask, struct statx *restrict statxbuf)
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{
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return syscall(SYS_statx, fd, path, flag, mask, statxbuf);
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}
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#include <syscall.h>
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ssize_t getrandom(void *buf, size_t buflen, unsigned flags)
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{
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/// There was cancellable syscall (syscall_cp), but I don't care too.
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return syscall(SYS_getrandom, buf, buflen, flags);
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}
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#include <errno.h>
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#include <limits.h>
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#define ALIGN (sizeof(size_t))
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#define ONES ((size_t)-1/UCHAR_MAX)
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#define HIGHS (ONES * (UCHAR_MAX/2+1))
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#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
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char *__strchrnul(const char *s, int c)
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{
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c = (unsigned char)c;
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if (!c) return (char *)s + strlen(s);
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#ifdef __GNUC__
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typedef size_t __attribute__((__may_alias__)) word;
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const word *w;
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for (; (uintptr_t)s % ALIGN; s++)
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if (!*s || *(unsigned char *)s == c) return (char *)s;
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size_t k = ONES * c;
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for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++);
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s = (void *)w;
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#endif
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for (; *s && *(unsigned char *)s != c; s++);
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return (char *)s;
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}
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int __execvpe(const char *file, char *const argv[], char *const envp[])
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{
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const char *p, *z, *path = getenv("PATH");
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size_t l, k;
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int seen_eacces = 0;
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errno = ENOENT;
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if (!*file) return -1;
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if (strchr(file, '/'))
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return execve(file, argv, envp);
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if (!path) path = "/usr/local/bin:/bin:/usr/bin";
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k = strnlen(file, NAME_MAX+1);
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if (k > NAME_MAX) {
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errno = ENAMETOOLONG;
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return -1;
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}
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l = strnlen(path, PATH_MAX-1)+1;
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for(p=path; ; p=z) {
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char b[l+k+1];
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z = __strchrnul(p, ':');
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if (z-p >= l) {
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if (!*z++) break;
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continue;
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}
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memcpy(b, p, z-p);
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b[z-p] = '/';
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memcpy(b+(z-p)+(z>p), file, k+1);
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execve(b, argv, envp);
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switch (errno) {
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case EACCES:
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seen_eacces = 1;
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case ENOENT:
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case ENOTDIR:
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break;
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default:
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return -1;
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}
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if (!*z++) break;
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}
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if (seen_eacces) errno = EACCES;
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return -1;
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}
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#include "spawn.h"
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int posix_spawnp(pid_t *restrict res, const char *restrict file,
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const posix_spawn_file_actions_t *fa,
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const posix_spawnattr_t *restrict attr,
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char *const argv[restrict], char *const envp[restrict])
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{
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posix_spawnattr_t spawnp_attr = { 0 };
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if (attr) spawnp_attr = *attr;
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spawnp_attr.__fn = (void *)__execvpe;
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return posix_spawn(res, file, fa, &spawnp_attr, argv, envp);
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}
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#define FDOP_CLOSE 1
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#define FDOP_DUP2 2
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#define FDOP_OPEN 3
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#define FDOP_CHDIR 4
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#define FDOP_FCHDIR 5
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#define ENOMEM 12
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#define EBADF 9
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struct fdop {
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struct fdop *next, *prev;
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int cmd, fd, srcfd, oflag;
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mode_t mode;
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char path[];
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};
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int posix_spawn_file_actions_init(posix_spawn_file_actions_t *fa) {
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fa->__actions = 0;
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return 0;
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}
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int posix_spawn_file_actions_addchdir_np(posix_spawn_file_actions_t *restrict fa, const char *restrict path) {
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struct fdop *op = malloc(sizeof *op + strlen(path) + 1);
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if (!op) return ENOMEM;
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op->cmd = FDOP_CHDIR;
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op->fd = -1;
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strcpy(op->path, path);
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if ((op->next = fa->__actions)) op->next->prev = op;
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op->prev = 0;
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fa->__actions = op;
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return 0;
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}
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int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa, int fd) {
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if (fd < 0) return EBADF;
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struct fdop *op = malloc(sizeof *op);
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if (!op) return ENOMEM;
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op->cmd = FDOP_CLOSE;
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op->fd = fd;
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if ((op->next = fa->__actions)) op->next->prev = op;
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op->prev = 0;
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fa->__actions = op;
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return 0;
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}
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int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa, int srcfd, int fd) {
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if (srcfd < 0 || fd < 0) return EBADF;
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struct fdop *op = malloc(sizeof *op);
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if (!op) return ENOMEM;
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op->cmd = FDOP_DUP2;
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op->srcfd = srcfd;
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op->fd = fd;
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if ((op->next = fa->__actions)) op->next->prev = op;
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op->prev = 0;
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fa->__actions = op;
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return 0;
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}
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int posix_spawn_file_actions_addfchdir_np(posix_spawn_file_actions_t *fa, int fd) {
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if (fd < 0) return EBADF;
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struct fdop *op = malloc(sizeof *op);
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if (!op) return ENOMEM;
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op->cmd = FDOP_FCHDIR;
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op->fd = fd;
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if ((op->next = fa->__actions)) op->next->prev = op;
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op->prev = 0;
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fa->__actions = op;
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return 0;
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}
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int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *restrict fa, int fd, const char *restrict path, int flags, mode_t mode) {
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if (fd < 0) return EBADF;
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struct fdop *op = malloc(sizeof *op + strlen(path) + 1);
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if (!op) return ENOMEM;
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op->cmd = FDOP_OPEN;
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op->fd = fd;
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op->oflag = flags;
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op->mode = mode;
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strcpy(op->path, path);
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if ((op->next = fa->__actions)) op->next->prev = op;
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op->prev = 0;
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fa->__actions = op;
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return 0;
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}
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int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *fa) {
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struct fdop *op = fa->__actions, *next;
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while (op) {
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next = op->next;
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free(op);
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op = next;
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}
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return 0;
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}
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#if defined (__cplusplus)
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}
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#endif
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