mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
13ee75150c
This change turns symbol table compression back on using Puff, which noticeably reduces the size of programs like redbean and Python. The redbean web server receives some minor API additions for controlling things like SSL in addition to filling gaps in the documentation.
126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/bits.h"
|
|
#include "libc/bits/likely.h"
|
|
#include "libc/bits/weaken.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/state.internal.h"
|
|
#include "libc/calls/strace.internal.h"
|
|
#include "libc/calls/struct/iovec.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/describeflags.internal.h"
|
|
#include "libc/intrin/kprintf.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/sysv/consts/iov.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
#include "libc/zipos/zipos.internal.h"
|
|
|
|
static ssize_t Preadv(int fd, struct iovec *iov, int iovlen, int64_t off) {
|
|
static bool once, demodernize;
|
|
int i, err;
|
|
ssize_t rc;
|
|
size_t got, toto;
|
|
|
|
if (fd < 0) return einval();
|
|
if (iovlen < 0) return einval();
|
|
if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) return efault();
|
|
if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
|
|
return weaken(__zipos_read)(
|
|
(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, off);
|
|
} else if (IsWindows()) {
|
|
if (fd < g_fds.n) {
|
|
return sys_read_nt(g_fds.p + fd, iov, iovlen, off);
|
|
} else {
|
|
return ebadf();
|
|
}
|
|
} else if (IsMetal()) {
|
|
return enosys();
|
|
}
|
|
|
|
if (iovlen == 1) {
|
|
return sys_pread(fd, iov[0].iov_base, iov[0].iov_len, off, off);
|
|
}
|
|
|
|
/*
|
|
* NT, 2018-era XNU, and 2007-era Linux don't support this system call
|
|
*/
|
|
if (!__vforked && !once) {
|
|
err = errno;
|
|
rc = sys_preadv(fd, iov, iovlen, off, off);
|
|
if (rc == -1 && errno == ENOSYS) {
|
|
errno = err;
|
|
once = true;
|
|
demodernize = true;
|
|
STRACE("demodernizing %s() due to %s", "preadv", "ENOSYS");
|
|
} else {
|
|
once = true;
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
if (!demodernize) {
|
|
return sys_preadv(fd, iov, iovlen, off, off);
|
|
}
|
|
|
|
if (!iovlen) {
|
|
return sys_pread(fd, NULL, 0, off, off);
|
|
}
|
|
|
|
for (toto = i = 0; i < iovlen; ++i) {
|
|
rc = sys_pread(fd, iov[i].iov_base, iov[i].iov_len, off, off);
|
|
if (rc == -1) {
|
|
if (toto && (errno == EINTR || errno == EAGAIN)) {
|
|
return toto;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
got = rc;
|
|
toto += got;
|
|
if (got != iov[i].iov_len) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return toto;
|
|
}
|
|
|
|
/**
|
|
* Reads with maximum generality.
|
|
*
|
|
* @return number of bytes actually read, or -1 w/ errno
|
|
* @asyncsignalsafe
|
|
* @vforksafe
|
|
*/
|
|
ssize_t preadv(int fd, struct iovec *iov, int iovlen, int64_t off) {
|
|
ssize_t rc;
|
|
rc = Preadv(fd, iov, iovlen, off);
|
|
#if defined(SYSDEBUG) && _DATATRACE
|
|
if (UNLIKELY(__strace > 0)) {
|
|
kprintf(STRACE_PROLOGUE "preadv(%d, [", fd);
|
|
DescribeIov(iov, iovlen, rc != -1 ? rc : 0);
|
|
kprintf("], %d, %'ld) → %'ld% m\n", iovlen, off, rc);
|
|
}
|
|
#endif
|
|
return rc;
|
|
}
|