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eeb20775d2
This will help C++ code that uses exceptions to be tinier. For example, this change shaves away 1000 lines of assembly code from LLVM's libcxx, which is 0.7% of all assembly instructions in the entire library.
64 lines
3.2 KiB
C
64 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above 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 │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/stat.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/runtime/zipos.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Returns information about file, via open()'d descriptor.
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*
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* On Windows, this implementation always sets `st_uid` and `st_gid` to
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* `getuid()` and `getgid()`. The `st_mode` field is generated based on
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* the current umask().
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*
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* @return 0 on success or -1 w/ errno
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* @raise EBADF if `fd` isn't a valid file descriptor
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* @raise EIO if an i/o error happens while reading from file system
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* @raise EOVERFLOW shouldn't be possible on 64-bit systems
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* @asyncsignalsafe
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*/
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int fstat(int fd, struct stat *st) {
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int rc;
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if (IsAsan() && !__asan_is_valid(st, sizeof(*st))) {
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rc = efault();
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} else if (__isfdkind(fd, kFdZip)) {
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rc = _weaken(__zipos_fstat)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, st);
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} else if (IsLinux() || IsXnu() || IsFreebsd() || IsOpenbsd() || IsNetbsd()) {
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rc = sys_fstat(fd, st);
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} else if (IsMetal()) {
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rc = sys_fstat_metal(fd, st);
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} else if (IsWindows()) {
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rc = sys_fstat_nt(fd, st);
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} else {
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rc = enosys();
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}
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STRACE("fstat(%d, [%s]) → %d% m", fd, DescribeStat(rc, st), rc);
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return rc;
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}
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__weak_reference(fstat, fstat64);
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