mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
b41f91c658
The cosmopolitan command interpreter now has 13 builtin commands, variable support, support for ; / && / || syntax, asynchronous support, and plenty of unit tests with bug fixes. This change fixes a bug in posix_spawn() with null envp arg. strace logging now uses atomic writes for scatter functions. Breaking change renaming GetCpuCount() to _getcpucount(). TurfWar is now updated to use the new token bucket algorithm. WIN32 affinity masks now inherit across fork() and execve().
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/iovec.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/likely.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/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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static ssize_t Preadv(int fd, struct iovec *iov, int iovlen, int64_t off) {
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int e, i;
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size_t got;
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bool masked;
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ssize_t rc, toto;
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sigset_t mask, oldmask;
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if (fd < 0) {
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return ebadf();
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}
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if (iovlen < 0) {
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return einval();
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}
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if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) {
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return efault();
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}
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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return _weaken(__zipos_read)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, off);
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}
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if (IsMetal()) {
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return espipe(); // must be serial or console if not zipos
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}
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if (IsWindows()) {
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if (fd < g_fds.n) {
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return sys_read_nt(g_fds.p + fd, iov, iovlen, off);
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} else {
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return ebadf();
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}
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}
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while (iovlen && !iov->iov_len) {
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--iovlen;
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++iov;
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}
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if (!iovlen) {
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return sys_pread(fd, 0, 0, off, off);
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}
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if (iovlen == 1) {
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return sys_pread(fd, iov->iov_base, iov->iov_len, off, off);
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}
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e = errno;
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rc = sys_preadv(fd, iov, iovlen, off, off);
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if (rc != -1 || errno != ENOSYS) return rc;
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errno = e;
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for (toto = i = 0; i < iovlen; ++i) {
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rc = sys_pread(fd, iov[i].iov_base, iov[i].iov_len, off, off);
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if (rc == -1) {
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if (!toto) {
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toto = -1;
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}
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break;
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}
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got = rc;
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toto += got;
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off += got;
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if (got != iov[i].iov_len) {
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break;
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}
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if (!masked) {
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sigfillset(&mask);
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_npassert(!sys_sigprocmask(SIG_SETMASK, &mask, &oldmask));
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masked = true;
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}
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}
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if (masked) {
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_npassert(!sys_sigprocmask(SIG_SETMASK, &oldmask, 0));
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}
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return toto;
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}
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/**
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* Reads with maximum generality.
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*
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* @return number of bytes actually read, or -1 w/ errno
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* @asyncsignalsafe
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* @vforksafe
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*/
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ssize_t preadv(int fd, struct iovec *iov, int iovlen, int64_t off) {
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ssize_t rc;
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rc = Preadv(fd, iov, iovlen, off);
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STRACE("preadv(%d, [%s], %d, %'ld) → %'ld% m", fd,
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DescribeIovec(rc, iov, iovlen), iovlen, off, rc);
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return rc;
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}
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