mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-07-08 12:18:31 +00:00
Fix preadv() and pwritev()
This commit is contained in:
Justine Tunney
parent
827f25f054
commit
050062bcbb
4 changed files with 211 additions and 74 deletions
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@ -17,6 +17,20 @@ void __assert_fail(const char *, const char *, int) hidden relegated;
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#define static_assert _Static_assert
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#endif
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#define _unassert(x) \
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do { \
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if (__builtin_expect(!(x), 0)) { \
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unreachable; \
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} \
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} while (0)
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#define _npassert(x) \
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do { \
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if (__builtin_expect(!(x), 0)) { \
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notpossible; \
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} \
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} while (0)
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_ASSERT_H_ */
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@ -16,12 +16,15 @@
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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/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/strace.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/dce.h"
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#include "libc/errno.h"
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@ -33,74 +36,89 @@
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/sysv/consts/iov.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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static bool once, demodernize;
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int i, err;
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ssize_t rc;
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size_t got, toto;
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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 < 0) return einval();
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if (iovlen < 0) return einval();
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if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) return efault();
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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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} else if (IsWindows()) {
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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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} else if (IsMetal()) {
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return enosys();
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}
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if (iovlen == 1) {
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return sys_pread(fd, iov[0].iov_base, iov[0].iov_len, off, off);
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}
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/*
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* NT, 2018-era XNU, and 2007-era Linux don't support this system call
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*/
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if (!__vforked && !once) {
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err = errno;
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rc = sys_preadv(fd, iov, iovlen, off, off);
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if (rc == -1 && errno == ENOSYS) {
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errno = err;
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once = true;
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demodernize = true;
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STRACE("demodernizing %s() due to %s", "preadv", "ENOSYS");
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} else {
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once = true;
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return rc;
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}
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}
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if (!demodernize) {
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return sys_preadv(fd, iov, iovlen, off, off);
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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, NULL, 0, off, off);
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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 && (errno == EINTR || errno == EAGAIN)) {
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return toto;
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} else {
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return -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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@ -16,11 +16,13 @@
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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/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.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.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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@ -31,75 +33,90 @@
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/sysv/consts/iov.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 Pwritev(int fd, const struct iovec *iov, int iovlen,
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int64_t off) {
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static bool once, demodernize;
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int i, err;
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ssize_t rc;
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size_t sent, toto;
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int i, e;
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bool masked;
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size_t sent;
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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 < 0) return einval();
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if (iovlen < 0) return einval();
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if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) return efault();
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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return weaken(__zipos_write)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, off);
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} else if (IsWindows()) {
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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_write_nt(fd, iov, iovlen, off);
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} else {
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return ebadf();
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}
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} else if (IsMetal()) {
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return enosys();
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}
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if (iovlen == 1) {
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return sys_pwrite(fd, iov[0].iov_base, iov[0].iov_len, off, off);
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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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/*
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* NT, 2018-era XNU, and 2007-era Linux don't support this system call
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*/
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if (!once) {
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err = errno;
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rc = sys_pwritev(fd, iov, iovlen, off, off);
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if (rc == -1 && errno == ENOSYS) {
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errno = err;
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once = true;
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demodernize = true;
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STRACE("demodernizing %s() due to %s", "pwritev", "ENOSYS");
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} else {
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once = true;
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return rc;
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}
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}
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if (!demodernize) {
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return sys_pwritev(fd, iov, iovlen, off, off);
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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_pwrite(fd, NULL, 0, off, off);
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return sys_pwrite(fd, 0, 0, off, off);
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}
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if (iovlen == 1) {
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return sys_pwrite(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_pwritev(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_pwrite(fd, iov[i].iov_base, iov[i].iov_len, off, off);
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if (rc == -1) {
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if (toto && (errno == EINTR || errno == EAGAIN)) {
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return toto;
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} else {
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return -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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sent = rc;
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toto += sent;
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off += sent;
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if (sent != 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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