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pread_pwrite_ba.c
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#define EXTUNIX_WANT_PREAD
#define EXTUNIX_WANT_PWRITE
#include "config.h"
enum mode_bits {
BIT_ONCE = 1 << 0,
BIT_NOERROR = 1 << 1,
BIT_NOINTR = 1 << 2
};
#if defined(EXTUNIX_HAVE_PREAD)
/* Copyright © 2012 Goswin von Brederlow <[email protected]> */
CAMLprim value caml_extunixba_pread_common(value v_fd, off_t off, value v_buf, int mode) {
CAMLparam2(v_fd, v_buf);
ssize_t ret;
size_t fd = Int_val(v_fd);
size_t len = caml_ba_byte_size(Caml_ba_array_val(v_buf));
size_t processed = 0;
char *buf = (char*)Caml_ba_data_val(v_buf);
while(len > 0) {
caml_enter_blocking_section();
ret = pread(fd, buf, len, off);
caml_leave_blocking_section();
if (ret == 0) break;
if (ret == -1) {
if (errno == EINTR && (mode & BIT_NOINTR)) continue;
if (processed > 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) break;
if (mode & BIT_NOERROR) break;
}
uerror("pread", Nothing);
}
processed += ret;
buf += ret;
off += ret;
len -= ret;
if (mode & BIT_ONCE) break;
}
CAMLreturn(Val_long(processed));
}
value caml_extunixba_all_pread(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_NOINTR);
}
value caml_extunixba_single_pread(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_ONCE);
}
value caml_extunixba_pread(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_NOINTR | BIT_NOERROR);
}
value caml_extunixba_intr_pread(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_NOERROR);
}
value caml_extunixba_all_pread64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_NOINTR);
}
value caml_extunixba_single_pread64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_ONCE);
}
value caml_extunixba_pread64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_NOINTR | BIT_NOERROR);
}
value caml_extunixba_intr_pread64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pread_common(v_fd, off, v_buf, BIT_NOERROR);
}
#endif
#if defined(EXTUNIX_HAVE_PWRITE)
/* Copyright © 2012 Goswin von Brederlow <[email protected]> */
CAMLprim value caml_extunixba_pwrite_common(value v_fd, off_t off, value v_buf, int mode) {
CAMLparam2(v_fd, v_buf);
ssize_t ret;
size_t fd = Int_val(v_fd);
size_t len = caml_ba_byte_size(Caml_ba_array_val(v_buf));
size_t processed = 0;
char *buf = (char*)Caml_ba_data_val(v_buf);
while(len > 0) {
caml_enter_blocking_section();
ret = pwrite(fd, buf, len, off);
caml_leave_blocking_section();
if (ret == 0) break;
if (ret == -1) {
if (errno == EINTR && (mode & BIT_NOINTR)) continue;
if (processed > 0){
if (errno == EAGAIN || errno == EWOULDBLOCK) break;
if (mode & BIT_NOERROR) break;
}
uerror("pwrite", Nothing);
}
processed += ret;
buf += ret;
off += ret;
len -= ret;
if (mode & BIT_ONCE) break;
}
CAMLreturn(Val_long(processed));
}
value caml_extunixba_all_pwrite(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_NOINTR);
}
value caml_extunixba_single_pwrite(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_ONCE);
}
value caml_extunixba_pwrite(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_NOINTR | BIT_NOERROR);
}
value caml_extunixba_intr_pwrite(value v_fd, value v_off, value v_buf)
{
off_t off = Long_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_NOERROR);
}
value caml_extunixba_all_pwrite64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_NOINTR);
}
value caml_extunixba_single_pwrite64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_ONCE);
}
value caml_extunixba_pwrite64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_NOINTR | BIT_NOERROR);
}
value caml_extunixba_intr_pwrite64(value v_fd, value v_off, value v_buf)
{
off_t off = Int64_val(v_off);
return caml_extunixba_pwrite_common(v_fd, off, v_buf, BIT_NOERROR);
}
#endif
#if defined(EXTUNIX_HAVE_READ)
/* Copyright © 2012 Goswin von Brederlow <[email protected]> */
CAMLprim value caml_extunixba_read_common(value v_fd, value v_buf, int mode) {
CAMLparam2(v_fd, v_buf);
ssize_t ret;
size_t fd = Int_val(v_fd);
size_t len = caml_ba_byte_size(Caml_ba_array_val(v_buf));
size_t processed = 0;
char *buf = (char*)Caml_ba_data_val(v_buf);
while(len > 0) {
caml_enter_blocking_section();
ret = read(fd, buf, len);
caml_leave_blocking_section();
if (ret == 0) break;
if (ret == -1) {
if (errno == EINTR && (mode & BIT_NOINTR)) continue;
if (processed > 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) break;
if (mode & BIT_NOERROR) break;
}
uerror("read", Nothing);
}
processed += ret;
buf += ret;
len -= ret;
if (mode & BIT_ONCE) break;
}
CAMLreturn(Val_long(processed));
}
value caml_extunixba_all_read(value v_fd, value v_buf)
{
return caml_extunixba_read_common(v_fd, v_buf, BIT_NOINTR);
}
value caml_extunixba_single_read(value v_fd, value v_buf)
{
return caml_extunixba_read_common(v_fd, v_buf, BIT_ONCE);
}
value caml_extunixba_read(value v_fd, value v_buf)
{
return caml_extunixba_read_common(v_fd, v_buf, BIT_NOINTR | BIT_NOERROR);
}
value caml_extunixba_intr_read(value v_fd, value v_buf)
{
return caml_extunixba_read_common(v_fd, v_buf, BIT_NOERROR);
}
#endif
#if defined(EXTUNIX_HAVE_WRITE)
/* Copyright © 2012 Goswin von Brederlow <[email protected]> */
CAMLprim value caml_extunixba_write_common(value v_fd, value v_buf, int mode) {
CAMLparam2(v_fd, v_buf);
ssize_t ret;
size_t fd = Int_val(v_fd);
size_t len = caml_ba_byte_size(Caml_ba_array_val(v_buf));
size_t processed = 0;
char *buf = (char*)Caml_ba_data_val(v_buf);
while(len > 0) {
caml_enter_blocking_section();
ret = write(fd, buf, len);
caml_leave_blocking_section();
if (ret == 0) break;
if (ret == -1) {
if (errno == EINTR && (mode & BIT_NOINTR)) continue;
if (processed > 0){
if (errno == EAGAIN || errno == EWOULDBLOCK) break;
if (mode & BIT_NOERROR) break;
}
uerror("write", Nothing);
}
processed += ret;
buf += ret;
len -= ret;
if (mode & BIT_ONCE) break;
}
CAMLreturn(Val_long(processed));
}
value caml_extunixba_all_write(value v_fd, value v_buf)
{
return caml_extunixba_write_common(v_fd, v_buf, BIT_NOINTR);
}
value caml_extunixba_single_write(value v_fd, value v_buf)
{
return caml_extunixba_write_common(v_fd, v_buf, BIT_ONCE);
}
value caml_extunixba_write(value v_fd, value v_buf)
{
return caml_extunixba_write_common(v_fd, v_buf, BIT_NOINTR | BIT_NOERROR);
}
value caml_extunixba_intr_write(value v_fd, value v_buf)
{
return caml_extunixba_write_common(v_fd, v_buf, BIT_NOERROR);
}
#endif