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Diffstat (limited to 'erts/emulator/drivers/unix')
-rw-r--r--erts/emulator/drivers/unix/unix_efile.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/erts/emulator/drivers/unix/unix_efile.c b/erts/emulator/drivers/unix/unix_efile.c
index d2d8713c1e..9160e2aed2 100644
--- a/erts/emulator/drivers/unix/unix_efile.c
+++ b/erts/emulator/drivers/unix/unix_efile.c
@@ -1427,6 +1427,9 @@ efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset,
}
#ifdef HAVE_SENDFILE
+
+// For some reason the maximum size_t cannot be used as the max size
+// 3GB seems to work on all platforms
#define SENDFILE_CHUNK_SIZE ((1 << 30) -1)
/*
@@ -1435,7 +1438,13 @@ efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset,
* we have to emulate some things in linux and play with variables on
* bsd/darwin.
*
- * It could be possible to implement header/trailer in sendfile, though
+ * All of the calls will split a command which tries to send more than
+ * SENDFILE_CHUNK_SIZE of data at once.
+ *
+ * On platforms where *nbytes of 0 does not mean the entire file, this is
+ * simulated.
+ *
+ * It could be possible to implement header/trailer in sendfile. Though
* you would have to emulate it in linux and on BSD/Darwin some complex
* calculations have to be made when using a non blocking socket to figure
* out how much of the header/file/trailer was sent in each command.
@@ -1446,10 +1455,10 @@ efile_sendfile(Efile_error* errInfo, int in_fd, int out_fd,
off_t *offset, Uint64 *nbytes, struct t_sendfile_hdtl* hdtl)
{
Uint64 written = 0;
-#if defined(__linux__) || (defined(__sun) && defined(__SVR4))
+#if defined(__linux__)
ssize_t retval;
do {
- // check if *nbytes is 0 or greater than the largest size_t
+ // check if *nbytes is 0 or greater than chunk size
if (*nbytes == 0 || *nbytes > SENDFILE_CHUNK_SIZE)
retval = sendfile(out_fd, in_fd, offset, SENDFILE_CHUNK_SIZE);
else
@@ -1461,11 +1470,34 @@ efile_sendfile(Efile_error* errInfo, int in_fd, int out_fd,
} while (retval != -1 && retval == SENDFILE_CHUNK_SIZE);
*nbytes = written;
return check_error(retval == -1 ? -1 : 0, errInfo);
+#elif defined(__sun) && defined(__SVR4) && defined(HAVE_SENDFILEV)
+ ssize_t retval;
+ size_t len;
+ sendfilevec_t fdrec;
+ fdrec.sfv_fd = in_fd;
+ fdrec.sfv_flag = 0;
+ do {
+ fdrec.sfv_off = *offset;
+ len = 0;
+ // check if *nbytes is 0 or greater than chunk size
+ if (*nbytes == 0 || *nbytes > SENDFILE_CHUNK_SIZE)
+ fdrec.sfv_len = SENDFILE_CHUNK_SIZE;
+ else
+ fdrec.sfv_len = *nbytes;
+ retval = sendfilev(out_fd, &fdrec, 1, &len);
+ if (retval != -1 || errno == EAGAIN || errno == EINTR) {
+ *offset += len;
+ *nbytes -= len;
+ written += len;
+ }
+ } while (len == SENDFILE_CHUNK_SIZE);
+ *nbytes = written;
+ return check_error(retval == -1 ? -1 : 0, errInfo);
#elif defined(DARWIN)
int retval;
off_t len;
do {
- // check if *nbytes is 0 or greater than the largest off_t
+ // check if *nbytes is 0 or greater than chunk size
if(*nbytes > SENDFILE_CHUNK_SIZE)
len = SENDFILE_CHUNK_SIZE;
else