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-rw-r--r--erts/emulator/drivers/common/efile_drv.c8
-rw-r--r--erts/emulator/drivers/common/erl_efile.h2
-rw-r--r--erts/emulator/drivers/unix/unix_efile.c97
-rw-r--r--erts/emulator/drivers/win32/win_efile.c3
4 files changed, 46 insertions, 64 deletions
diff --git a/erts/emulator/drivers/common/efile_drv.c b/erts/emulator/drivers/common/efile_drv.c
index b132991a3b..36ed108b76 100644
--- a/erts/emulator/drivers/common/efile_drv.c
+++ b/erts/emulator/drivers/common/efile_drv.c
@@ -1385,7 +1385,11 @@ static void invoke_writev(void *data) {
size = d->c.writev.size;
}
- /* Copy the io vector to avoid locking the port que while writing */
+ /* Copy the io vector to avoid locking the port que while writing,
+ * also, both we and efile_writev might/will change the SysIOVec
+ * when segmenting or due to partial write and we do not want to
+ * tamper with the actual queue that we get from driver_peekq
+ */
MUTEX_LOCK(d->c.writev.q_mtx); /* Lock before accessing the port queue */
iov0 = driver_peekq(d->c.writev.port, &iovlen);
@@ -1424,7 +1428,7 @@ static void invoke_writev(void *data) {
} else {
d->result_ok = efile_writev(&d->errInfo,
d->flags, (int) d->fd,
- iov, iovcnt, size);
+ iov, iovcnt);
}
} else if (iovlen == 0) {
d->result_ok = 1;
diff --git a/erts/emulator/drivers/common/erl_efile.h b/erts/emulator/drivers/common/erl_efile.h
index 3868b38137..69ad02633c 100644
--- a/erts/emulator/drivers/common/erl_efile.h
+++ b/erts/emulator/drivers/common/erl_efile.h
@@ -162,7 +162,7 @@ int efile_write_info(Efile_error* errInfo, Efile_info* pInfo, char *name);
int efile_write(Efile_error* errInfo, int flags, int fd,
char* buf, size_t count);
int efile_writev(Efile_error* errInfo, int flags, int fd,
- SysIOVec* iov, int iovcnt, size_t size);
+ SysIOVec* iov, int iovcnt);
int efile_read(Efile_error* errInfo, int flags, int fd,
char* buf, size_t count, size_t* pBytesRead);
int efile_seek(Efile_error* errInfo, int fd,
diff --git a/erts/emulator/drivers/unix/unix_efile.c b/erts/emulator/drivers/unix/unix_efile.c
index 7cf0a712ce..e7dd9d2bdb 100644
--- a/erts/emulator/drivers/unix/unix_efile.c
+++ b/erts/emulator/drivers/unix/unix_efile.c
@@ -1004,13 +1004,11 @@ efile_writev(Efile_error* errInfo, /* Where to return error codes */
* opened */
int fd, /* File descriptor to write to */
SysIOVec* iov, /* Vector of buffer structs.
- * The structs are unchanged
- * after the call */
- int iovcnt, /* Number of structs in vector */
- size_t size) /* Number of bytes to write */
+ * The structs may be changed i.e.
+ * due to incomplete writes */
+ int iovcnt) /* Number of structs in vector */
{
int cnt = 0; /* Buffers so far written */
- int p = 0; /* Position in next buffer */
ASSERT(iovcnt >= 0);
@@ -1021,66 +1019,47 @@ efile_writev(Efile_error* errInfo, /* Where to return error codes */
#endif
while (cnt < iovcnt) {
+ if ((! iov[cnt].iov_base) || (iov[cnt].iov_len <= 0)) {
+ /* Empty buffer - skip */
+ cnt++;
+ } else { /* Non-empty buffer */
+ ssize_t w; /* Bytes written in this call */
#ifdef HAVE_WRITEV
- int w; /* Bytes written in this call */
- int b = iovcnt - cnt; /* Buffers to write */
- if (b > MAXIOV)
- b = MAXIOV;
- if (iov[cnt].iov_base && iov[cnt].iov_len > 0) {
- if (b == 1) {
- /* Degenerated io vector */
- do {
- w = write(fd, iov[cnt].iov_base + p, iov[cnt].iov_len - p);
- } while (w < 0 && errno == EINTR);
- } else {
- /* Non-empty vector first.
- * Adjust pos in first buffer in case of
- * previous incomplete writev */
- iov[cnt].iov_base += p;
- iov[cnt].iov_len -= p;
+ int b = iovcnt - cnt; /* Buffers to write */
+ /* Use as many buffers as MAXIOV allows */
+ if (b > MAXIOV)
+ b = MAXIOV;
+ if (b > 1) {
do {
w = writev(fd, &iov[cnt], b);
} while (w < 0 && errno == EINTR);
- iov[cnt].iov_base -= p;
- iov[cnt].iov_len += p;
- }
- if (w < 0)
- return check_error(-1, errInfo);
- } else {
- /* Empty vector first - skip */
- cnt++;
- continue;
- }
- ASSERT(w >= 0);
- /* Move forward to next vector to write */
- for (; cnt < iovcnt; cnt++) {
- if (iov[cnt].iov_base && iov[cnt].iov_len > 0) {
- if (w < iov[cnt].iov_len)
- break;
- else
- w -= iov[cnt].iov_len;
- }
- }
- ASSERT(w >= 0);
- p = w > 0 ? w : 0; /* Skip p bytes next writev */
-#else /* #ifdef HAVE_WRITEV */
- if (iov[cnt].iov_base && iov[cnt].iov_len > 0) {
- /* Non-empty vector */
- int w; /* Bytes written in this call */
- while (p < iov[cnt].iov_len) {
- do {
- w = write(fd, iov[cnt].iov_base + p, iov[cnt].iov_len - p);
- } while (w < 0 && errno == EINTR);
- if (w < 0)
- return check_error(-1, errInfo);
- p += w;
+ } else
+ /* Degenerated io vector - use regular write */
+#endif
+ {
+ do {
+ w = write(fd, iov[cnt].iov_base, iov[cnt].iov_len);
+ } while (w < 0 && errno == EINTR);
+ ASSERT(w <= iov[cnt].iov_len);
+ }
+ if (w < 0) return check_error(-1, errInfo);
+ /* Move forward to next buffer to write */
+ for (; cnt < iovcnt && w > 0; cnt++) {
+ if (iov[cnt].iov_base && iov[cnt].iov_len > 0) {
+ if (w < iov[cnt].iov_len) {
+ /* Adjust the buffer for next write */
+ iov[cnt].iov_len -= w;
+ iov[cnt].iov_base += w;
+ w = 0;
+ break;
+ } else {
+ w -= iov[cnt].iov_len;
+ }
+ }
}
- }
- cnt++;
- p = 0;
-#endif /* #ifdef HAVE_WRITEV */
+ ASSERT(w == 0);
+ } /* else Non-empty buffer */
} /* while (cnt< iovcnt) */
- size = 0; /* Avoid compiler warning */
return 1;
}
diff --git a/erts/emulator/drivers/win32/win_efile.c b/erts/emulator/drivers/win32/win_efile.c
index 0d3d334154..606fa1d7de 100644
--- a/erts/emulator/drivers/win32/win_efile.c
+++ b/erts/emulator/drivers/win32/win_efile.c
@@ -1115,8 +1115,7 @@ efile_writev(Efile_error* errInfo, /* Where to return error codes */
SysIOVec* iov, /* Vector of buffer structs.
* The structs are unchanged
* after the call */
- int iovcnt, /* Number of structs in vector */
- size_t size) /* Number of bytes to write */
+ int iovcnt) /* Number of structs in vector */
{
int cnt; /* Buffers so far written */
OVERLAPPED overlapped;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 11:03:57 +0000