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gst_writev: respect IOV_MAX for the writev iovec array #439

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This commit is contained in:
Jim Mason 2019-09-06 19:23:01 +01:00
parent 7774aae713
commit dc5250e751
1 changed files with 11 additions and 3 deletions
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14
plugins/elements/gstelements_private.c
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@ -127,19 +127,27 @@ struct iovec
#define FDSINK_MAX_ALLOCA_SIZE (64 * 1024) /* 64k */ #define FDSINK_MAX_ALLOCA_SIZE (64 * 1024) /* 64k */
#define FDSINK_MAX_MALLOC_SIZE ( 8 * 1024 * 1024) /* 8M */ #define FDSINK_MAX_MALLOC_SIZE ( 8 * 1024 * 1024) /* 8M */
/* UIO_MAXIOV is documented in writev(2), but <sys/uio.h> only /* UIO_MAXIOV is documented in writev(2) on osx/ios, but <sys/uio.h>
* declares it on osx/ios if defined(KERNEL) */ * only declares it if defined(KERNEL) */
#ifndef UIO_MAXIOV #ifndef UIO_MAXIOV
#define UIO_MAXIOV 512 #define UIO_MAXIOV 512
#endif #endif
/*
* POSIX writev(2) documents IOV_MAX as the max length of the iov array.
* If IOV_MAX is undefined, fall back to the legacy UIO_MAXIOV.
*/
#ifndef IOV_MAX
#define IOV_MAX UIO_MAXIOV
#endif
static gssize static gssize
gst_writev (gint fd, const struct iovec *iov, gint iovcnt, gsize total_bytes) gst_writev (gint fd, const struct iovec *iov, gint iovcnt, gsize total_bytes)
{ {
gssize written; gssize written;
#ifdef HAVE_SYS_UIO_H #ifdef HAVE_SYS_UIO_H
if (iovcnt <= UIO_MAXIOV) { if (iovcnt <= IOV_MAX) {
do { do {
written = writev (fd, iov, iovcnt); written = writev (fd, iov, iovcnt);
} while (written < 0 && errno == EINTR); } while (written < 0 && errno == EINTR);