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consolidated IOV_MAX/UIO_MAXIOV handling per GLib + legacy behaviour for osx/ios

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This commit is contained in:
Jim Mason 2019-09-07 12:32:40 +01:00
parent dc5250e751
commit a4aa2256d1
1 changed files with 17 additions and 12 deletions
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29
plugins/elements/gstelements_private.c
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@ -127,18 +127,23 @@ struct iovec
#define FDSINK_MAX_ALLOCA_SIZE (64 * 1024) /* 64k */
#define FDSINK_MAX_MALLOC_SIZE ( 8 * 1024 * 1024) /* 8M */
/* UIO_MAXIOV is documented in writev(2) on osx/ios, but <sys/uio.h>
/* Adapted from GLib (gio/gioprivate.h)
*
* POSIX defines IOV_MAX/UIO_MAXIOV as the maximum number of iovecs that can
* be sent in one go. We define our own version of it here as there are two
* possible names, and also define a fall-back value if none of the constants
* are defined */
#if defined(IOV_MAX)
#define GST_IOV_MAX IOV_MAX
#elif defined(UIO_MAXIOV)
#define GST_IOV_MAX UIO_MAXIOV
#elif defined(__APPLE__)
/* For osx/ios, UIO_MAXIOV is documented in writev(2), but <sys/uio.h>
* only declares it if defined(KERNEL) */
#ifndef UIO_MAXIOV
#define UIO_MAXIOV 512
#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
#define GST_IOV_MAX 512
#else
/* 16 is the minimum value required by POSIX */
#define GST_IOV_MAX 16
#endif
static gssize
@ -147,7 +152,7 @@ gst_writev (gint fd, const struct iovec *iov, gint iovcnt, gsize total_bytes)
gssize written;
#ifdef HAVE_SYS_UIO_H
if (iovcnt <= IOV_MAX) {
if (iovcnt <= GST_IOV_MAX) {
do {
written = writev (fd, iov, iovcnt);
} while (written < 0 && errno == EINTR);