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azbox: add cDemux hack to avoid segfaults/corruption

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Origin commit data
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Branch: master
Commit: 2e20b8f2b6
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2013-09-22 (Sun, 22 Sep 2013)


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This commit was generated by Migit
This commit is contained in:
Stefan Seyfried
2013-09-22 14:44:29 +02:00
parent fafdfbf884
commit 980c5c2f92
1 changed files with 10 additions and 9 deletions
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19
azbox/dmx.cpp
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@@ -211,10 +211,11 @@ int cDemux::Read(unsigned char *buff, int len, int timeout)
#endif
int rc;
int to = timeout;
struct pollfd ufds;
ufds.fd = fd;
ufds.events = POLLIN|POLLPRI|POLLERR;
ufds.revents = 0;
/* using a one-dimensional array seems to avoid strange segfaults / memory corruption?? */
struct pollfd ufds[1];
ufds[0].fd = fd;
ufds[0].events = POLLIN|POLLPRI|POLLERR;
ufds[0].revents = 0;
/* hack: if the frontend loses and regains lock, the demuxer often will not
* return from read(), so as a "emergency exit" for e.g. NIT scan, set a (long)
@@ -225,7 +226,7 @@ int cDemux::Read(unsigned char *buff, int len, int timeout)
if (to > 0)
{
retry:
rc = ::poll(&ufds, 1, to);
rc = ::poll(ufds, 1, to);
if (!rc)
{
if (timeout == 0) /* we took the emergency exit */
@@ -252,14 +253,14 @@ int cDemux::Read(unsigned char *buff, int len, int timeout)
return 0;
}
#endif
if (ufds.revents & POLLHUP) /* we get POLLHUP if e.g. a too big DMX_BUFFER_SIZE was set */
if (ufds[0].revents & POLLHUP) /* we get POLLHUP if e.g. a too big DMX_BUFFER_SIZE was set */
{
dmx_err("received %s,", "POLLHUP", ufds.revents);
dmx_err("received %s,", "POLLHUP", ufds[0].revents);
return -1;
}
if (!(ufds.revents & POLLIN)) /* we requested POLLIN but did not get it? */
if (!(ufds[0].revents & POLLIN)) /* we requested POLLIN but did not get it? */
{
dmx_err("received %s, please report!", "POLLIN", ufds.revents);
dmx_err("received %s, please report!", "POLLIN", ufds[0].revents);
return 0;
}
}