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util: retry opening a TTY on EIO

Browse Source 
https://bugs.freedesktop.org/show_bug.cgi?id=33996
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
This commit is contained in:
Lennart Poettering 2011-02-17 16:29:47 +01:00
parent fc116c6a19
commit f73f76acff
1 changed files with 25 additions and 1 deletions
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26
src/util.c
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@ -2134,8 +2134,32 @@ finish:
int open_terminal(const char *name, int mode) {
int fd, r;
unsigned c = 0;
if ((fd = open(name, mode)) < 0)
/*
* If a TTY is in the process of being closed opening it might
* cause EIO. This is horribly awful, but unlikely to be
* changed in the kernel. Hence we work around this problem by
* retrying a couple of times.
*
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
*/
for (;;) {
if ((fd = open(name, mode)) >= 0)
break;
if (errno != EIO)
return -errno;
if (c >= 20)
return -errno;
usleep(50 * USEC_PER_MSEC);
c++;
}
if (fd < 0)
return -errno;
if ((r = isatty(fd)) < 0) {