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Fix bug in handling errno from lseek()

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This commit is contained in:
Andrew Bettison 2013-08-26 17:38:37 +09:30
parent 9c49abd431
commit 1b26917f58
1 changed files with 10 additions and 8 deletions
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18
overlay_interface.c
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@ -885,14 +885,16 @@ overlay_broadcast_ensemble(struct network_destination *destination,
/* This lseek() is unneccessary because the dummy file is opened in O_APPEND mode. It's
only purpose is to find out the offset to print in the DEBUG statement. It is vulnerable
to a race condition with other processes appending to the same file. */
off_t fsize = lseek(interface->alarm.poll.fd, (off_t) 0, SEEK_END);
/* Don't complain if the seek fails because we are writing to a pipe or device that does
not support seeking. */
if (errno!=ESPIPE) {
if (fsize == -1)
return WHY_perror("lseek");
if (config.debug.overlayinterfaces)
DEBUGF("Write to interface %s at offset=%zu", interface->name, fsize);
if (config.debug.overlayinterfaces) {
off_t fsize = lseek(interface->alarm.poll.fd, (off_t) 0, SEEK_END);
if (fsize == -1) {
/* Don't complain if the seek fails because we are writing to a pipe or device that does
not support seeking. */
if (errno != ESPIPE)
return WHY_perror("lseek");
DEBUGF("Write to interface %s at unknown offset", interface->name);
} else
DEBUGF("Write to interface %s at offset=%llu", interface->name, (long long)fsize);
}
ssize_t nwrite = write(interface->alarm.poll.fd, &packet, sizeof(packet));
if (nwrite == -1)