> I found a !! in glusterfs sources. Is it a C syntax I do not know, a > bug, or just a weird syntax? > > xlators/cluster/afr/src/afr-inode-write.c: > local->stable_write = !!((fd->flags|flags)&(O_SYNC|O_DSYNC));
It's a common idiom in the Linux kernel/coreutils community. I thought it was in BSD too. It's a convenient way to coerce any arbitrary non-zero integer value into a specific value of one, for code that uses integers as booleans. I wouldn't assume it's a bug, since that seems to be precisely what's called for in the snippet you provided, but I guess that means it's weird syntax. _______________________________________________ Gluster-devel mailing list [email protected] http://www.gluster.org/mailman/listinfo/gluster-devel
