> Supposed to just print the first line?, instead, it prints: > > read: error reading /mnt/wsys/wctl: buffer too small > > Several guys from #plan9 in Freenode told me that that was happening > because of a missing newline.
not correct. it is happening because rio thinks the read requests too few bytes. sys/src/cmd/rio/xfid.c:791,796. read reads 1 byte at a time. it's not clear that read(5) expressly allows rio to error here, but it seems reasonable enough. read(1) uses realloc to allocate its buffer and would hang looking for a newline if rio allowed 1 byte reads. if /mnt/wsys/wctl produced a stream of output with no newlines, read would eventually fail like this ; time read</dev/zero read: malloc error: virtual memory allocation failed 156.51u 757.95s 916.67r read # status= malloc > But, is the current behavior correct? Or is it erroneous? while correct and consistent, a newline might have made life a tad easier for shell scripts. - erik
