tree b57a62996a5ac8d994f0d04feca2f993c77aa047
parent f368d9fd26ae002fe2fce20add4cb2b806f48972
author A. Wilcox <AWilcox@Wilcox-Tech.com> 1552422682 -0500
committer Rich Felker <dalias@aerifal.cx> 1552423481 -0400

setvbuf: return failure if mode is invalid

POSIX requires setvbuf to return non-zero if `mode` is not one of _IONBF,
_IOLBF, or _IOFBF.