S_ISFIFO 197 usr/bin/ls/ls.c else if (S_ISFIFO(sp->st_mode)) S_ISFIFO 351 usr/bin/test/test.c return S_ISFIFO(s.st_mode); S_ISFIFO 360 usr/server/fs/fifofs/fifo_vnops.c if (!S_ISFIFO(mode))