3 commits

Author	SHA1	Message	Date
ridiculousfish	11a373f121	Prevent redirecting internal processes to file descriptors above 2 ... The user may write for example: echo foo >&5 and fish would try to output to file descriptor 5, within the fish process itself. This has unpredictable effects and isn't useful. Make this an error. Note that the reverse is "allowed" but ignored: echo foo 5>&1 this conceptually dup2s stdout to fd 5, but since no builtin writes to fd 5 we ignore it.	2021-02-20 16:16:45 -08:00
ridiculousfish	9be77d1f9c	Correctly handle "self fd redirections" ... This adds a test for the obscure case where an fd is redirected to itself. This is tricky because the dup2 will not clear the CLO_EXEC bit. So do it manually; also posix_spawn can't be used in this case.	2019-12-13 16:51:49 -08:00
ridiculousfish	d6c71d77a9	Correctly cloexec file redirections ... The IO cleanup left file redirections open in the child. For example, /bin/cmd < file.txt would redirect stdin but also leave the file open. Ensure these get closed properly.	2019-12-13 16:16:19 -08:00