From 8781c1301d55db0a95398eb24c11b99205706bae Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Thu, 14 Nov 2019 18:18:24 -0300 Subject: misc: Set generic pselect as ENOSYS The generic pselect implementation has the very specific race condition that motived the creation of the pselect syscall (no atomicity in signal mask set/reset). Using it as generic implementation is counterproductive Also currently only microblaze uses it as fallback when used on kernel prior 3.15. This patch moves the generic implementation to a microblaze specific one, sets the generic internal as a ENOSYS, and cleanups the Linux generic implementation. The microblaze implementation mimics the previous Linux generic one, where it either uses pselect6 directly if __ASSUME_PSELECT or a first try pselect6 then the fallback otherwise. Checked on x86_64-linux-gnu and microblaze-linux-gnu. --- misc/pselect.c | 46 +++------------------------------------------- 1 file changed, 3 insertions(+), 43 deletions(-) (limited to 'misc/pselect.c') diff --git a/misc/pselect.c b/misc/pselect.c index 76ded85..b53d9cd 100644 --- a/misc/pselect.c +++ b/misc/pselect.c @@ -17,12 +17,7 @@ . */ #include -#include -#include /* For NULL. */ -#include #include -#include - /* Check the first NFDS descriptors each in READFDS (if not NULL) for read readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS @@ -34,43 +29,8 @@ int __pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, const struct timespec *timeout, const sigset_t *sigmask) { - struct timeval tval; - int retval; - sigset_t savemask; - - /* Change nanosecond number to microseconds. This might mean losing - precision and therefore the `pselect` should be available. But - for now it is hardly found. */ - if (timeout != NULL) - { - /* Catch bugs which would be hidden by the TIMESPEC_TO_TIMEVAL - computations. The division by 1000 truncates values. */ - if (__glibc_unlikely (timeout->tv_nsec < 0)) - { - __set_errno (EINVAL); - return -1; - } - - TIMESPEC_TO_TIMEVAL (&tval, timeout); - } - - /* The setting and restoring of the signal mask and the select call - should be an atomic operation. This can't be done without kernel - help. */ - if (sigmask != NULL) - __sigprocmask (SIG_SETMASK, sigmask, &savemask); - - /* Note the pselect() is a cancellation point. But since we call - select() which itself is a cancellation point we do not have - to do anything here. */ - retval = __select (nfds, readfds, writefds, exceptfds, - timeout != NULL ? &tval : NULL); - - if (sigmask != NULL) - __sigprocmask (SIG_SETMASK, &savemask, NULL); - - return retval; + __set_errno (ENOSYS); + return -1; } -#ifndef __pselect weak_alias (__pselect, pselect) -#endif +stub_warning (pselect) -- cgit v1.1