On Thu, 17 Jun 2021 08:50:51 -0300 Adhemerval Zanella wrote: > For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit > syscall if the provided timeout fits in a 32-bit one. The 64-bit > usage should be rare since the timeout is a relative one. This also > avoids the need to use supports_time64() (which breaks the usage case > of live migration like CRIU or similar). > > Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel > (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. > --- > misc/Makefile | 9 ++ > misc/tst-pselect.c | 120 > ++++++++---------- .../unix/sysv/linux/microblaze/pselect32.c | > 3 +- sysdeps/unix/sysv/linux/pselect.c | 47 ++++--- > sysdeps/unix/sysv/linux/pselect32.c | 6 - > 5 files changed, 95 insertions(+), 90 deletions(-) > > diff --git a/misc/Makefile b/misc/Makefile > index f34ab09fe3..fa40bf0e11 100644 > --- a/misc/Makefile > +++ b/misc/Makefile > @@ -148,6 +148,12 @@ CFLAGS-brk.op = $(no-stack-protector) > > include ../Rules > > +ifeq (yes,$(build-shared)) > +librt = $(common-objpfx)rt/librt.so > +else > +librt = $(common-objpfx)rt/librt.a > +endif > + > $(objpfx)libg.a: $(dep-dummy-lib); $(make-dummy-lib) > > $(objpfx)tst-tsearch: $(libm) > @@ -162,3 +168,6 @@ tst-allocate_once-ENV = > MALLOC_TRACE=$(objpfx)tst-allocate_once.mtrace > $(objpfx)tst-allocate_once-mem.out: $(objpfx)tst-allocate_once.out > $(common-objpfx)malloc/mtrace $(objpfx)tst-allocate_once.mtrace > $@; > \ $(evaluate-test) + > +$(objpfx)tst-pselect: $(librt) > +$(objpfx)tst-pselect-time64: $(librt) > diff --git a/misc/tst-pselect.c b/misc/tst-pselect.c > index c89176b058..f8c404c275 100644 > --- a/misc/tst-pselect.c > +++ b/misc/tst-pselect.c > @@ -16,14 +16,14 @@ > . */ > > #include > -#include > -#include > -#include > -#include > -#include > +#include > +#include > +#include > +#include > +#include > +#include > #include > > - > static volatile int handler_called; > > static void > @@ -33,59 +33,43 @@ handler (int sig) > } > > > -static int > -do_test (void) > +static void > +test_pselect_basic (void) > { > struct sigaction sa; > sa.sa_handler = handler; > sa.sa_flags = 0; > sigemptyset (&sa.sa_mask); > > - if (sigaction (SIGUSR1, &sa, NULL) != 0) > - { > - puts ("sigaction failed"); > - return 1; > - } > + xsigaction (SIGUSR1, &sa, NULL); > > sa.sa_handler = SIG_IGN; > - if (sigaction (SIGCHLD, &sa, NULL) != 0) > - { > - puts ("2nd sigaction failed"); > - return 1; > - } > + xsigaction (SIGCHLD, &sa, NULL); > > sigset_t ss_usr1; > sigemptyset (&ss_usr1); > sigaddset (&ss_usr1, SIGUSR1); > - if (sigprocmask (SIG_BLOCK, &ss_usr1, NULL) != 0) > - { > - puts ("sigprocmask failed"); > - return 1; > - } > + TEST_COMPARE (sigprocmask (SIG_BLOCK, &ss_usr1, NULL), 0); > > int fds[2][2]; > - > - if (pipe (fds[0]) != 0 || pipe (fds[1]) != 0) > - { > - puts ("pipe failed"); > - return 1; > - } > + xpipe (fds[0]); > + xpipe (fds[1]); > > fd_set rfds; > FD_ZERO (&rfds); > > sigset_t ss; > - sigprocmask (SIG_SETMASK, NULL, &ss); > + TEST_COMPARE (sigprocmask (SIG_SETMASK, NULL, &ss), 0); > sigdelset (&ss, SIGUSR1); > > struct timespec to = { .tv_sec = 0, .tv_nsec = 500000000 }; > > pid_t parent = getpid (); > - pid_t p = fork (); > + pid_t p = xfork (); > if (p == 0) > { > - close (fds[0][1]); > - close (fds[1][0]); > + xclose (fds[0][1]); > + xclose (fds[1][0]); > > FD_SET (fds[0][0], &rfds); > > @@ -93,55 +77,63 @@ do_test (void) > do > { > if (getppid () != parent) > - exit (2); > + FAIL_EXIT1 ("getppid()=%d != parent=%d", getppid(), > parent); > errno = 0; > e = pselect (fds[0][0] + 1, &rfds, NULL, NULL, &to, &ss); > } > while (e == 0); > > - if (e != -1) > - { > - puts ("child: pselect did not fail"); > - return 0; > - } > - if (errno != EINTR) > - { > - puts ("child: pselect did not set errno to EINTR"); > - return 0; > - } > + TEST_COMPARE (e, -1); > + TEST_COMPARE (errno, EINTR); > > TEMP_FAILURE_RETRY (write (fds[1][1], "foo", 3)); > > exit (0); > } > > - close (fds[0][0]); > - close (fds[1][1]); > + xclose (fds[0][0]); > + xclose (fds[1][1]); > > FD_SET (fds[1][0], &rfds); > > - kill (p, SIGUSR1); > + TEST_COMPARE (kill (p, SIGUSR1), 0); > > int e = pselect (fds[1][0] + 1, &rfds, NULL, NULL, NULL, &ss); > - if (e == -1) > - { > - puts ("parent: pselect failed"); > - return 1; > - } > - if (e != 1) > - { > - puts ("parent: pselect did not report readable fd"); > - return 1; > - } > - if (!FD_ISSET (fds[1][0], &rfds)) > - { > - puts ("parent: pselect reports wrong fd"); > - return 1; > - } > + TEST_COMPARE (e, 1); > + TEST_VERIFY (FD_ISSET (fds[1][0], &rfds)); > +} > + > +static void > +test_pselect_large_timeout (void) > +{ > + support_create_timer (0, 100000000, false, NULL); > + > + int fds[2]; > + xpipe (fds); > + > + fd_set rfds; > + FD_ZERO (&rfds); > + FD_SET (fds[0], &rfds); > + > + sigset_t ss; > + TEST_COMPARE (sigprocmask (SIG_SETMASK, NULL, &ss), 0); > + sigdelset (&ss, SIGALRM); > + > + struct timespec ts = { TYPE_MAXIMUM (time_t), 0 }; > + > + TEST_COMPARE (pselect (fds[0] + 1, &rfds, NULL, NULL, &ts, &ss), > -1); > + TEST_VERIFY (errno == EINTR || errno == EOVERFLOW); > +} > + > +static int > +do_test (void) > +{ > + test_pselect_basic (); > + > + test_pselect_large_timeout (); > > return 0; > } > > -#define TEST_FUNCTION do_test () > -#include "../test-skeleton.c" > +#include > diff --git a/sysdeps/unix/sysv/linux/microblaze/pselect32.c > b/sysdeps/unix/sysv/linux/microblaze/pselect32.c index > a4f436462b..70b7b52a48 100644 --- > a/sysdeps/unix/sysv/linux/microblaze/pselect32.c +++ > b/sysdeps/unix/sysv/linux/microblaze/pselect32.c @@ -35,8 +35,7 @@ > __pselect32 (int nfds, fd_set *readfds, fd_set *writefds, struct > timeval tv32, *ptv32 = NULL; if (timeout != NULL) > { > - if (! in_time_t_range (timeout->tv_sec) > - || ! valid_nanoseconds (timeout->tv_nsec)) > + if (! valid_nanoseconds (timeout->tv_nsec)) > { > __set_errno (EINVAL); > return -1; > diff --git a/sysdeps/unix/sysv/linux/pselect.c > b/sysdeps/unix/sysv/linux/pselect.c index 5e8a0cc2dc..79e8584ea7 > 100644 --- a/sysdeps/unix/sysv/linux/pselect.c > +++ b/sysdeps/unix/sysv/linux/pselect.c > @@ -18,7 +18,23 @@ > > #include > #include > -#include > + > +static int > +pselect64_syscall (int nfds, fd_set *readfds, fd_set *writefds, > + fd_set *exceptfds, const struct __timespec64 > *timeout, > + const sigset_t *sigmask) > +{ > +#ifndef __NR_pselect6_time64 > +# define __NR_pselect6_time64 __NR_pselect6 > +#endif > + /* NB: This is required by ARGIFY used in x32 internal_syscallN. > */ > + __syscall_ulong_t data[2] = > + { > + (uintptr_t) sigmask, __NSIG_BYTES > + }; > + return SYSCALL_CANCEL (pselect6_time64, nfds, readfds, writefds, > exceptfds, > + timeout, data); > +} > > int > __pselect64 (int nfds, fd_set *readfds, fd_set *writefds, fd_set > *exceptfds, @@ -37,30 +53,25 @@ __pselect64 (int nfds, fd_set > *readfds, fd_set *writefds, fd_set *exceptfds, we can only pass in 6 > directly. If there is an architecture with support for more > parameters a new version of this file needs to be created. */ > - > -#ifndef __NR_pselect6_time64 > -# define __NR_pselect6_time64 __NR_pselect6 > -#endif > +#ifdef __ASSUME_TIME64_SYSCALLS > + return pselect64_syscall (nfds, readfds, writefds, exceptfds, > timeout, > + sigmask); > +#else > + bool is32bit = timeout != NULL > + ? in_time_t_range (timeout->tv_sec) : true; > int r; > - if (supports_time64 ()) > + if (!is32bit) > { > - /* NB: This is required by ARGIFY used in x32 > internal_syscallN. */ > - __syscall_ulong_t data[2] = > - { > - (uintptr_t) sigmask, __NSIG_BYTES > - }; > - r = SYSCALL_CANCEL (pselect6_time64, nfds, readfds, writefds, > exceptfds, > - timeout, data); > + r = pselect64_syscall (nfds, readfds, writefds, exceptfds, > timeout, > + sigmask); > if (r == 0 || errno != ENOSYS) > return r; > - > - mark_time64_unsupported (); > + __set_errno (EOVERFLOW); > + return -1; > } > > -#ifndef __ASSUME_TIME64_SYSCALLS > - r = __pselect32 (nfds, readfds, writefds, exceptfds, timeout, > sigmask); > + return __pselect32 (nfds, readfds, writefds, exceptfds, timeout, > sigmask); #endif > - return r; > } > > #if __TIMESIZE != 64 > diff --git a/sysdeps/unix/sysv/linux/pselect32.c > b/sysdeps/unix/sysv/linux/pselect32.c index eb59b51cdf..48724d8727 > 100644 --- a/sysdeps/unix/sysv/linux/pselect32.c > +++ b/sysdeps/unix/sysv/linux/pselect32.c > @@ -29,12 +29,6 @@ __pselect32 (int nfds, fd_set *readfds, fd_set > *writefds, struct timespec ts32, *pts32 = NULL; > if (timeout != NULL) > { > - if (! in_time_t_range (timeout->tv_sec)) > - { > - __set_errno (EINVAL); > - return -1; > - } > - > ts32 = valid_timespec64_to_timespec (*timeout); > pts32 = &ts32; > } Reviewed-by: Lukasz Majewski Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de