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linux: Fix __NSIG_WORDS and add __NSIG_BYTES

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The __NSIG_WORDS value is based on minimum number of words to hold
the maximum number of signals supported by the architecture.

This patch also adds __NSIG_BYTES, which is the number of bytes
required to represent the supported number of signals.  It is used in
syscalls which takes a sigset_t.

Checked on x86_64-linux-gnu and i686-linux-gnu.

Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella
2020-04-23 10:58:01 -03:00
parent f13d260190
commit f26d456b98
15 changed files with 42 additions and 27 deletions
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16
sysdeps/unix/sysv/linux/sigsetops.h
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@ -20,23 +20,31 @@
#define _SIGSETOPS_H 1
#include <signal.h>
#include <limits.h>
#include <libc-pointer-arith.h>
/* Return a mask that includes the bit for SIG only. */
# define __sigmask(sig) \
(((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
#define __sigmask(sig) \
(1UL << (((sig) - 1) % ULONG_WIDTH))
/* Return the word index for SIG. */
static inline unsigned long int
__sigword (int sig)
{
return (sig - 1) / (8 * sizeof (unsigned long int));
return (sig - 1) / ULONG_WIDTH;
}
/* Linux sig* functions only handle up to __NSIG_WORDS words instead of
full _SIGSET_NWORDS sigset size. The signal numbers are 1-based, and
bit 0 of a signal mask is for signal 1. */
#define __NSIG_WORDS (ALIGN_UP ((_NSIG - 1), ULONG_WIDTH) / ULONG_WIDTH)
_Static_assert (__NSIG_WORDS <= _SIGSET_NWORDS,
"__NSIG_WORDS > _SIGSET_WORDS");
# define __NSIG_WORDS (_NSIG / (8 * sizeof (unsigned long int )))
/* This macro is used on syscall that takes a sigset_t to specify the expected
size in bytes. As for glibc, kernel sigset is implemented as an array of
unsigned long. */
#define __NSIG_BYTES (__NSIG_WORDS * (ULONG_WIDTH / UCHAR_WIDTH))
static inline void
__sigemptyset (sigset_t *set)