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Diffstat (limited to 'libc/sysdeps/linux/common/bits/sigset.h')
-rw-r--r--libc/sysdeps/linux/common/bits/sigset.h152
1 files changed, 105 insertions, 47 deletions
diff --git a/libc/sysdeps/linux/common/bits/sigset.h b/libc/sysdeps/linux/common/bits/sigset.h
index 9a16e5cb9..7ec87eb1d 100644
--- a/libc/sysdeps/linux/common/bits/sigset.h
+++ b/libc/sysdeps/linux/common/bits/sigset.h
@@ -22,13 +22,26 @@
typedef int __sig_atomic_t;
-/* A `sigset_t' has a bit for each signal. */
-
-# define _SIGSET_NWORDS (1024 / (8 * sizeof (unsigned long int)))
-typedef struct
- {
- unsigned long int __val[_SIGSET_NWORDS];
- } __sigset_t;
+/* A 'sigset_t' has a bit for each signal.
+ * glibc has space for 1024 signals (!), but most arches supported
+ * by Linux have 64 signals, and only MIPS has 128.
+ * There seems to be some historical baggage in sparc[64]
+ * where they might have (or had in the past) 32 signals only,
+ * I hope it's irrelevant now.
+ * Signal 0 does not exist, so we have signals 1..64, not 0..63.
+ * Note that struct sigaction has embedded sigset_t,
+ * and this necessitates translation in sigaction()
+ * to convert it to struct kernel_sigaction.
+ * See libc/.../sigaction.c, libc/.../kernel_sigaction.h
+ */
+#if defined(__mips__)
+# define _SIGSET_NWORDS (128 / (8 * sizeof (unsigned long)))
+#else
+# define _SIGSET_NWORDS (64 / (8 * sizeof (unsigned long)))
+#endif
+typedef struct {
+ unsigned long __val[_SIGSET_NWORDS];
+} __sigset_t;
#endif
@@ -47,53 +60,98 @@ typedef struct
# endif
/* Return a mask that includes the bit for SIG only. */
+/* Unsigned cast ensures shift/mask insns are used. */
# define __sigmask(sig) \
- (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
+ (((unsigned long) 1) << ((unsigned)((sig) - 1) % (8 * sizeof (unsigned long))))
/* Return the word index for SIG. */
-# define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned long int)))
+# define __sigword(sig) ((unsigned)((sig) - 1) / (8 * sizeof (unsigned long)))
+
+/* gcc 4.3.1 is not clever enough to optimize for _SIGSET_NWORDS == 1 and 2,
+ * which are about the only values which can be there */
# if defined __GNUC__ && __GNUC__ >= 2
# define __sigemptyset(set) \
- (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
- sigset_t *__set = (set); \
- while (--__cnt >= 0) __set->__val[__cnt] = 0; \
- 0; }))
+(__extension__ ({ \
+ sigset_t *__set = (set); \
+ if (_SIGSET_NWORDS <= 2) { \
+ __set->__val[0] = 0; \
+ if (_SIGSET_NWORDS == 2) \
+ __set->__val[1] = 0; \
+ } else { \
+ int __cnt = _SIGSET_NWORDS; \
+ while (--__cnt >= 0) __set->__val[__cnt] = 0; \
+ } \
+ 0; \
+}))
# define __sigfillset(set) \
- (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
- sigset_t *__set = (set); \
- while (--__cnt >= 0) __set->__val[__cnt] = ~0UL; \
- 0; }))
+(__extension__ ({ \
+ sigset_t *__set = (set); \
+ if (_SIGSET_NWORDS <= 2) { \
+ __set->__val[0] = ~0UL; \
+ if (_SIGSET_NWORDS == 2) \
+ __set->__val[1] = ~0UL; \
+ } else { \
+ int __cnt = _SIGSET_NWORDS; \
+ while (--__cnt >= 0) __set->__val[__cnt] = ~0UL; \
+ } \
+ 0; \
+}))
# ifdef __USE_GNU
/* The POSIX does not specify for handling the whole signal set in one
command. This is often wanted and so we define three more functions
here. */
# define __sigisemptyset(set) \
- (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
- const sigset_t *__set = (set); \
- int __ret = __set->__val[--__cnt]; \
- while (!__ret && --__cnt >= 0) \
- __ret = __set->__val[__cnt]; \
- __ret == 0; }))
+(__extension__ ({ \
+ long __ret; \
+ const sigset_t *__set = (set); \
+ if (_SIGSET_NWORDS == 1) { \
+ __ret = __set->__val[0]; \
+ } else if (_SIGSET_NWORDS == 2) { \
+ __ret = __set->__val[0] | __set->__val[1]; \
+ } else { \
+ int __cnt = _SIGSET_NWORDS; \
+ __ret = __set->__val[--__cnt]; \
+ while (!__ret && --__cnt >= 0) \
+ __ret = __set->__val[__cnt]; \
+ } \
+ __ret == 0; \
+}))
# define __sigandset(dest, left, right) \
- (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
- sigset_t *__dest = (dest); \
- const sigset_t *__left = (left); \
- const sigset_t *__right = (right); \
- while (--__cnt >= 0) \
- __dest->__val[__cnt] = (__left->__val[__cnt] \
- & __right->__val[__cnt]); \
- 0; }))
+(__extension__ ({ \
+ sigset_t *__dest = (dest); \
+ const sigset_t *__left = (left); \
+ const sigset_t *__right = (right); \
+ if (_SIGSET_NWORDS <= 2) { \
+ __dest->__val[0] = __left->__val[0] & __right->__val[0];\
+ if (_SIGSET_NWORDS == 2) \
+ __dest->__val[1] = __left->__val[1] & __right->__val[1];\
+ } else { \
+ int __cnt = _SIGSET_NWORDS; \
+ while (--__cnt >= 0) \
+ __dest->__val[__cnt] = (__left->__val[__cnt] \
+ & __right->__val[__cnt]); \
+ } \
+ 0; \
+}))
# define __sigorset(dest, left, right) \
- (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
- sigset_t *__dest = (dest); \
- const sigset_t *__left = (left); \
- const sigset_t *__right = (right); \
- while (--__cnt >= 0) \
- __dest->__val[__cnt] = (__left->__val[__cnt] \
- | __right->__val[__cnt]); \
- 0; }))
+(__extension__ ({ \
+ sigset_t *__dest = (dest); \
+ const sigset_t *__left = (left); \
+ const sigset_t *__right = (right); \
+ if (_SIGSET_NWORDS <= 2) { \
+ __dest->__val[0] = __left->__val[0] | __right->__val[0];\
+ if (_SIGSET_NWORDS == 2) \
+ __dest->__val[1] = __left->__val[1] | __right->__val[1];\
+ } else { \
+ int __cnt = _SIGSET_NWORDS; \
+ while (--__cnt >= 0) \
+ __dest->__val[__cnt] = (__left->__val[__cnt] \
+ | __right->__val[__cnt]); \
+ } \
+ 0; \
+}))
# endif
# endif
@@ -108,14 +166,14 @@ extern int __sigdelset (__sigset_t *, int);
libc_hidden_proto(__sigdelset)
# ifdef __USE_EXTERN_INLINES
-# define __SIGSETFN(NAME, BODY, CONST) \
- _EXTERN_INLINE int \
- NAME (CONST __sigset_t *__set, int __sig) \
- { \
- unsigned long int __mask = __sigmask (__sig); \
- unsigned long int __word = __sigword (__sig); \
- return BODY; \
- }
+# define __SIGSETFN(NAME, BODY, CONST) \
+_EXTERN_INLINE int \
+NAME (CONST __sigset_t *__set, int __sig) \
+{ \
+ unsigned long __mask = __sigmask (__sig); \
+ unsigned long __word = __sigword (__sig); \
+ return BODY; \
+}
__SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
__SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-05 22:50:37 +0000