6f46ff3765
and fix it for 32-bit ports defining sem_init@GLIBC_2.0 (i386, mips32, powerpc32) for glibc>=2.36. Fix https://github.com/llvm/llvm-project/issues/58079 Reviewed By: mgorny Differential Revision: https://reviews.llvm.org/D135023
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
// RUN: %clangxx -O0 -g %s -lutil -o %t && %run %t
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// This test depends on the glibc layout of struct sem_t and checks that we
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// don't leave sem_t::private uninitialized.
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// UNSUPPORTED: android, lsan-x86, ubsan
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#include <features.h>
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#include <assert.h>
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#include <semaphore.h>
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#include <string.h>
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#include <stdint.h>
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// musl and glibc's __HAVE_64B_ATOMICS==0 ports (e.g. arm, i386) use 32-bit sem
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// values. 64-bit glibc ports defining sem_init@GLIBC_2.0 (mips64) use 32-bit as
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// well, if the sem_init interceptor picks the oldest versioned symbol
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// (glibc<2.36, see https://sourceware.org/PR14932).
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#if !defined(__GLIBC__) || defined(__ILP32__) || \
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!__GLIBC_PREREQ(2, 36) && defined(__mips64__)
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typedef unsigned semval_t;
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#else
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typedef uint64_t semval_t;
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#endif
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// glibc __HAVE_64B_ATOMICS==0 ports define a sem_init which shifts the value by
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// 1 (https://sourceware.org/PR12674 glibc 2.21). The version is picked if
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// either glibc>=2.36 or sem_init@GLIBC_2.0 is absent (arm and newer ports).
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//
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// The __GLIBC_PREREQ check is brittle in that it requires matched
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// __GLIBC_PREREQ values for build time and run time.
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#if defined(__GLIBC__) && defined(__ILP32__) && \
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(__GLIBC_PREREQ(2, 36) || (__GLIBC_PREREQ(2, 21) && !defined(__i386__) && \
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!defined(__mips__) && !defined(__powerpc__)))
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# define GET_SEM_VALUE(V) ((V) >> 1)
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#else
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# define GET_SEM_VALUE(V) (V)
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#endif
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void my_sem_init(bool priv, int value, semval_t *a, unsigned char *b) {
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sem_t sem;
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memset(&sem, 0xAB, sizeof(sem));
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sem_init(&sem, priv, value);
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char *p = (char *)&sem;
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memcpy(a, p, sizeof(semval_t));
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memcpy(b, p + sizeof(semval_t), sizeof(char));
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sem_destroy(&sem);
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}
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int main() {
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semval_t a;
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unsigned char b;
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my_sem_init(false, 42, &a, &b);
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assert(GET_SEM_VALUE(a) == 42);
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assert(b != 0xAB);
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my_sem_init(true, 43, &a, &b);
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assert(GET_SEM_VALUE(a) == 43);
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assert(b != 0xAB);
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}
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