d814006c0a
With ASan testing enabled on SPARC as per PR #107405, the ``` AddressSanitizer-sparc-sunos-dynamic :: TestCases/Posix/coverage-fork.cpp ``` test occasionally `FAIL`s on Solaris/sparcv9: ``` compiler-rt/test/asan/TestCases/Posix/coverage-fork.cpp:46:15: error: CHECK-DAG: expected string not found in input // CHECK-DAG: Parent PID: [[ParentPID:[0-9]+]] ^ ``` It turns out that the output for parent and child processes is interleaved like ``` Parent PID: Child PID: 27426 27425 ``` Checking with `truss` shows that the `fprintf`s are implemented as 3 separate `write`s: ``` 28489: write(2, " P a r e n t P I D : ", 12) = 12 28489: write(2, " 2 8 4 8 9", 5) = 5 28489: write(2, "\n", 1) = 1 ``` To avoid this, this patch switches the test to use `snprintf`/`write` to guarantee the output is atomic. Tested on `sparcv9-sun-solaris2.11`, `amd64-pc-solaris2.11`, and `x86_64-pc-linux-gnu`.
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
// RUN: %clangxx_asan -fsanitize-coverage=func,trace-pc-guard %s -o %t
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// RUN: rm -rf %t-dir
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// RUN: mkdir -p %t-dir && cd %t-dir
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// RUN: %env_asan_opts=coverage=1:verbosity=1 %run %t 2>&1 | FileCheck %s
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//
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// UNSUPPORTED: android
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// UNSUPPORTED: iossim
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//
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// Ideally a forked-subprocess should only report it's own coverage,
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// not parent's one. But trace-pc-guard currently does nothing special for fork,
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// and thus this test is relaxed.
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#include <stdio.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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__attribute__((noinline))
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void foo() { printf("foo\n"); }
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__attribute__((noinline))
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void bar() { printf("bar\n"); }
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__attribute__((noinline))
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void baz() { printf("baz\n"); }
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int main(int argc, char **argv) {
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pid_t child_pid = fork();
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char buf[100];
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if (child_pid == 0) {
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snprintf(buf, sizeof(buf), "Child PID: %ld\n", (long)getpid());
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write(2, buf, strlen(buf));
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baz();
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} else {
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snprintf(buf, sizeof(buf), "Parent PID: %ld\n", (long)getpid());
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write(2, buf, strlen(buf));
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foo();
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bar();
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// Wait for the child process(s) to finish
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while (wait(NULL) > 0)
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;
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}
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return 0;
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}
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// CHECK-DAG: Child PID: [[ChildPID:[0-9]+]]
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// CHECK-DAG: [[ChildPID]].sancov: {{.*}} PCs written
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// CHECK-DAG: Parent PID: [[ParentPID:[0-9]+]]
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// CHECK-DAG: [[ParentPID]].sancov: 3 PCs written
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