| 1 | // RUN: %clangxx -g %s -o %t && %run %t | FileCheck %s |
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| 2 | // CHECK: 1 |
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| 3 | // CHECK-NEXT: 2 |
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| 4 | |
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| 5 | #include <assert.h> |
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| 6 | #include <stdio.h> |
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| 7 | |
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| 8 | int main(void) { |
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| 9 | // use a tool that produces different output than input to verify |
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| 10 | // that everything worked correctly |
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| 11 | FILE *fp = popen(command: "sort" , modes: "w" ); |
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| 12 | assert(fp); |
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| 13 | |
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| 14 | // verify that fileno() returns a meaningful descriptor (needed |
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| 15 | // for the implementation of TSan) |
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| 16 | assert(fileno(fp) != -1); |
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| 17 | |
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| 18 | assert(fputs("2\n" , fp) >= 0); |
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| 19 | assert(fputs("1\n" , fp) >= 0); |
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| 20 | assert(pclose(fp) == 0); |
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| 21 | |
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| 22 | return 0; |
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| 23 | } |
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| 24 | |
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