| 1 | #include <sys/types.h> |
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| 2 | #include <sys/stat.h> |
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| 3 | #include <unistd.h> |
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| 4 | #include <errno.h> |
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| 5 | #include <stdio.h> |
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| 6 | |
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| 7 | int |
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| 8 | main (int argc, char const **argv) |
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| 9 | { |
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| 10 | struct stat buf; |
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| 11 | int i, rv = 0; // Set breakpoint here. |
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| 12 | |
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| 13 | // Make sure stdin/stdout/stderr exist. |
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| 14 | for (i = 0; i <= 2; ++i) { |
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| 15 | if (fstat(fd: i, buf: &buf) != 0) |
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| 16 | return 1; |
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| 17 | } |
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| 18 | |
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| 19 | // Make sure no other file descriptors are open. |
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| 20 | for (i = 3; i <= 256; ++i) { |
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| 21 | if (fstat(fd: i, buf: &buf) == 0 || errno != EBADF) { |
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| 22 | fprintf(stderr, format: "File descriptor %d is open.\n" , i); |
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| 23 | rv = 2; |
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| 24 | } |
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| 25 | } |
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| 26 | |
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| 27 | return rv; |
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| 28 | } |
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| 29 | |
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