| 1 | |
| 2 | #undef _GNU_SOURCE
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| 3 | #include <string.h>
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| 4 | #include <stdio.h>
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| 5 | #include <linux/string.h>
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| 6 |
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| 7 | |
| 8 | * The tools so far have been using the strerror_r() GNU variant, that returns
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| 9 | * a string, be it the buffer passed or something else.
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| 10 | *
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| 11 | * But that, besides being tricky in cases where we expect that the function
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| 12 | * using strerror_r() returns the error formatted in a provided buffer (we have
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| 13 | * to check if it returned something else and copy that instead), breaks the
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| 14 | * build on systems not using glibc, like Alpine Linux, where musl libc is
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| 15 | * used.
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| 16 | *
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| 17 | * So, introduce yet another wrapper, str_error_r(), that has the GNU
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| 18 | * interface, but uses the portable XSI variant of strerror_r(), so that users
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| 19 | * rest asured that the provided buffer is used and it is what is returned.
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| 20 |
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| 21 | char *str_error_r(int errnum, char *buf, size_t buflen)
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| 22 | {
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| 23 | int err = strerror_r(errnum, buf, buflen);
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| 24 | if (err)
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| 25 | snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err);
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| 26 | return buf;
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| 27 | }
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