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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/lib/str_error_r.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/lib/str_error_r.c')
-rw-r--r-- | tools/lib/str_error_r.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tools/lib/str_error_r.c b/tools/lib/str_error_r.c new file mode 100644 index 000000000..6aad8308a --- /dev/null +++ b/tools/lib/str_error_r.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 +#undef _GNU_SOURCE +#include <string.h> +#include <stdio.h> +#include <linux/string.h> + +/* + * The tools so far have been using the strerror_r() GNU variant, that returns + * a string, be it the buffer passed or something else. + * + * But that, besides being tricky in cases where we expect that the function + * using strerror_r() returns the error formatted in a provided buffer (we have + * to check if it returned something else and copy that instead), breaks the + * build on systems not using glibc, like Alpine Linux, where musl libc is + * used. + * + * So, introduce yet another wrapper, str_error_r(), that has the GNU + * interface, but uses the portable XSI variant of strerror_r(), so that users + * rest asured that the provided buffer is used and it is what is returned. + */ +char *str_error_r(int errnum, char *buf, size_t buflen) +{ + int err = strerror_r(errnum, buf, buflen); + if (err) + snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err); + return buf; +} |