diff options
Diffstat (limited to 'tools/lib')
-rw-r--r-- | tools/lib/str_error_r.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tools/lib/str_error_r.c b/tools/lib/str_error_r.c new file mode 100644 index 000000000000..503ae072244c --- /dev/null +++ b/tools/lib/str_error_r.c @@ -0,0 +1,26 @@ +#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, %p, %zd)=%d", errnum, buf, buflen, err); + return buf; +} |