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Explain <isc/strerr.h> a little more

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The purpose of the `strerror_r()` wrapper was not obvious.
This commit is contained in:
Tony Finch 2022-12-16 13:30:39 +00:00
parent fe8e7e5958
commit b0893ae09a
3 changed files with 15 additions and 5 deletions
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3
CHANGES
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@ -1,3 +1,6 @@
6101. [port] Clarify the portability dodge needed for `strerror_r()`
[GL !7465]
6100. [cleanup] Deprecate <isc/deprecated.h>, because obsolete 6100. [cleanup] Deprecate <isc/deprecated.h>, because obsolete
functions are now deleted instead of marked with functions are now deleted instead of marked with
an attribute. [GL !7466] an attribute. [GL !7466]

4
lib/isc/include/isc/strerr.h
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@ -26,4 +26,8 @@
#if defined(strerror_r) #if defined(strerror_r)
#undef strerror_r #undef strerror_r
#endif /* if defined(strerror_r) */ #endif /* if defined(strerror_r) */
/*
* Ensure we use a consistent implementation of strerror_r()
*/
#define strerror_r isc_string_strerror_r #define strerror_r isc_string_strerror_r

13
lib/isc/string.c
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@ -55,6 +55,14 @@
#include <isc/string.h> /* IWYU pragma: keep */ #include <isc/string.h> /* IWYU pragma: keep */
/*
* We undef _GNU_SOURCE above to get the POSIX strerror_r()
*/
int
isc_string_strerror_r(int errnum, char *buf, size_t buflen) {
return (strerror_r(errnum, buf, buflen));
}
#if !defined(HAVE_STRLCPY) #if !defined(HAVE_STRLCPY)
size_t size_t
strlcpy(char *dst, const char *src, size_t size) { strlcpy(char *dst, const char *src, size_t size) {
@ -136,8 +144,3 @@ strnstr(const char *s, const char *find, size_t slen) {
return ((char *)s); return ((char *)s);
} }
#endif #endif
int
isc_string_strerror_r(int errnum, char *buf, size_t buflen) {
return (strerror_r(errnum, buf, buflen));
}