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e1ca3bf7ed
We have various options for strerror(), with ups and downsides:
- strerror()
- returns pointer that is overwritten on next call. It's convenient
to use, but dangerous.
- not thread-safe.
- not guaranteed to be UTF-8.
- strerror_r()
- takes input buffer and is less convenient to use. At least, we
are in control of when the buffer gets overwritten.
- there is a Posix/XSI and a glibc variant, making it sligthly
inconvenient to used. This could be solved by a wrapper we implement.
- thread-safe.
- not guaranteed to be UTF-8.
- g_strerror()
- convenient and safe to use. Also the buffer is never released for the
remainder of the program.
- passing untrusted error numbers to g_strerror() can result in a
denial of service, as the internal buffer grows until out-of-memory.
- thread-safe.
- guaranteed to be UTF-8 (depending on locale).
Add our own wrapper nm_strerror_native(). It is:
- convenient to use (returning a buffer that does not require
management).
- slightly dangerous as the buffer gets overwritten on the next call
(like strerror()).
- thread-safe.
- guaranteed to be UTF-8 (depending on locale).
- doesn't keep an unlimited cache of strings, unlike g_strerror().
You can't have it all. g_strerror() is leaking all generated error messages.
I think that is unacceptable, because it would mean we need to
keep track where our error numbers come from (and trust libraries we
use to only set a restricted set of known error numbers).
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| .. | ||
| tests | ||
| c-list-util.c | ||
| c-list-util.h | ||
| nm-c-list.h | ||
| nm-compat.c | ||
| nm-compat.h | ||
| nm-dedup-multi.c | ||
| nm-dedup-multi.h | ||
| nm-enum-utils.c | ||
| nm-enum-utils.h | ||
| nm-errno.c | ||
| nm-errno.h | ||
| nm-glib.h | ||
| nm-hash-utils.c | ||
| nm-hash-utils.h | ||
| nm-io-utils.c | ||
| nm-io-utils.h | ||
| nm-jansson.h | ||
| nm-logging-fwd.h | ||
| nm-macros-internal.h | ||
| nm-obj.h | ||
| nm-random-utils.c | ||
| nm-random-utils.h | ||
| nm-secret-utils.c | ||
| nm-secret-utils.h | ||
| nm-shared-utils.c | ||
| nm-shared-utils.h | ||
| nm-test-utils.h | ||
| nm-time-utils.c | ||
| nm-time-utils.h | ||
| nm-udev-utils.c | ||
| nm-udev-utils.h | ||
| nm-vpn-editor-plugin-call.h | ||
| nm-vpn-plugin-macros.h | ||
| nm-vpn-plugin-utils.c | ||
| nm-vpn-plugin-utils.h | ||
| unaligned.h | ||