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errno-util: add new errno_or_else() helper

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This commit is contained in:
Lennart Poettering 2019-07-04 17:55:36 +02:00
parent 4747b645c6
commit fed813778f
1 changed files with 11 additions and 0 deletions
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11
src/basic/errno-util.h
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@ -36,6 +36,17 @@ static inline char *strerror_safe(int error) {
return strerror(abs(error));
}
static inline int errno_or_else(int fallback) {
/* To be used when invoking library calls where errno handling is not defined clearly: we return
* errno if it is set, and the specified error otherwise. The idea is that the caller initializes
* errno to zero before doing an API call, and then uses this helper to retrieve a somewhat useful
* error code */
if (errno > 0)
return -errno;
return -abs(fallback);
}
/* Hint #1: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5.
*
* Hint #2: The kernel sends e.g., EHOSTUNREACH or ENONET to userspace in some ICMP error cases. See the