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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-10-22 20:01:33 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-10-22 20:01:33 +0200 |
| commit | 6d90ddf4a8f6263180949345f510a95af2146606 (patch) | |
| tree | f3144ad5f4cee426cac40d417807496f5f1534d6 | |
| parent | 6a870e98d7f94402e83c02e9d7dfffb15f9013e4 (diff) | |
document which posix version supports realpath(NULL)
| -rw-r--r-- | hurd/porting/guidelines.mdwn | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/hurd/porting/guidelines.mdwn b/hurd/porting/guidelines.mdwn index 33888685..867b78cb 100644 --- a/hurd/porting/guidelines.mdwn +++ b/hurd/porting/guidelines.mdwn @@ -140,8 +140,15 @@ for a potential corresponding `PATH_MAX` macro. They are not a replacement for Note 2: Yes, some POSIX functions such as `realpath()` actually assume that `PATH_MAX` is defined. This is a bug of the POSIX standard, which got fixed in -the latest revisions, in which one can simply pass `NULL` to get a dynamically -allocated buffer. +POSIX 2001, in which one can simply pass `NULL` to get a dynamically +allocated buffer. One can thus use: + + #if _POSIX_VERSION >= 200112 || defined(__GLIBC__) + char *path = realpath(orig, NULL); + #else + char path[PATH_MATH]; + realpath(orig, path); + #endif ## <a name="ARG_MAX"> `ARG_MAX` </a> |