need to interpose `*at(AT_FDCWD`

musec / libpreopen

Library for wrapping libc functions that require ambient authority

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need to interpose `*at(AT_FDCWD` #11

Open emaste opened 5 years ago

emaste commented 5 years ago

Some software calls *at() functions with AT_FDCWD instead of plain functions. Notably, this is true for anything using fts(). fts() calls fstatat() always.

libpreopen must interpose these *at() functions, performing a find_relative() in the AT_FDCWD case.

emaste commented 5 years ago

These:

faccessat
bindat
chflagsat
fchmodat
fchownat
connectat
fhlinkat
getfhat
linkat
mkdirat
mkfifoat
mknodat
openat
readlinkat
renameat
fstatat
symlinkat
unlinkat

Ericson2314 commented 5 years ago

https://github.com/CraneStation/wasi-sysroot/issues/42 We've hit this with WASI too.