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| author | Zegang <zegang.luo@qq.com> | 2025-01-08 14:50:30 +0800 |
|---|---|---|
| committer | Bernd Schubert <bernd@bsbernd.com> | 2025-02-10 16:56:45 +0100 |
| commit | d7246542dbe1ece84b88013843dc7a9bb9c81b6f (patch) | |
| tree | cdd77ebadc11d746c5899dc0a50794fd71a3a3fd | |
| parent | 1d134a0ccf8fe95ceb1ea3cdd723cb30c5cfcdf1 (diff) | |
| download | libfuse-d7246542dbe1ece84b88013843dc7a9bb9c81b6f.tar.gz | |
Identify the FD hold by parent process
Issue:
There is no directly way to get the FD
hold by parent process which asked do fuse mount.
Use Case:
For auto_unmount case, identify the FD can easy to close
the FD and make automatically unmount manually and explicitly.
The FD[1] can be got via getenv(FUSE_COMMFD2_ENV).
One potential use case is to satisfy FD-Leak checks.
Solution:
Add an extra env _FUSE_COMMFD2 to store the FD.
This will provide a easy way to get the FD via FUSE_COMMFD2_ENV.
Signed-off-by: Zegang Luo <zegang.luo@qq.com>
| -rw-r--r-- | lib/mount.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/mount.c b/lib/mount.c index aedd9b9..7dd727c 100644 --- a/lib/mount.c +++ b/lib/mount.c @@ -48,6 +48,7 @@ #define FUSERMOUNT_PROG "fusermount3" #define FUSE_COMMFD_ENV "_FUSE_COMMFD" +#define FUSE_COMMFD2_ENV "_FUSE_COMMFD2" #ifndef MS_DIRSYNC #define MS_DIRSYNC 128 @@ -367,6 +368,14 @@ static int setup_auto_unmount(const char *mountpoint, int quiet) char arg_fd_entry[30]; snprintf(arg_fd_entry, sizeof(arg_fd_entry), "%i", fds[0]); setenv(FUSE_COMMFD_ENV, arg_fd_entry, 1); + /* + * This helps to identify the FD hold by parent process. + * In auto-unmount case, parent process can close this FD explicitly to do unmount. + * The FD[1] can be got via getenv(FUSE_COMMFD2_ENV). + * One potential use case is to satisfy FD-Leak checks. + */ + snprintf(arg_fd_entry, sizeof(arg_fd_entry), "%i", fds[1]); + setenv(FUSE_COMMFD2_ENV, arg_fd_entry, 1); char const *const argv[] = { FUSERMOUNT_PROG, @@ -431,6 +440,14 @@ static int fuse_mount_fusermount(const char *mountpoint, struct mount_opts *mo, char arg_fd_entry[30]; snprintf(arg_fd_entry, sizeof(arg_fd_entry), "%i", fds[0]); setenv(FUSE_COMMFD_ENV, arg_fd_entry, 1); + /* + * This helps to identify the FD hold by parent process. + * In auto-unmount case, parent process can close this FD explicitly to do unmount. + * The FD[1] can be got via getenv(FUSE_COMMFD2_ENV). + * One potential use case is to satisfy FD-Leak checks. + */ + snprintf(arg_fd_entry, sizeof(arg_fd_entry), "%i", fds[1]); + setenv(FUSE_COMMFD2_ENV, arg_fd_entry, 1); char const *const argv[] = { FUSERMOUNT_PROG, |