minimal example filesystem that prints out all capabilities supported by the kernel and then exits.
 
 
#define FUSE_USE_VERSION 31
 
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
 
struct fuse_session *se;
 
struct cap_info {
        uint64_t flag;
        const char *name;
};
 
static const struct cap_info capabilities[] = {
    
    {0, NULL} 
};
 
{
        printf("Capabilities:\n");
        for (const struct cap_info *cap = capabilities; cap->name != NULL; cap++) {
                if (fuse_get_feature_flag(conn, cap->flag)) {
                        printf("\t%s\n", cap->name);
                }
        }
}
 
{
        (void) userdata;
 
        print_capabilities(conn);
}
 
 
};
 
int main(int argc, char **argv)
{
        char *mountpoint;
        int ret = -1;
 
        mountpoint = strdup("/tmp/fuse_printcap_XXXXXX");
        if(mkdtemp(mountpoint) == NULL) {
                perror("mkdtemp");
                return 1;
        }
 
 
        se = fuse_session_new(&args, &pc_oper,
                              sizeof(pc_oper), NULL);
        if (se == NULL)
            goto err_out1;
 
            goto err_out2;
 
            goto err_out3;
 
 
err_out3:
err_out2:
err_out1:
        rmdir(mountpoint);
        free(mountpoint);
 
        return ret ? 1 : 0;
}
#define FUSE_CAP_IOCTL_DIR
#define FUSE_CAP_DONT_MASK
#define FUSE_CAP_HANDLE_KILLPRIV
#define FUSE_CAP_AUTO_INVAL_DATA
int fuse_set_signal_handlers(struct fuse_session *se)
#define FUSE_CAP_HANDLE_KILLPRIV_V2
#define FUSE_CAP_SPLICE_READ
#define FUSE_CAP_PARALLEL_DIROPS
#define FUSE_CAP_WRITEBACK_CACHE
#define FUSE_CAP_EXPIRE_ONLY
#define FUSE_CAP_ATOMIC_O_TRUNC
#define FUSE_CAP_ASYNC_READ
#define FUSE_CAP_SPLICE_WRITE
#define FUSE_CAP_CACHE_SYMLINKS
#define FUSE_CAP_POSIX_ACL
#define FUSE_CAP_EXPORT_SUPPORT
#define FUSE_CAP_POSIX_LOCKS
#define FUSE_CAP_EXPLICIT_INVAL_DATA
#define FUSE_CAP_READDIRPLUS_AUTO
#define FUSE_CAP_NO_OPENDIR_SUPPORT
#define FUSE_CAP_ASYNC_DIO
#define FUSE_CAP_PASSTHROUGH
#define FUSE_CAP_DIRECT_IO_ALLOW_MMAP
#define FUSE_CAP_NO_OPEN_SUPPORT
#define FUSE_CAP_READDIRPLUS
const char * fuse_pkgversion(void)
void fuse_remove_signal_handlers(struct fuse_session *se)
#define FUSE_CAP_SETXATTR_EXT
#define FUSE_CAP_SPLICE_MOVE
#define FUSE_CAP_NO_EXPORT_SUPPORT
#define FUSE_CAP_FLOCK_LOCKS
void fuse_session_destroy(struct fuse_session *se)
void fuse_session_exit(struct fuse_session *se)
int fuse_session_loop(struct fuse_session *se)
void fuse_session_unmount(struct fuse_session *se)
int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
void fuse_lowlevel_version(void)
void fuse_opt_free_args(struct fuse_args *args)
#define FUSE_ARGS_INIT(argc, argv)
void(* init)(void *userdata, struct fuse_conn_info *conn)