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nfs_readlink2: Return symlink without incurring ENAMETOOLONG 

Signed-off-by: Earl Chew <earl_chew@yahoo.com>
libnfs-4.0.0-vitalif
Earl Chew 2017-05-08 21:56:50 -07:00
parent e788078e20
commit e74846219a
2 changed files with 53 additions and 0 deletions
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10
include/nfsc/libnfs.h
View File

@ -1091,6 +1091,16 @@ EXTERN int nfs_readlink_async(struct nfs_context *nfs, const char *path, nfs_cb
*/
EXTERN int nfs_readlink(struct nfs_context *nfs, const char *path, char *buf, int bufsize);
/*
* Sync readlink2(<name>)
* Function returns
* 0 : The operation was successful.
* -errno : The command failed.
* *bufptr : NULL if the command failed, otherwise the contents of the symlink.
* The caller must free the buffer.
*/
EXTERN int nfs_readlink2(struct nfs_context *nfs, const char *path, char **bufptr);
/*

43
lib/libnfs-sync.c
View File

@ -1003,6 +1003,49 @@ int nfs_readlink(struct nfs_context *nfs, const char *path, char *buf, int bufsi
return cb_data.status;
}
static void readlink2_cb(int status, struct nfs_context *nfs, void *data, void *private_data)
{
struct sync_cb_data *cb_data = private_data;
char **bufptr;
char *buf;
cb_data->is_finished = 1;
cb_data->status = status;
if (status < 0) {
nfs_set_error(nfs, "readlink call failed with \"%s\"", (char *)data);
return;
}
buf = strdup(data);
if (buf == NULL) {
cb_data->status = errno ? -errno : -ENOMEM;
return;
}
bufptr = cb_data->return_data;
if (bufptr)
*bufptr = buf;
}
int nfs_readlink2(struct nfs_context *nfs, const char *path, char **bufptr)
{
struct sync_cb_data cb_data;
*bufptr = NULL;
cb_data.is_finished = 0;
cb_data.return_data = bufptr;
if (nfs_readlink_async(nfs, path, readlink2_cb, &cb_data) != 0) {
nfs_set_error(nfs, "nfs_readlink_async failed");
return -1;
}
wait_for_nfs_reply(nfs, &cb_data);
return cb_data.status;
}
/*