ibv_free_device_list(3)

1IBV_GET_DEVICE_LIST(3)  Libibverbs Programmer's Manual  IBV_GET_DEVICE_LIST(3)
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NAME

6       ibv_get_device_list,  ibv_free_device_list  -  get  and release list of
7       available RDMA devices
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SYNOPSIS

10       #include <infiniband/verbs.h>
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12       struct ibv_device **ibv_get_device_list(int *num_devices);
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14       void ibv_free_device_list(struct ibv_device **list);
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DESCRIPTION

17       ibv_get_device_list() returns a NULL-terminated array of  RDMA  devices
18       currently  available.   The  argument  num_devices  is optional; if not
19       NULL, it is set to the number of devices returned in the array.
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21       ibv_free_device_list() frees the array  of  devices  list  returned  by
22       ibv_get_device_list().
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RETURN VALUE

25       ibv_get_device_list()  returns  the array of available RDMA devices, or
26       sets errno and returns NULL if the request fails.  If  no  devices  are
27       found then num_devices is set to 0, and non-NULL is returned.
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29       ibv_free_device_list() returns no value.
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ERRORS

32       EPERM  Permission denied.
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34       ENOSYS No kernel support for RDMA.
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36       ENOMEM Insufficient memory to complete the operation.
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NOTES

39       Client  code  should  open  all  the  devices  it  intends  to use with
40       ibv_open_device() before calling ibv_free_device_list().  Once it frees
41       the  array with ibv_free_device_list(), it will be able to use only the
42       open devices; pointers to unopened devices will no longer be valid.
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44       Setting the environment variable IBV_SHOW_WARNINGS will cause  warnings
45       to  be emitted to stderr if a kernel verbs device is discovered, but no
46       corresponding userspace driver can be found for it.
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AUTHORS

53       Dotan Barak <dotanba@gmail.com>
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57libibverbs                        2006-10-31            IBV_GET_DEVICE_LIST(3)