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ibv_is_fork_initialized(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHOR | COLOPHON 

IBV_IS_...TIALIZED(3) Libibverbs Programmer’s ManualIBV_IS_...TIALIZED(3)

NAME         top

       ibv_is_fork_initialized - check if fork support (ibv_fork_init) is
       enabled

SYNOPSIS         top

              #include <infiniband/verbs.h>

              enum ibv_fork_status {
                  IBV_FORK_DISABLED,
                  IBV_FORK_ENABLED,
                  IBV_FORK_UNNEEDED,
              };

              enum ibv_fork_status ibv_is_fork_initialized(void);

DESCRIPTION         top

       ibv_is_fork_initialized() checks whether libibverbs fork() support
       was enabled through the ibv_fork_init() verb.

RETURN VALUE         top

       ibv_is_fork_initialized() returns IBV_FORK_DISABLED if fork
       support is disabled, or IBV_FORK_ENABLED if enabled.
       IBV_FORK_UNNEEDED return value indicates that the kernel copies
       DMA pages on fork, hence a call to ibv_fork_init() is unneeded.

NOTES         top

       The IBV_FORK_UNNEEDED return value takes precedence over
       IBV_FORK_DISABLED and IBV_FORK_ENABLED.  If the kernel supports
       copy-on-fork for DMA pages then IBV_FORK_UNNEEDED will be returned
       regardless of whether ibv_fork_init() was called or not.

SEE ALSO         top

       fork(2), ibv_fork_init(3)

AUTHOR         top

       Gal Pressman ⟨galpress@amazon.com⟩

COLOPHON         top

       This page is part of the rdma-core (RDMA Core Userspace Libraries
       and Daemons) project.  Information about the project can be found
       at ⟨https://github.com/linux-rdma/rdma-core⟩.  If you have a bug
       report for this manual page, send it to
       linux-rdma@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2025-08-04.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there is
       a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

libibverbs                      2020-10-09          IBV_IS_...TIALIZED(3)

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