ibv_fork_init - initialize libibverbs to support fork()
#include <infiniband/verbs.h> int ibv_fork_init(void);
Libibverbs Programmer's Manual IBV_FORK_INIT(3) NAME ibv_fork_init - initialize libibverbs to support fork() SYNOPSIS #include <infiniband/verbs.h> int ibv_fork_init(void); DESCRIPTION ibv_fork_init() initializes libibverbs's data structures to handle fork() function calls correctly and avoid data corruption, whether fork() is called explicitly or implicitly (such as in system()). It is not necessary to use this function if all parent process threads are always blocked until all child processes end or change address spa- ces via an exec() operation. RETURN VALUE ibv_fork_init() returns 0 on success, or the value of errno on failure (which indicates the failure reason). ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+-----------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+-----------------------+ |Availability | network/open-fabrics | +---------------+-----------------------+ |Stability | Pass-through volatile | +---------------+-----------------------+ NOTES ibv_fork_init() works on Linux kernels supporting the MADV_DONTFORK flag for madvise() (2.6.17 and higher). Setting the environment variable RDMAV_FORK_SAFE or IBV_FORK_SAFE has the same effect as calling ibv_fork_init(). Setting the environment variable RDMAV_HUGEPAGES_SAFE tells the library to check the underlying page size used by the kernel for memory regions. This is required if an application uses huge pages either directly or indirectly via a library such as libhugetlbfs. Calling ibv_fork_init() will reduce performance due to an extra system call for every memory registration, and the additional memory allocated to track memory regions. The precise performance impact depends on the workload and usually will not be significant. Setting RDMAV_HUGEPAGES_SAFE adds further overhead to all memory regis- trations. Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from ['https://www.openfabrics.org/down- loads/ibutils/ibutils-1.5.7-0.2.gbd7e502.tar.gz', 'https://www.openfab- rics.org/downloads/libibverbs/libibverbs-1.1.8.tar.gz', 'https://www.openfabrics.org/downloads/libmlx4/libmlx4-1.0.6.tar.gz', 'https://www.openfabrics.org/downloads/libsdp/lib- sdp-1.1.108-0.15.gd7fdb72.tar.gz', 'https://www.openfabrics.org/down- loads/management/infiniband-diags-1.6.5.tar.gz', 'https://www.openfab- rics.org/downloads/management/libibmad-1.3.12.tar.gz', 'https://www.openfabrics.org/downloads/management/libibu- mad-1.3.10.2.tar.gz', 'https://www.openfabrics.org/downloads/manage- ment/opensm-3.3.19.tar.gz', 'https://www.openfabrics.org/down- loads/perftest/perftest-1.3.0-0.42.gf350d3d.tar.gz', 'https://www.open- fabrics.org/downloads/qperf/qperf-0.4.9.tar.gz', 'https://www.openfab- rics.org/downloads/rdmacm/librdmacm-1.0.21.tar.gz', 'https://www.open- fabrics.org/downloads/rds-tools/rds-tools-2.0.4.tar.gz']. Further information about this software can be found on the open source community website at http://www.openfabrics.org/. SEE ALSO fork(2), wait(2), system(3), exec(3), ibv_get_device_list(3) AUTHORS Dotan Barak <dotanba@gmail.com> libibverbs 2006-10-31 IBV_FORK_INIT(3)