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-.\" -*- nroff -*-
-.\"
-.TH IBV_FORK_INIT 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
-.SH "NAME"
-ibv_fork_init \- initialize libibverbs to support fork()
-.SH "SYNOPSIS"
-.nf
-.B #include <infiniband/verbs.h>
-.sp
-.BI "int ibv_fork_init(void);
-.fi
-.SH "DESCRIPTION"
-.B ibv_fork_init()
-initializes libibverbs's data structures to handle
-.B fork()
-function calls correctly and avoid data corruption, whether
-.B fork()
-is called explicitly or implicitly (such as in
-.B system()\fR).
-.PP
-It is not necessary to use this function if all parent process threads
-are always blocked until all child processes end or change address
-spaces via an
-.B exec()
-operation.
-.SH "RETURN VALUE"
-.B ibv_fork_init()
-returns 0 on success, or the value of errno on failure (which indicates the failure reason).
-.SH "NOTES"
-.B ibv_fork_init()
-works on Linux kernels supporting the
-.BR MADV_DONTFORK
-flag for
-.B madvise()
-(2.6.17 and higher).
-.PP
-Setting the environment variable
-.BR RDMAV_FORK_SAFE
-or
-.BR IBV_FORK_SAFE
-has the same effect as calling
-.B ibv_fork_init()\fR.
-.PP
-Setting the environment variable
-.BR 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.
-.PP
-Calling
-.B 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.
-.PP
-Setting
-.BR RDMAV_HUGEPAGES_SAFE
-adds further overhead to all memory registrations.
-.SH "SEE ALSO"
-.BR fork (2),
-.BR wait (2),
-.BR system (3),
-.BR exec (3),
-.BR ibv_get_device_list (3)
-.SH "AUTHORS"
-.TP
-Dotan Barak <dotanba@gmail.com>