diff options
Diffstat (limited to 'lib/libc/sys/rfork.2')
| -rw-r--r-- | lib/libc/sys/rfork.2 | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/lib/libc/sys/rfork.2 b/lib/libc/sys/rfork.2 index 7f160ec..d6c69dc 100644 --- a/lib/libc/sys/rfork.2 +++ b/lib/libc/sys/rfork.2 @@ -59,7 +59,8 @@ If set, the kernel will force sharing of the entire address space, typically by sharing the hardware page table directly. The child will thus inherit and share all the segments the parent process owns, -whether they are normally shareable or not. The stack segment is +whether they are normally shareable or not. +The stack segment is not split (both the parent and child return on the same stack) and thus .Fn rfork with the RFMEM flag may not generally be called directly from high level @@ -67,7 +68,8 @@ languages including C. May be set only with .Dv RFPROC . A helper function is provided to assist with this problem and will cause -the new process to run on the provided stack. See +the new process to run on the provided stack. +See .Xr rfork_thread 3 for information. .It Dv RFSIGSHARE @@ -75,7 +77,8 @@ If set, the kernel will force sharing the sigacts structure between the child and the parent. .It Dv RFLINUXTHPN If set, the kernel will return SIGUSR1 instead of SIGCHILD upon thread -exit for the child. This is intended to mimic certain Linux clone behaviour. +exit for the child. +This is intended to mimic certain Linux clone behaviour. .El .Pp File descriptors in a shared file descriptor table are kept @@ -110,7 +113,8 @@ Upon successful completion, .Fn rfork returns a value of 0 to the child process and returns the process ID of the child -process to the parent process. Otherwise, a value of -1 is returned +process to the parent process. +Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable .Va errno @@ -166,7 +170,8 @@ does not yet implement a native .Fn clone library call, and the current pthreads implementation does not use .Fn rfork -with RFMEM. A native port of the linux threads library, +with RFMEM. +A native port of the linux threads library, .Pa /usr/ports/devel/linuxthreads , contains a working .Fn clone |
