Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

Closing #7056:
* inherit umask of calling process to images loaded via exec...()

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40071 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changed the _kern_exec() and _kern_load_image() syscalls. They expect
a flattened argument/environment buffer now. This simplifies the work
for the kernel a bit, since it can just copy the buffer and check
whether it looks OK instead of messing around with individual strings.
The runtime loader also gets a flattened array.
* Set the maximum size of the arguments/environment buffer to 128 KB.
When more arguments are passed, we fail with a proper error code
(instead of just truncating the arguments as before).
* On exec*() the first argument was silently replaced by the given path
name, which is not correct.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26119 a95241bf-73f2-0310-859d-f6bbb57e9c96

execvp() also needs to verify that an entry it found in the path is a
file. It would try to execute directories before (#1963).



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24599 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fixed my previous execvp() endless loop fix, which would always cause
an infinite loop.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24569 a95241bf-73f2-0310-859d-f6bbb57e9c96

execvp() was looping endlessly if PATH contained empty entries.
Reorganized the loop so that this won't happen anymore.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24568 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented execvp() for real.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24560 a95241bf-73f2-0310-859d-f6bbb57e9c96

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

Closing #7056:
* inherit umask of calling process to images loaded via exec...()

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40071 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changed the _kern_exec() and _kern_load_image() syscalls. They expect
a flattened argument/environment buffer now. This simplifies the work
for the kernel a bit, since it can just copy the buffer and check
whether it looks OK instead of messing around with individual strings.
The runtime loader also gets a flattened array.
* Set the maximum size of the arguments/environment buffer to 128 KB.
When more arguments are passed, we fail with a proper error code
(instead of just truncating the arguments as before).
* On exec*() the first argument was silently replaced by the given path
name, which is not correct.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26119 a95241bf-73f2-0310-859d-f6bbb57e9c96

execvp() also needs to verify that an entry it found in the path is a
file. It would try to execute directories before (#1963).



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24599 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fixed my previous execvp() endless loop fix, which would always cause
an infinite loop.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24569 a95241bf-73f2-0310-859d-f6bbb57e9c96

execvp() was looping endlessly if PATH contained empty entries.
Reorganized the loop so that this won't happen anymore.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24568 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented execvp() for real.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24560 a95241bf-73f2-0310-859d-f6bbb57e9c96