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Where is FreeBSD libc's _write defined?


Where is FreeBSD libc's _write defined?

By : Luan Yuen
Date : November 17 2020, 11:52 AM
it fixes the issue Keep in mind that _write is a /very/ complicated syscall. Since it functions on a file handle which may be file on any type of filesystem or even a network socket, it basically forks off to places all over the kernel.
The wiki page you link to is the right place to start to understand FreeBSD syscalls. write is probably not the best syscall to use to understand them, if that's what you're trying to do.
code :
/usr/src/sys/kern/sys_generic.c:358

#ifndef _SYS_SYSPROTO_H_
struct write_args {
    int fd;
    const void *buf;
    size_t  nbyte;
};
#endif
int
sys_write(td, uap)
    struct thread *td;
    struct write_args *uap;
{
    struct uio auio;
    struct iovec aiov;
    int error;

    if (uap->nbyte > IOSIZE_MAX)
        return (EINVAL);
    aiov.iov_base = (void *)(uintptr_t)uap->buf;
    aiov.iov_len = uap->nbyte;
    auio.uio_iov = &aiov;
    auio.uio_iovcnt = 1;
    auio.uio_resid = uap->nbyte;
    auio.uio_segflg = UIO_USERSPACE;
    error = kern_writev(td, uap->fd, &auio);
    return(error);
}


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Is _write in io.h a blocking call?

Is _write in io.h a blocking call?


By : Lotus
Date : March 29 2020, 07:55 AM
With these it helps If you want to do async I/O on Windows then either use the Win32 APIs directly (look at docs for WriteFileEx/ReadFileEx, which contain pointers to general background on async I/O vs sync) or consider boost::asio.
Can you _close(), _read(), and _write() a socket on windows?

Can you _close(), _read(), and _write() a socket on windows?


By : jamestha3d
Date : March 29 2020, 07:55 AM
may help you . The short answer is no. Sockets handles on Windows are not file handles as they are on Unix. There's special support such that the low level Win32 APIs, ReadFile and WriteFile, can work with a socket handle. But that's likely where it ends.
With regards to _open_osfhandle, yes, that will possibly work in a very limited sense, but there's good reasons why you shouldn't do this. Most of the following I inferred just by browsing the sources of open, read,write, close, and open_osfhandle in the CRT sources (that comes with Visual Studio).
How to rebuild FreeBSD-native LLVM/Clang on FreeBSD, or how to get the source code?

How to rebuild FreeBSD-native LLVM/Clang on FreeBSD, or how to get the source code?


By : user3076155
Date : March 29 2020, 07:55 AM
I hope this helps you . New versions of Clang and LLVM are in ports/packages (eg. "pkg install clang35"). If you want to easily rebuild it with your changes, do "portsnap fetch update" to update your ports, "cd /usr/ports/lang/clang35", "make configure", then apply your changes to sources in /usr/ports/lang/clang35/work/ directory, and then do "make all install".
To rebuild LLVM version in the FreeBSD source tree, use the Makefiles in /usr/src/usr.bin/clang.
FreeBSD: Implicit declaration of getpagesize with _POSIX_C_SOURCE=200809L defined.

FreeBSD: Implicit declaration of getpagesize with _POSIX_C_SOURCE=200809L defined.


By : Prashant
Date : March 29 2020, 07:55 AM
should help you out (1) The _POSIX_C_SOURCE is a wrong define. You need the _XOPEN_SOURCE. For example:
code :
cc -D_XOPEN_SOURCE=700 test.c 
cc -D_XOPEN_SOURCE=600 test.c 
SimplerXMLGenerator has no attribute '_write'

SimplerXMLGenerator has no attribute '_write'


By : Harpriya Chahal
Date : March 29 2020, 07:55 AM
will be helpful for those in need _write comes from the python stdlib xml.sax.saxutils.XMLGenerator. Something must be overriding the built-in xml library. IIRC, PyXML used to do that.
PS: Not entirely related but pelican uses standalone version of feedgenerator
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