gctf2023/pwn/flipper/dist/userspace/libc/src/write.c
2023-11-24 13:11:34 -05:00

45 lines
1.8 KiB
C

// Projectname: SWEB
// Simple operating system for educational purposes
//
// Copyright (C) 2005 Andreas Niederl
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include "unistd.h"
#include "sys/syscall.h"
#include "../../../common/include/kernel/syscall-definitions.h"
/**
* Writes to a file descriptor.
* Up to count bytes from the provided buffer are written to the given file.
*
* If the given file is capable of seeking, the write will start at the file
* position associated with the descriptor. This offset is incremented by
* the number of bytes actually written.
*
* @param file_descriptor file descriptor referencing the file to write
* @param buffer the buffer where the write data will be placed
* @param count the number of bytes to write
* @param offset the absolute offset where the write operation starts
* @return the number of bytes written on success, 0 if count is zero or\
nothing was written, and -1 if an error occured
*
*/
ssize_t write(int file_descriptor, const void *buffer, size_t count)
{
return __syscall(sc_write, file_descriptor, (long) buffer, count, 0x00,
0x00);
}