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44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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read.cpp
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Reads from a file descriptor.
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*******************************************************************************/
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#include <sys/syscall.h>
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#include <errno.h>
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#include <unistd.h>
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DEFN_SYSCALL3(ssize_t, SysRead, SYSCALL_READ, int, void*, size_t);
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extern "C" ssize_t read(int fd, void* buf, size_t count)
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{
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retry:
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ssize_t result = SysRead(fd, buf, count);
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if ( result < 0 && errno == EAGAIN ) { goto retry; }
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return result;
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}
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DEFN_SYSCALL4(ssize_t, sys_pread, SYSCALL_PREAD, int, void*, size_t, off_t);
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extern "C" ssize_t pread(int fd, void* buf, size_t count, off_t offset)
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{
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return sys_pread(fd, buf, count, offset);
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}
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