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64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
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/* Reentrant versions of read system call. */
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#include <reent.h>
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#include <unistd.h>
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#include <_syslist.h>
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/* Some targets provides their own versions of this functions. Those
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targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */
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#ifdef _REENT_ONLY
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#ifndef REENTRANT_SYSCALLS_PROVIDED
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#define REENTRANT_SYSCALLS_PROVIDED
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#endif
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#endif
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#ifndef REENTRANT_SYSCALLS_PROVIDED
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/* We use the errno variable used by the system dependent layer. */
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#undef errno
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extern int errno;
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/*
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FUNCTION
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<<_read_r>>---Reentrant version of read
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INDEX
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_read_r
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ANSI_SYNOPSIS
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#include <reent.h>
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_ssize_t _read_r(struct _reent *<[ptr]>,
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int <[fd]>, void *<[buf]>, size_t <[cnt]>);
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TRAD_SYNOPSIS
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#include <reent.h>
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_ssize_t _read_r(<[ptr]>, <[fd]>, <[buf]>, <[cnt]>)
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struct _reent *<[ptr]>;
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int <[fd]>;
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char *<[buf]>;
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size_t <[cnt]>;
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DESCRIPTION
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This is a reentrant version of <<read>>. It
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takes a pointer to the global data block, which holds
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<<errno>>.
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*/
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_ssize_t
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_DEFUN (_read_r, (ptr, fd, buf, cnt),
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struct _reent *ptr _AND
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int fd _AND
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_PTR buf _AND
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size_t cnt)
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{
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_ssize_t ret;
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errno = 0;
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if ((ret = (_ssize_t)_read (fd, buf, cnt)) == -1 && errno != 0)
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ptr->_errno = errno;
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return ret;
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}
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#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
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