src/common/readwrite.h

   1 #ifndef LTTNG_COMMON_READWRITE_H
   2 #define LTTNG_COMMON_READWRITE_H
   3
   4 /*
   5  * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * This library is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU Lesser General Public License, version 2.1 only,
   9  * as published by the Free Software Foundation.
  10  *
  11  * This library is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this library; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <unistd.h>
  22 #include <common/macros.h>
  23
  24 /*
  25  * lttng_read and lttng_write take care of EINTR and partial read/write.
  26  * Upon success, they return the "count" received as parameter.
  27  * They can return a negative value if an error occurs.
  28  * If a value lower than the requested "count" is returned, it means an
  29  * error occurred.
  30  * The error can be checked by querying errno.
  31  */
  32 LTTNG_HIDDEN
  33 ssize_t lttng_read(int fd, void *buf, size_t count);
  34 LTTNG_HIDDEN
  35 ssize_t lttng_write(int fd, const void *buf, size_t count);
  36
  37 #endif /* LTTNG_COMMON_READWRITE_H */