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  * SPDX-License-Identifier: LGPL-2.1-only
   8  *
   9  */
  10
  11 #include <unistd.h>
  12 #include <common/macros.h>
  13
  14 #ifdef __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 /*
  19  * lttng_read and lttng_write take care of EINTR and partial read/write.
  20  * Upon success, they return the "count" received as parameter.
  21  * They can return a negative value if an error occurs.
  22  * If a value lower than the requested "count" is returned, it means an
  23  * error occurred.
  24  * The error can be checked by querying errno.
  25  */
  26 ssize_t lttng_read(int fd, void *buf, size_t count);
  27 ssize_t lttng_write(int fd, const void *buf, size_t count);
  28
  29 #ifdef __cplusplus
  30 }
  31 #endif
  32
  33 #endif /* LTTNG_COMMON_READWRITE_H */