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/*
* Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2009 Sandia National Laboratories. All rights reserved.
*
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include "opal/util/fd.h"
#include "opal/constants.h"
/*
* Simple loop over reading from a fd
*/
int opal_fd_read(int fd, int len, void *buffer)
{
int rc;
char *b = buffer;
while (len > 0) {
rc = read(fd, b, len);
if (rc < 0 && (EAGAIN == errno || EINTR == errno)) {
continue;
} else if (rc > 0) {
len -= rc;
b += rc;
} else if (0 == rc) {
return OPAL_ERR_TIMEOUT;
} else {
return OPAL_ERR_IN_ERRNO;
}
}
return OPAL_SUCCESS;
}
/*
* Simple loop over writing to an fd
*/
int opal_fd_write(int fd, int len, const void *buffer)
{
int rc;
const char *b = buffer;
while (len > 0) {
rc = write(fd, b, len);
if (rc < 0 && (EAGAIN == errno || EINTR == errno)) {
continue;
} else if (rc > 0) {
len -= rc;
b += rc;
} else {
return OPAL_ERR_IN_ERRNO;
}
}
return OPAL_SUCCESS;
}
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