/*
 * Copyright (c) 2008-2014 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2009      Sandia National Laboratories. All rights reserved.
 * Copyright (c) 2014-2020 Intel, Inc.  All rights reserved.
 * Copyright (c) 2015      Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */

#include "src/include/pmix_config.h"

#include "include/pmix_common.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#include "src/util/error.h"
#include "src/util/fd.h"


/*
 * Simple loop over reading from a fd
 */
pmix_status_t pmix_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 PMIX_ERR_TIMEOUT;
        } else {
            return PMIX_ERR_IN_ERRNO;
        }
    }
    return PMIX_SUCCESS;
}


/*
 * Simple loop over writing to an fd
 */
pmix_status_t pmix_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 PMIX_ERR_IN_ERRNO;
        }
    }

    return PMIX_SUCCESS;
}


pmix_status_t pmix_fd_set_cloexec(int fd)
{
#ifdef FD_CLOEXEC
    int flags;

    /* Stevens says that we should get the fd's flags before we set
       them.  So say we all. */
    flags = fcntl(fd, F_GETFD, 0);
    if (-1 == flags) {
        return PMIX_ERR_IN_ERRNO;
    }

    if (fcntl(fd, F_SETFD, FD_CLOEXEC | flags) == -1) {
        return PMIX_ERR_IN_ERRNO;
    }
#endif

    return PMIX_SUCCESS;
}


bool pmix_fd_is_regular(int fd)
{
    struct stat buf;
    /* coverity[toctou] */
    if (fstat(fd, &buf)) {
        return false;
    }
    return S_ISREG(buf.st_mode);
}

bool pmix_fd_is_chardev(int fd)
{
    struct stat buf;
    /* coverity[toctou] */
    if (fstat(fd, &buf)) {
        return false;
    }
    return S_ISCHR(buf.st_mode);
}

bool pmix_fd_is_blkdev(int fd)
{
    struct stat buf;
    /* coverity[toctou] */
    if (fstat(fd, &buf)) {
        return false;
    }
    return S_ISBLK(buf.st_mode);
}
