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lvm2/lib/misc/lvm-file.h
Peter Rajnoha 06ce9b4e42 log: separate output and make it possible to use given FDs
Currently, the output is separated in 3 parts and each part can go into
a separate and user-defined file descriptor:

  - common output (stdout by default, customizable by LVM_OUT_FD environment variable)
  - error output (stderr by default, customizable by LVM_ERR_FD environment variable)
  - report output (stdout by default, customizable by LVM_REPORT_FD environment variable)

For example, each type of output goes to different output file:

  [0] fedora/~ # export LVM_REPORT_FD=3

  [0] fedora/~ # lvs fedora vg/abc 1>out 2>err 3>report

  [0] fedora/~ # cat out

  [0] fedora/~ # cat err
    Volume group "vg" not found
    Cannot process volume group vg

  [0] fedora/~ # cat report
    LV   VG     Attr       LSize   Layout     Role       CTime
    root fedora -wi-ao----  19.00g linear     public     Wed May 27 2015 08:09:21
    swap fedora -wi-ao---- 500.00m linear     public     Wed May 27 2015 08:09:21

Another example in LVM shell where the report goes to "report" file:

  [0] fedora/~ # export LVM_REPORT_FD=3
  [0] fedora/~ # lvm 3>report

  (in lvm shell)
  lvm> vgs

  (content of "report" file)
  [1] fedora/~ # cat report
    VG     #PV #LV #SN Attr   VSize  VFree
    fedora   1   2   0 wz--n- 19.49g    0

  (in lvm shell)
  lvm> lvs

  (content of "report" file)
  [1] fedora/~ # cat report
    VG     #PV #LV #SN Attr   VSize  VFree
    fedora   1   2   0 wz--n- 19.49g    0
    LV   VG     Attr       LSize   Layout     Role       CTime
    root fedora -wi-ao----  19.00g linear     public     Wed May 27 2015 08:09:21
    swap fedora -wi-ao---- 500.00m linear     public     Wed May 27 2015 08:09:21
2016-08-09 18:24:45 +02:00

83 lines
2.4 KiB
C

/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LVM_FILE_H
#define _LVM_FILE_H
struct custom_fds {
int out;
int err;
int report;
};
/*
* Create a temporary filename, and opens a descriptor to the file.
*/
int create_temp_name(const char *dir, char *buffer, size_t len, int *fd,
unsigned *seed);
/*
* NFS-safe rename of a temporary file to a common name, designed
* to avoid race conditions and not overwrite the destination if
* it exists.
*/
int lvm_rename(const char *old, const char *new);
/*
* Return 1 if path exists else return 0
*/
int path_exists(const char *path);
int dir_exists(const char *path);
/*
* Return 1 if dir is empty
*/
int is_empty_dir(const char *dir);
/* Sync directory changes */
void sync_dir(const char *file);
/* fcntl locking wrappers */
int fcntl_lock_file(const char *file, short lock_type, int warn_if_read_only);
void fcntl_unlock_file(int lockfd);
#define is_same_inode(buf1, buf2) \
((buf1).st_ino == (buf2).st_ino && \
(buf1).st_dev == (buf2).st_dev)
#define is_valid_fd(fd) (!(fcntl(fd, F_GETFD) == -1 && errno == EBADF))
/*
* Close the specified stream, taking care to detect and diagnose any write
* error. If there is an error, use the supplied file name in a diagnostic
* that is reported via log_error or log_sys_error, as appropriate.
* Use this function to close a stream when you've written data to it via
* unchecked fprintf, fputc, etc. calls. Return 0 on success, EOF on failure.
*/
int lvm_fclose(FILE *fp, const char *filename);
/*
* Convert stat->st_ctim status of last change in nanoseconds
* uses st_ctime when not available.
*/
void lvm_stat_ctim(struct timespec *ts, const struct stat *buf);
/* Inspired by <sys/time.h> timercmp() macro for timeval */
#define timespeccmp(tsp, usp, cmp)\
(((tsp)->tv_sec == (usp)->tv_sec) ?\
((tsp)->tv_nsec cmp (usp)->tv_nsec) :\
((tsp)->tv_sec cmp (usp)->tv_sec))
#endif