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06ce9b4e42
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
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_FILE_H
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#define _LVM_FILE_H
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struct custom_fds {
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int out;
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int err;
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int report;
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};
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/*
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* Create a temporary filename, and opens a descriptor to the file.
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*/
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int create_temp_name(const char *dir, char *buffer, size_t len, int *fd,
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unsigned *seed);
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/*
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* NFS-safe rename of a temporary file to a common name, designed
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* to avoid race conditions and not overwrite the destination if
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* it exists.
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*/
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int lvm_rename(const char *old, const char *new);
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/*
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* Return 1 if path exists else return 0
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*/
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int path_exists(const char *path);
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int dir_exists(const char *path);
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/*
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* Return 1 if dir is empty
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*/
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int is_empty_dir(const char *dir);
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/* Sync directory changes */
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void sync_dir(const char *file);
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/* fcntl locking wrappers */
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int fcntl_lock_file(const char *file, short lock_type, int warn_if_read_only);
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void fcntl_unlock_file(int lockfd);
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#define is_same_inode(buf1, buf2) \
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((buf1).st_ino == (buf2).st_ino && \
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(buf1).st_dev == (buf2).st_dev)
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#define is_valid_fd(fd) (!(fcntl(fd, F_GETFD) == -1 && errno == EBADF))
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/*
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* Close the specified stream, taking care to detect and diagnose any write
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* error. If there is an error, use the supplied file name in a diagnostic
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* that is reported via log_error or log_sys_error, as appropriate.
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* Use this function to close a stream when you've written data to it via
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* unchecked fprintf, fputc, etc. calls. Return 0 on success, EOF on failure.
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*/
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int lvm_fclose(FILE *fp, const char *filename);
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/*
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* Convert stat->st_ctim status of last change in nanoseconds
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* uses st_ctime when not available.
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*/
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void lvm_stat_ctim(struct timespec *ts, const struct stat *buf);
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/* Inspired by <sys/time.h> timercmp() macro for timeval */
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#define timespeccmp(tsp, usp, cmp)\
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(((tsp)->tv_sec == (usp)->tv_sec) ?\
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((tsp)->tv_nsec cmp (usp)->tv_nsec) :\
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((tsp)->tv_sec cmp (usp)->tv_sec))
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#endif
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