SD_JOURNAL_SYSTEM man page on OpenMandriva

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SD_JOURNAL_OPEN(3)		sd_journal_open		    SD_JOURNAL_OPEN(3)

NAME
       sd_journal_open, sd_journal_open_directory, sd_journal_open_files,
       sd_journal_close, sd_journal, SD_JOURNAL_LOCAL_ONLY,
       SD_JOURNAL_RUNTIME_ONLY, SD_JOURNAL_SYSTEM, SD_JOURNAL_CURRENT_USER -
       Open the system journal for reading

SYNOPSIS
       #include <systemd/sd-journal.h>

       int sd_journal_open(sd_journal** ret, int flags);

       int sd_journal_open_directory(sd_journal** ret, const char* path,
				     int flags);

       int sd_journal_open_files(sd_journal** ret, const char** paths,
				 int flags);

       void sd_journal_close(sd_journal* j);

DESCRIPTION
       sd_journal_open() opens the log journal for reading. It will find all
       journal files automatically and interleave them automatically when
       reading. As first argument it takes a pointer to a sd_journal pointer,
       which on success will contain a journal context object. The second
       argument is a flags field, which may consist of the following flags
       ORed together: SD_JOURNAL_LOCAL_ONLY makes sure only journal files
       generated on the local machine will be opened.  SD_JOURNAL_RUNTIME_ONLY
       makes sure only volatile journal files will be opened, excluding those
       which are stored on persistent storage.	SD_JOURNAL_SYSTEM will cause
       journal files of system services and the kernel (in opposition to user
       session processes) to be opened.	 SD_JOURNAL_CURRENT_USER will cause
       journal files of the current user to be opened. If neither
       SD_JOURNAL_SYSTEM nor SD_JOURNAL_CURRENT_USER are specified, all
       journal file types will be opened.

       sd_journal_open_directory() is similar to sd_journal_open() but takes
       an absolute directory path as argument. All journal files in this
       directory will be opened and interleaved automatically. This call also
       takes a flags argument, but it must be passed as 0 as no flags are
       currently understood for this call.

       sd_journal_open_files() is similar to sd_journal_open() but takes a
       NULL-terminated list of file paths to open. All files will be opened
       and interleaved automatically. This call also takes a flags argument,
       but it must be passed as 0 as no flags are currently understood for
       this call. Please note that in the case of a live journal, this
       function is only useful for debugging, because individual journal files
       can be rotated at any moment, and the opening of specific files is
       inherently racy.

       sd_journal objects cannot be used in the child after a fork. Functions
       which take a journal object as an argument (sd_journal_next() and
       others) will return -ECHILD after a fork.

       sd_journal_close() will close the journal context allocated with
       sd_journal_open() or sd_journal_open_directory() and free its
       resources.

       When opening the journal only journal files accessible to the calling
       user will be opened. If journal files are not accessible to the caller,
       this will be silently ignored.

       See sd_journal_next(3) for an example of how to iterate through the
       journal after opening it with sd_journal_open().

       A journal context object returned by sd_journal_open() references a
       specific journal entry as current entry, similar to a file seek index
       in a classic file system file, but without absolute positions. It may
       be altered with sd_journal_next(3) and sd_journal_seek_head(3) and
       related calls. The current entry position may be exported in cursor
       strings, as accessible via sd_journal_get_cursor(3). Cursor strings may
       be used to globally identify a specific journal entry in a stable way
       and then later to seek to it (or if the specific entry is not available
       locally, to its closest entry in time) sd_journal_seek_cursor(3).

       Notification of journal changes is available via sd_journal_get_fd()
       and related calls.

RETURN VALUE
       The sd_journal_open(), sd_journal_open_directory(), and
       sd_journal_open_files() calls return 0 on success or a negative
       errno-style error code.	sd_journal_close() returns nothing.

NOTES
       The sd_journal_open(), sd_journal_open_directory() and
       sd_journal_close() interfaces are available as a shared library, which
       can be compiled and linked to with the libsystemd-journal pkg-config(1)
       file.

HISTORY
       sd_journal_open(), sd_journal_close(), SD_JOURNAL_LOCAL_ONLY,
       SD_JOURNAL_RUNTIME_ONLY, SD_JOURNAL_SYSTEM_ONLY were added in
       systemd-38.

       sd_journal_open_directory() was added in systemd-187.

       SD_JOURNAL_SYSTEM, SD_JOURNAL_CURRENT_USER, and sd_journal_open_files()
       were added in systemd-205.  SD_JOURNAL_SYSTEM_ONLY was deprecated.

SEE ALSO
       systemd(1), sd-journal(3), sd_journal_next(3), sd_journal_get_data(3)

systemd 208						    SD_JOURNAL_OPEN(3)
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