Fix markup, grammar and spelling.
This commit is contained in:
Ruslan Ermilov
parent
370366007b
commit
6b84cd5819
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=152579
@ -32,13 +32,13 @@
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.Nm pidfile_write ,
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.Nm pidfile_close ,
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.Nm pidfile_remove
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.Nd library for PID files handling
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.Nd "library for PID files handling"
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In sys/param.h
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.In libutil.h
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.Ft struct pidfh *
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.Ft "struct pidfh *"
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.Fn pidfile_open "const char *path" "mode_t mode" "pid_t *pidptr"
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.Ft int
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.Fn pidfile_write "struct pidfh *pfh"
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@ -48,54 +48,63 @@
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.Fn pidfile_remove "struct pidfh *pfh"
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.Sh DESCRIPTION
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The
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.Nm libpidfile
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library provides functions for daemons to handle file with PID.
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.Nm pidfile
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family of functions allows daemons to handle PID files.
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It uses
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.Xr flock 2
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to lock pidfile and detect already running daemons.
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to lock a pidfile and detect already running daemons.
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.Pp
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The
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.Fn pidfile_open
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function opens (or creates) a file specified by
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function opens (or creates) a file specified by the
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.Fa path
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argument and locks it with
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argument and locks it with the
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.Xr flock 2
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syscall.
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If file can not be locked, PID of already running daemon is returned in
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system call.
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If a file can not be locked, a PID of an already running daemon is returned in
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the
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.Fa pidptr
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argument (if it is not NULL).
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The function doesn't write process' PID into the file here, so it can be
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used before fork()ing and exit with proper error message when needed.
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If
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argument (if it is not
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.Dv NULL ) .
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The function does not write process' PID into the file here, so it can be
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used before
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.Fn fork Ns ing
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and exit with a proper error message when needed.
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If the
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.Fa path
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argument is NULL,
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.Pa /var/run/<progname>.pid
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argument is
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.Dv NULL ,
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.Pa /var/run/ Ns Ao Va progname Ac Ns Pa .pid
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file will be used.
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.Pp
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The
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.Fn pidfile_write
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function write process' PID into previously opened file.
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function writes process' PID into a previously opened file.
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.Pp
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The
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.Fn pidfile_close
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function closes pidfile.
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It should be used after daemon fork()s to start a child process.
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function closes a pidfile.
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It should be used after daemon
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.Fn fork Ns s
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to start a child process.
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.Pp
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The
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.Fn pidfile_remove
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function closes and removes pidfile.
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function closes and removes a pidfile.
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.Sh RETURN VALUES
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The
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.Fn pidfile_open
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function return a valid pointer to a pidfh structure on success or
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function returns a valid pointer to a
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.Vt pidfh
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structure on success, or
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.Dv NULL
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if an error occurs.
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If an error does occur,
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If an error occurs,
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.Va errno
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will be set.
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.Rv -std pidfile_write pidfile_close pidfile_remove
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.Sh EXAMPLES
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The following example shows in which order those functions should be used.
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The following example shows in which order these functions should be used.
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.Bd -literal
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struct pidfh *pfh;
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pid_t otherpid, childpid;
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@ -142,7 +151,7 @@ The
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EEXIST
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Some process already holds the lock on the given pidfile, which means,
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Some process already holds the lock on the given pidfile, meaning that a
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daemon is already running.
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.It Bq Er ENAMETOOLONG
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Specified pidfile's name is too long.
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@ -158,15 +167,16 @@ function may also fail and set
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for any errors specified for the
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.Xr fstat 2 ,
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.Xr open 2 ,
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and
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.Xr read 2
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routines.
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calls.
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.Pp
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The
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.Fn pidfile_write
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EDOOFUS
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Inproper function use.
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Improper function use.
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Probably called before
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.Fn pidfile_open .
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.El
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@ -178,24 +188,26 @@ function may also fail and set
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for any errors specified for the
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.Xr fstat 2 ,
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.Xr ftruncate 2 ,
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and
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.Xr write 2
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routines.
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calls.
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.Pp
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The
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.Fn pidfile_close
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function may fail and set
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.Va errno
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for any errors specified for the
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.Xr close 2 ,
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.Xr close 2
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and
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.Xr fstat 2
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routines.
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calls.
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.Pp
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The
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.Fn pidfile_remove
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EDOOFUS
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Inproper function use.
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Improper function use.
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Probably called not from the process which made
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.Fn pidfile_write .
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.El
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@ -209,9 +221,9 @@ for any errors specified for the
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.Xr flock 2 ,
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.Xr fstat 2 ,
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.Xr write 2 ,
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and
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.Xr unlink 2
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routines.
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.Pp
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calls.
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.Sh SEE ALSO
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.Xr flock 2 ,
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.Xr open 2 ,
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@ -219,7 +231,7 @@ routines.
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.Sh AUTHORS
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.An -nosplit
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The
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.Xr pidfile 3
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.Nm pidfile
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functionality is based on ideas from
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.An John-Mark Gurney Aq jmg@FreeBSD.org .
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.Pp
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