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1 files changed, 68 insertions, 0 deletions

diff --git a/sys/etc/propdpr.x b/sys/etc/propdpr.x
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+++ b/sys/etc/propdpr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<knet.h>
+include	<config.h>
+include	<syserr.h>
+
+# PROPDPR -- Open a detached process.  A detached process runs independently of
+# and asynchronous with the parent, with no direct communications (i.e., like
+# the IPC channels of connected subprocesses).  The bkgfile is prepared by the
+# parent and read by the detached process, telling the detached process what
+# to do.  There are no restrictions on the format or contents of the bkgfile
+# other than those placed by the implementor of the two processes (either a
+# text or binary file may be used).  Deletion of the bkgfile is however assumed
+# to signify that the bkg process has terminated.
+
+int procedure propdpr (process, bkgfile, bkgmsg)
+
+char	process[ARB]		# vfn of executable process file
+char	bkgfile[ARB]		# vfn of background file
+char	bkgmsg[ARB]		# control string for kernel
+
+bool	first_time
+int	jobcode, pr
+pointer	sp, process_osfn, bkgfile_osfn, pk_bkgmsg
+data	first_time /true/
+errchk	fmapfn, syserrs, malloc
+include	"prd.com"
+
+begin
+	call smark (sp)
+	call salloc (process_osfn, SZ_PATHNAME, TY_CHAR)
+	call salloc (bkgfile_osfn, SZ_PATHNAME, TY_CHAR)
+	call salloc (pk_bkgmsg,    SZ_LINE,     TY_CHAR)
+
+	# First time initialization of the job table.
+	if (first_time) {
+	    do pr = 1, MAX_BKGJOBS
+		pr_jobcode[pr] = NULL
+	    first_time = false
+	}
+
+	# Get job slot.
+	for (pr=1;  pr <= MAX_BKGJOBS;  pr=pr+1)
+	    if (pr_jobcode[pr] == NULL)
+		break
+	if (pr > MAX_BKGJOBS)
+	    call syserrs (SYS_PRBKGOVFL, process)
+
+	# Map file names.
+	call fmapfn (process, Memc[process_osfn], SZ_PATHNAME)
+	call fmapfn (bkgfile, Memc[bkgfile_osfn], SZ_PATHNAME)
+	call strpak (bkgmsg,  Memc[pk_bkgmsg],    SZ_LINE)
+
+	# Spawn or enqueue detached process.
+	call zopdpr (Memc[process_osfn], Memc[bkgfile_osfn], Memc[pk_bkgmsg],
+	    jobcode)
+	if (jobcode == ERR)
+	    call syserrs (SYS_PRBKGOPEN, process)
+
+	# Set up bkg job descriptor.
+	pr_jobcode[pr] = jobcode
+	pr_active[pr] = YES
+	call malloc (pr_bkgfile[pr], SZ_FNAME, TY_CHAR)
+	call strcpy (bkgfile, Memc[pr_bkgfile[pr]], SZ_FNAME)
+
+	call sfree (sp)
+	return (pr)
+end