From ec92cd45ea0f244f00f8acb68fa188d5a32ad6ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani.haverinen@gmail.com>
Date: Wed, 11 Jul 2018 15:06:55 +0000
Subject: [PATCH] First commit

---
 .gitignore       |  3 +++
 Makefile         | 31 +++++++++++++++++++++++++++++++
 UNLICENSE        | 24 ++++++++++++++++++++++++
 pidfilewrapper.1 | 27 +++++++++++++++++++++++++++
 pidfilewrapper.c | 40 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 125 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 UNLICENSE
 create mode 100644 pidfilewrapper.1
 create mode 100644 pidfilewrapper.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7f5acaa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.swp
+*.o
+pidfilewrapper
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a926566
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,31 @@
+DESTDIR ?=
+PREFIX ?= /usr/local
+EXEC_PREFIX ?= $(PREFIX)
+BINDIR ?= $(DESTDIR)$(EXEC_PREFIX)/bin
+DATAROOTDIR ?= $(PREFIX)/share
+MANDIR ?= $(DATAROOTDIR)/man
+
+CFLAGS += -std=c11 -Os -g -Wall -Wextra -pedantic
+CPPFLAGS +=
+LDFLAGS +=
+
+all: pidfilewrapper
+
+pidfilewrapper: pidfilewrapper.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $<
+
+.PHONY: all install uninstall clean distclean
+
+install: all
+	mkdir -p $(BINDIR)
+	install pidfilewrapper $(BINDIR)
+	mkdir -p $(DESTDIR)$(MANDIR)/man1
+	cp pidfilewrapper.1 $(DESTDIR)$(MANDIR)/man1/pidfilewrapper.1
+
+uninstall:
+	rm -f $(BINDIR)/pidfilewrapper $(DESTDIR)$(MANDIR)/man1/pidfilewrapper.1
+
+clean:
+	rm -f pidfilewrapper
+
+distclean: clean
diff --git a/UNLICENSE b/UNLICENSE
new file mode 100644
index 0000000..69843e4
--- /dev/null
+++ b/UNLICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to [http://unlicense.org]
diff --git a/pidfilewrapper.1 b/pidfilewrapper.1
new file mode 100644
index 0000000..4a99798
--- /dev/null
+++ b/pidfilewrapper.1
@@ -0,0 +1,27 @@
+.Dd Jul 11, 2018
+.Dt pidfilewrapper 1
+.Os
+.Sh NAME
+.Nm pidfilewrapper
+.Nd create PID files for a simple daemon
+.Sh SYNOPSIS
+.Nm
+.Ar pidfile
+.Ar command
+.Op Ar arguments
+.Sh DESCRIPTION
+.Nm
+creates a PID file with specified filename and then executes the given command.
+It is intended for simple daemons that do not
+.Xr fork 2
+and then exit the initial process.
+.Pp
+.Nm
+executes the given command as the same process.
+.Sh EXIT STATUS
+.Nm
+will exit with status 1 if it fails to create a PID file or execute the given
+command. If it is succesful, exit status will be that of the given command.
+.Sh AUTHORS
+.Nm
+has been written by nortti.
diff --git a/pidfilewrapper.c b/pidfilewrapper.c
new file mode 100644
index 0000000..9bbaa41
--- /dev/null
+++ b/pidfilewrapper.c
@@ -0,0 +1,40 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdint.h>
+
+int main(int argc, char **argv) {
+	if(argc < 3) {
+		fprintf(stderr, "Usage: %s pidfile command [arguments]\n", argv[0]);
+		return 1;
+	}
+
+	const char *pidfilename = argv[1];
+	FILE *pidfile = fopen(pidfilename, "w");
+	if(pidfile == NULL) {
+		perror("fopen (opening pidfile)");
+		return 1;
+	}
+
+	pid_t own_pid = getpid();
+	
+	if(fprintf(pidfile, "%ji\n", (intmax_t) own_pid) < 0) {
+		perror("fprintf (printing pid)");
+		fclose(pidfile);
+		return 1;
+	}
+
+	if(fclose(pidfile) != 0) {
+		perror("fclose (pidfile)");
+		return 1;
+	}
+
+	char **daemon_argv = &argv[2];
+	const char *daemon_command = daemon_argv[0];
+
+	execvp(daemon_command, daemon_argv);
+
+	perror("execvp");
+	return 1;
+}