[yocto] [PATCH 2/3] [meta-ivi] portmap: Write portmap.pid file at startup

[Shakeel, Muhammad]

From: Muhammad Shakeel <muhammad_shakeel at mentor.com>

Portmap systemd service is expecting this file to be present and
without this patch portmap service will fail, with timeout status.

Signed-off-by: Muhammad Shakeel <muhammad_shakeel at mentor.com>
---
 .../portmap/portmap/pid_file_creation.patch        |  162 ++++++++++++++++++++
 recipes-connectivity/portmap/portmap_6.0.bbappend  |    3 +-
 2 files changed, 164 insertions(+), 1 deletion(-)

diff --git a/recipes-connectivity/portmap/portmap/pid_file_creation.patch b/recipes-connectivity/portmap/portmap/pid_file_creation.patch
new file mode 100644
index 0000000..ec99968
--- /dev/null
+++ b/recipes-connectivity/portmap/portmap/pid_file_creation.patch
@@ -0,0 +1,162 @@
+Create portmap.pid file at startup
+
+This patch has been taken from:
+http://debian.2.n7.nabble.com/Bug-448470-Portmap-does-not-start-if-a-random-user-has-a-process-named-portmap-td440179.html
+Witout this patch systemd service was failing to start because no pidfile
+was getting generated by portmap. This problem is solved by getting
+portmap to write a pidfile, making sure the correct process is checked by
+the start script instead of a random one with the portmap name.
+
+Upstream-Status: Pending
+
+Signed-off-by: Muhammad Shakeel <muhammad_shakeel at mentor.com>
+===================================================================
+--- portmap-6.0.orig/portmap.c
++++ portmap-6.0/portmap.c
+@@ -98,6 +98,8 @@
+
+ #include <stdlib.h>
+ #include <pwd.h>
++#include <stdarg.h>
++#include <sys/stat.h>
+
+ #ifndef LOG_PERROR
+ #define LOG_PERROR 0
+@@ -169,6 +171,126 @@
+        int priv;
+ };
+
++#ifndef PIDFILE
++#  define PIDFILE "/var/run/portmap.pid"
++#endif
++
++/*
++ * Copied from the atd source
++ */
++static int
++lock_fd(int fd)
++{
++    struct flock lock;
++
++    lock.l_type = F_WRLCK;
++    lock.l_whence = SEEK_SET;
++    lock.l_start = 0;
++    lock.l_len = 0;
++
++    return fcntl(fd, F_SETLK, &lock);
++}
++
++void
++perr(const char *fmt,...)
++{
++    char buf[1024];
++    va_list args;
++
++    va_start(args, fmt);
++    vsnprintf(buf, sizeof(buf), fmt, args);
++    va_end(args);
++
++    if (debugging) {
++       perror(buf);
++    } else
++       syslog(LOG_ERR, "%s: %m", buf);
++
++    exit(EXIT_FAILURE);
++}
++
++void
++pabort(const char *fmt,...)
++{
++    char buf[1024];
++    va_list args;
++
++    va_start(args, fmt);
++    vsnprintf(buf, sizeof(buf), fmt, args);
++    va_end(args);
++
++    if (debugging) {
++       fprintf(stderr, "%s\n", buf);
++    } else
++       syslog(LOG_ERR, "%s", buf);
++
++    exit(EXIT_FAILURE);
++}
++
++FILE *
++save_pidfile(void) {
++    pid_t pid;
++    int fd;
++    FILE *fp;
++    fd = open(PIDFILE, O_RDWR | O_CREAT | O_EXCL,
++             S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH);
++
++    if (fd == -1) {
++
++       if (errno != EEXIST)
++           perr("Cannot open " PIDFILE);
++
++       if ((fd = open(PIDFILE, O_RDWR)) < 0)
++           perr("Cannot open " PIDFILE);
++
++       fp = fdopen(fd, "rw");
++       if (fp == NULL) {
++           perr("Cannot open " PIDFILE " for reading");
++       }
++       pid = -1;
++       if ((fscanf(fp, "%d", &pid) != 1) || (pid == getpid())
++           || (lock_fd(fileno(fp)) == 0)) {
++           int rc;
++
++           syslog(LOG_NOTICE, "Removing stale lockfile for pid %d", pid);
++
++           rc = unlink(PIDFILE);
++
++           if (rc == -1) {
++               perr("Cannot unlink " PIDFILE);
++           }
++       } else {
++           pabort("Another atd already running with pid %d", pid);
++       }
++       fclose(fp);
++
++       unlink(PIDFILE);
++       fd = open(PIDFILE, O_RDWR | O_CREAT | O_EXCL,
++                 S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH);
++
++
++       if (fd == -1)
++           perr("Cannot open " PIDFILE " the second time round");
++
++    }
++
++    if (lock_fd(fd) == -1)
++       perr("Cannot lock " PIDFILE);
++
++    fp = fdopen(fd, "w");
++    if (fp == NULL)
++       perr("Special weirdness: fdopen failed");
++
++    fprintf(fp, "%d\n", getpid());
++
++    /* We do NOT close fd, since we want to keep the lock. However, we don't
++     * want to keep the file descriptor in case of an exec().
++     */
++    fflush(fp);
++    fcntl(fd, F_SETFD, (long) 1);
++    return fp;
++}
++
+ int
+ main(int argc, char **argv)
+ {
+@@ -252,6 +374,8 @@
+                exit(1);
+        }
+
++       save_pidfile();
++
+ #ifdef LOG_DAEMON
+        openlog("portmap", LOG_PID|LOG_NDELAY | ( foreground ? LOG_PERROR : 0),
+            FACILITY);
+
+
diff --git a/recipes-connectivity/portmap/portmap_6.0.bbappend b/recipes-connectivity/portmap/portmap_6.0.bbappend
index 0432982..512b826 100644
--- a/recipes-connectivity/portmap/portmap_6.0.bbappend
+++ b/recipes-connectivity/portmap/portmap_6.0.bbappend
@@ -1,4 +1,4 @@
-PRINC := "${@int(PRINC) + 5}"
+PRINC := "${@int(PRINC) + 6}"
 
 # Find local ${PN} directory
 FILESEXTRAPATHS := "${THISDIR}/${PN}"
@@ -12,6 +12,7 @@ FILES_${PN} =+ "${systemd_unitdir}/system/portmap.service"
 
 SRC_URI_append = " \
     file://portmap.service \
+    file://pid_file_creation.patch\
     "
 
 do_install_append() {
-- 
1.7.9.5