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From 62470498cca9a209aa9904668c1949f5229123af Mon Sep 17 00:00:00 2001
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From: Felix Kaechele <felix@kaechele.ca>
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Date: Tue, 20 Apr 2021 21:28:18 -0400
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Subject: [PATCH 2/2] fix PIDFile handling
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Corresponding RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1869026
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Rejected upstream: https://trac.nginx.org/nginx/ticket/1897
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Taken from: https://git.launchpad.net/ubuntu/+source/nginx/tree/debian/patches/nginx-fix-pidfile.patch
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From original patch:
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Author: Tj <ubuntu@iam.tj>
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Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/nginx/+bug/1581864
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Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876365
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iLast-Update: 2020-06-24
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Signed-off-by: Felix Kaechele <felix@kaechele.ca>
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---
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src/core/nginx.c | 24 +++++++++++++++++++++---
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src/os/unix/ngx_daemon.c | 8 ++++++--
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2 files changed, 27 insertions(+), 5 deletions(-)
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diff --git a/src/core/nginx.c b/src/core/nginx.c
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index 48a20e9..32c0afe 100644
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--- a/src/core/nginx.c
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+++ b/src/core/nginx.c
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@@ -339,14 +339,21 @@ main(int argc, char *const *argv)
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ngx_process = NGX_PROCESS_MASTER;
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}
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+ /* tell-tale to detect if this is parent or child process */
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+ ngx_int_t child_pid = NGX_BUSY;
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+
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#if !(NGX_WIN32)
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if (ngx_init_signals(cycle->log) != NGX_OK) {
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return 1;
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}
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+ /* tell-tale that this code has been executed */
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+ child_pid--;
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+
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if (!ngx_inherited && ccf->daemon) {
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- if (ngx_daemon(cycle->log) != NGX_OK) {
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+ child_pid = ngx_daemon(cycle->log);
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+ if (child_pid == NGX_ERROR) {
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return 1;
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}
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@@ -359,8 +366,19 @@ main(int argc, char *const *argv)
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#endif
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- if (ngx_create_pidfile(&ccf->pid, cycle->log) != NGX_OK) {
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- return 1;
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+ /* If ngx_daemon() returned the child's PID in the parent process
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+ * after the fork() set ngx_pid to the child_pid, which gets
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+ * written to the PID file, then exit.
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+ * For NGX_WIN32 always write the PID file
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+ * For others, only write it from the parent process */
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+ if (child_pid < NGX_OK || child_pid > NGX_OK) {
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+ ngx_pid = child_pid > NGX_OK ? child_pid : ngx_pid;
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+ if (ngx_create_pidfile(&ccf->pid, cycle->log) != NGX_OK) {
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+ return 1;
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+ }
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+ }
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+ if (child_pid > NGX_OK) {
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+ exit(0);
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}
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if (ngx_log_redirect_stderr(cycle) != NGX_OK) {
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diff --git a/src/os/unix/ngx_daemon.c b/src/os/unix/ngx_daemon.c
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index 385c49b..3719854 100644
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--- a/src/os/unix/ngx_daemon.c
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+++ b/src/os/unix/ngx_daemon.c
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@@ -7,14 +7,17 @@
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#include <ngx_config.h>
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#include <ngx_core.h>
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+#include <unistd.h>
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ngx_int_t
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ngx_daemon(ngx_log_t *log)
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{
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int fd;
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+ /* retain the return value for passing back to caller */
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+ pid_t pid_child = fork();
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- switch (fork()) {
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+ switch (pid_child) {
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case -1:
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ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "fork() failed");
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return NGX_ERROR;
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@@ -23,7 +26,8 @@ ngx_daemon(ngx_log_t *log)
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break;
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default:
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- exit(0);
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+ /* let caller do the exit() */
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+ return pid_child;
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}
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ngx_parent = ngx_pid;
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--
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2.31.1
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