Adds signal handling around popen/pclose in mail.c.

Related information on bugs #8992 and #14032
Original patch by D. Parthey

diff --git a/ext/standard/mail.c b/ext/standard/mail.c
index e3b6686f5f9a0add4996a68ad07f90cfa2adf69f..02b3b02ca7493b5334bcd12dd07ac73528e76711 100644 (file)
--- a/ext/standard/mail.c
+++ b/ext/standard/mail.c
@@ -31,6 +31,12 @@
 #include <sys/sysexits.h>
 #endif
 
+#if PHP_SIGCHILD
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#endif
+
 #include "php_mail.h"
 #include "php_ini.h"
 #include "exec.h"
@@ -187,6 +193,9 @@ PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char
        int ret;
        char *sendmail_path = INI_STR("sendmail_path");
        char *sendmail_cmd = NULL;
+#if PHP_SIGCHILD
+       void (*sig_handler)() = NULL;
+#endif
 
        if (!sendmail_path) {
 #if (defined PHP_WIN32 || defined NETWARE)
@@ -211,6 +220,16 @@ PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char
                sendmail_cmd = sendmail_path;
        }
 
+#if PHP_SIGCHILD
+       /* Set signal handler of SIGCHLD to default to prevent other signal handlers
+        * from being called and reaping the return code when our child exits.
+        * The original handler needs to be restored after pclose() */
+       sig_handler = (void *)signal(SIGCHLD, SIG_DFL);
+       if (sig_handler == SIG_ERR) {
+               sig_handler = NULL;
+       }
+#endif
+
 #ifdef PHP_WIN32
        sendmail = popen(sendmail_cmd, "wb");
 #else
@@ -229,6 +248,13 @@ PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char
                if (EACCES == errno) {
                        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Permission denied: unable to execute shell to run mail delivery binary '%s'", sendmail_path);
                        pclose(sendmail);
+#if PHP_SIGCHILD
+                       /* Restore handler in case of error on Windows
+                          Not sure if this applicable on Win but just in case. */
+                       if (sig_handler) {
+                               signal(SIGCHLD, sig_handler);
+                       }
+#endif
                        return 0;
                }
 #endif
@@ -240,6 +266,12 @@ PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char
                fprintf(sendmail, "\n%s\n", message);
                ret = pclose(sendmail);
 
+#if PHP_SIGCHILD
+               if (sig_handler) {
+                       signal(SIGCHLD, sig_handler);
+               }
+#endif
+
 #ifdef PHP_WIN32
                if (ret == -1)
 #else
@@ -258,6 +290,11 @@ PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char
                }
        } else {
                php_error_docref(NULL TSRMLS_CC, E_WARNING, "Could not execute mail delivery program '%s'", sendmail_path);
+#if PHP_SIGCHILD
+               if (sig_handler) {
+                       signal(SIGCHLD, sig_handler);                                           
+               }
+#endif
                return 0;
        }