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Replaced SIGUSR1 with socketpair for synchronization between parent and child processes on RECVFROM type addresses

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This commit is contained in:
Gerhard Rieger 2023-06-23 22:48:26 +02:00
parent a0e17a813a
commit 02483ff39e
12 changed files with 269 additions and 257 deletions

7
xio-listen.c
View file

@ -338,11 +338,7 @@ int _xioopen_listen(struct single *xfd, int xioflags, struct sockaddr *us, sockl
pid_t pid; /* mostly int; only used with fork */
sigset_t mask_sigchld;
/* we must prevent that the current packet triggers another fork;
therefore we wait for a signal from the recent child: USR1
indicates that is has consumed the last packet; CHLD means it has
terminated */
/* block SIGCHLD and SIGUSR1 until parent is ready to react */
/* Block SIGCHLD until parent is ready to react */
sigemptyset(&mask_sigchld);
sigaddset(&mask_sigchld, SIGCHLD);
Sigprocmask(SIG_BLOCK, &mask_sigchld, NULL);
@ -383,6 +379,7 @@ int _xioopen_listen(struct single *xfd, int xioflags, struct sockaddr *us, sockl
/* now we are ready to handle signals */
Sigprocmask(SIG_UNBLOCK, &mask_sigchld, NULL);
while (maxchildren) {
if (num_child < maxchildren) break;
Notice("maxchildren are active, waiting");