| author | viric@llimona |
| Tue, 30 May 2006 12:34:25 +0200 | |
| changeset 57 | de776a4548da |
| parent 51 | a01abd65856a |
| permissions | -rw-r--r-- |
| 49 | 1 |
#include <sys/types.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <signal.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <sys/wait.h> // Per wait |
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#include <assert.h> // Pels assert |
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#include "syslog.h" |
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/* Variables */ |
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50
6958ce45aa83
Changing to static an internal module variable.
viric@llimona
parents:
49
diff
changeset
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static int childs_alive = 0; |
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static int child[MAX_CHILDS]; |
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/* Prototypes */ |
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static void remove_child(const int pid); |
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/* Code */ |
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void term_childs() |
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{
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int res; |
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int i; |
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sigset_t tmp, normal; |
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/* block the child signals */ |
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sigemptyset(&tmp); |
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sigaddset(&tmp, SIGCHLD); |
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sigprocmask(SIG_BLOCK, &tmp, &normal); |
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/* Send SIGTERM */ |
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for(i=0;i<childs_alive;i++) |
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{
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res = kill(child[i], SIGTERM); |
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51
a01abd65856a
The tcp server listen() started working. By now the connections are closed at once.
viric@llimona
parents:
50
diff
changeset
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fprintf(stderr, "Sent SIGTERM to %i\n", child[i]); |
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/* Accepting the res == -1 && errno == ESRCH saves us |
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* from the race condition possible kill error */ |
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if (res == -1) |
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assert( errno == ESRCH ); |
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} |
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/* restore the mask */ |
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sigprocmask(SIG_SETMASK, &normal, NULL); |
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} |
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void wait_childs_die() |
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{
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/* Wait for the end */ |
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while(childs_alive > 0) |
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{
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sleep(1); |
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} |
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} |
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void child_handler(int parameter) |
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{
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pid_t pid; |
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int status; |
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do |
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{
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pid = waitpid(-1, &status, WNOHANG); |
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if (pid == -1) |
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{
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if(errno == ECHILD) |
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{
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/* We don't have more childs! */ |
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fprintf(stderr, "We don't have more childs.\n"); |
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childs_alive = 0; |
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break; |
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} else |
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{
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fprintf(stderr, "waitpid failed. %s\n", |
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strerror(errno)); |
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break; |
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} |
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} |
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/* Debug */ |
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if (pid > 0) |
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{
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fprintf(stderr, "Child %i died: 0x%08x\n", |
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pid, status); |
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remove_child(pid); |
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} |
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} while(pid > 0); |
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} |
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int child_fork() |
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{
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int pid; |
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sigset_t tmp, normal; |
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/* block the child signals */ |
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sigemptyset(&tmp); |
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sigaddset(&tmp, SIGCHLD); |
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sigprocmask(SIG_BLOCK, &tmp, &normal); |
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if (childs_alive < MAX_CHILDS) |
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{
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pid = fork(); |
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} |
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else |
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{
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pid = -1; |
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} |
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if (pid > 0) |
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{
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/* Parent */ |
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/* MUTEX-ed actions with the SIGCHLD handler */ |
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child[childs_alive++] = pid; |
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} |
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/* restore the mask */ |
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sigprocmask(SIG_SETMASK, &normal, NULL); |
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return pid; |
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} |
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/* This will be called only from the SIGCHLD handler */ |
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static void remove_child(const int pid) |
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{
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int i; |
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/* We update the child status */ |
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for(i=0;i<childs_alive;i++) |
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{
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if(child[i] == pid) |
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break; |
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} |
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for(i = i; i < (childs_alive-1); i++) |
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{
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child[i] = child[i+1]; |
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} |
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childs_alive--; |
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} |
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int get_childs_alive() |
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{
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int num; |
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sigset_t tmp, normal; |
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/* block the child signals */ |
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sigemptyset(&tmp); |
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sigaddset(&tmp, SIGCHLD); |
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sigprocmask(SIG_BLOCK, &tmp, &normal); |
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num = childs_alive; |
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/* restore the mask */ |
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sigprocmask(SIG_SETMASK, &normal, NULL); |
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return num; |
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} |