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suppres SIGHUP on forking #25

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suppres SIGHUP on forking #25

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15 changes: 15 additions & 0 deletions ccan/daemonize/daemonize.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
#include <ccan/daemonize/daemonize.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
Expand All @@ -10,14 +11,28 @@
* Environment. */
bool daemonize(void)
{
struct sigaction old_sa, sa;
pid_t pid;
int sa_rc;

/* SIGHUP may be thrown when the parent exits below.
So, set to ignore it and save previous action.
*/
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
sa_rc = sigaction(SIGHUP, &sa, &old_sa);

/* Separate from our parent via fork, so init inherits us. */
if ((pid = fork()) < 0)
return false;
if (pid != 0)
exit(0);

/* Restore previous SIGHUP action. */
if (sa_rc != -1)
sigaction(SIGHUP, &old_sa, NULL);

/* Don't hold files open. */
close(STDIN_FILENO);
close(STDOUT_FILENO);
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