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fix mongrel-like processes explosion
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#include "signal_handlers.h" | ||
#include <fcntl.h> | ||
#include <signal.h> | ||
#include <stdio.h> | ||
#include <stdlib.h> | ||
#include <sys/time.h> | ||
#include <unistd.h> | ||
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#define PPID_ALARM_INTERVAL 2 // send SIGALRM every this seconds | ||
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static pid_t orig_ppid; | ||
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static void signal_handler(int _) { | ||
exit(EXIT_FAILURE); | ||
} | ||
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static void check_ppid(void) { | ||
if (getppid() != orig_ppid) { | ||
exit(EXIT_FAILURE); | ||
} | ||
} | ||
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static void check_stdout_open(void) { | ||
if (fcntl(STDOUT_FILENO, F_GETFD) < 0) { | ||
exit(EXIT_FAILURE); | ||
} | ||
} | ||
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static void alarm_handler(int _) { | ||
check_ppid(); | ||
check_stdout_open(); | ||
alarm(PPID_ALARM_INTERVAL); | ||
signal(SIGALRM, alarm_handler); | ||
} | ||
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static void die(const char *msg) { | ||
fprintf(stderr, "\nFATAL: %s\n", msg); | ||
abort(); | ||
} | ||
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static void install_signal_handler(int sig, void (*handler)(int)) { | ||
if (signal(sig, handler) == SIG_ERR) { | ||
die("Could not install signal handler"); | ||
} | ||
} | ||
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void install_signal_handlers(void) { | ||
// check pipe is still connected | ||
check_stdout_open(); | ||
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// watch getppid() every PPID_ALARM_INTERVAL seconds | ||
orig_ppid = getppid(); | ||
if (orig_ppid <= 1) { | ||
die("prematurely zombied"); | ||
} | ||
install_signal_handler(SIGALRM, alarm_handler); | ||
alarm(PPID_ALARM_INTERVAL); | ||
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// be sure to exit on SIGHUP, SIGPIPE | ||
install_signal_handler(SIGHUP, signal_handler); | ||
install_signal_handler(SIGPIPE, signal_handler); | ||
} | ||
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/** | ||
* @headerfile signal_handlers.h | ||
* Signal handlers to stop the zombie hordes | ||
* | ||
* Catch and handle signals better so that we die faster like a good meat puppet. | ||
*/ | ||
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#ifndef fsevent_watch_signal_handlers_h | ||
#define fsevent_watch_signal_handlers_h | ||
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void install_signal_handlers(void); | ||
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#endif // fsevent_watch_signal_handlers_h |