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util: Redirect stdin, stdout, and stderr to /dev/null in case of demonize #11219

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util: Redirect stdin, stdout, and stderr to /dev/null in case of demonize #11219

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25 changes: 23 additions & 2 deletions src/flb_utils.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,10 @@
#include <string.h>
#include <time.h>
#include <ctype.h>
#ifdef FLB_HAVE_FORK
#include <fcntl.h>
#include <unistd.h>
#endif

#include <sys/types.h>
#include <sys/stat.h>
Expand Down Expand Up @@ -177,6 +181,7 @@ void flb_utils_warn_c(const char *msg)
/* Run current process in background mode */
int flb_utils_set_daemon(struct flb_config *config)
{
int fd;
pid_t pid;

if ((pid = fork()) < 0){
Expand All @@ -202,8 +207,24 @@ int flb_utils_set_daemon(struct flb_config *config)
/* Our last STDOUT messages */
flb_info("switching to background mode (PID=%ld)", (long) getpid());

fclose(stderr);
fclose(stdout);
/* Redirect stdin, stdout, stderr to `/dev/null`. */
fd = open("/dev/null", O_RDWR);
if (fd == -1) {
flb_error("Failed to open /dev/null for daemonization");
return -1;
}

if (dup2(fd, STDIN_FILENO) == -1 ||
dup2(fd, STDOUT_FILENO) == -1 ||
dup2(fd, STDERR_FILENO) == -1) {
close(fd);
flb_error("Failed to redirect standard file descriptors to /dev/null");
return -1;
}

if (fd > 2) {
close(fd);
}

return 0;
}
Expand Down