From: Michael Gernoth Date: Fri, 14 Jun 2013 19:40:58 +0000 (+0200) Subject: add option to create a PID file in daemon-mode X-Git-Tag: v0.100~81 X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/hmcfgusb/commitdiff_plain/b0bf6ad2612d6459451e9a38cb1059b567990eb8?ds=inline add option to create a PID file in daemon-mode --- diff --git a/hmland.c b/hmland.c index c3981ab..519e02b 100644 --- a/hmland.c +++ b/hmland.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include @@ -39,6 +40,8 @@ #include "hexdump.h" #include "hmcfgusb.h" +#define PID_FILE "/var/run/hmland.pid" + extern char *optarg; static int impersonate_hmlanif = 0; @@ -379,7 +382,18 @@ static int comm(int fd_in, int fd_out, int master_socket) return 1; } -static int socket_server(char *iface, int port, int daemon) +void sigterm_handler(int sig) +{ + if (unlink(PID_FILE) == -1) + perror("Can't remove PID file"); + + exit(EXIT_SUCCESS); +} + +#define FLAG_DAEMON (1 << 0) +#define FLAG_PID_FILE (1 << 1) + +static int socket_server(char *iface, int port, int flags) { struct sigaction sact; struct sockaddr_in sin; @@ -387,22 +401,53 @@ static int socket_server(char *iface, int port, int daemon) int n; pid_t pid; - if (daemon) { + if (flags & FLAG_DAEMON) { + FILE *pidfile = NULL; + + if (flags & FLAG_PID_FILE) { + mode_t old_umask; + + old_umask = umask(022); + pidfile = fopen(PID_FILE, "w"); + umask(old_umask); + + if (!pidfile) { + perror("Can't create PID file " PID_FILE); + exit(EXIT_FAILURE); + } + + memset(&sact, 0, sizeof(sact)); + sact.sa_handler = sigterm_handler; + + if (sigaction(SIGTERM, &sact, NULL) == -1) { + perror("sigaction(SIGTERM)"); + exit(EXIT_FAILURE); + } + } + pid = fork(); if (pid > 0) { + if (pidfile) { + fprintf(pidfile, "%u\n", pid); + fclose(pidfile); + } + printf("Daemon with PID %u started!\n", pid); exit(EXIT_SUCCESS); } else if (pid < 0) { perror("fork"); exit(EXIT_FAILURE); } + + if (pidfile) + fclose(pidfile); } memset(&sact, 0, sizeof(sact)); sact.sa_handler = SIG_IGN; if (sigaction(SIGPIPE, &sact, NULL) == -1) { - perror("sigaction"); + perror("sigaction(SIGPIPE)"); exit(EXIT_FAILURE); } @@ -502,6 +547,7 @@ void hmlan_syntax(char *prog) fprintf(stderr, "\t-h\tthis help\n"); fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n"); fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n"); + fprintf(stderr, "\t-P\tcreate PID file " PID_FILE " in daemon mode\n"); fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n"); fprintf(stderr, "\t-v\tverbose mode\n"); @@ -512,22 +558,25 @@ int main(int argc, char **argv) int port = 1000; char *iface = NULL; int interactive = 0; - int daemon = 0; + int flags = 0; char *ep; int opt; - while((opt = getopt(argc, argv, "Ddhip:l:v")) != -1) { + while((opt = getopt(argc, argv, "DdhiPp:l:v")) != -1) { switch (opt) { case 'D': debug = 1; verbose = 1; break; case 'd': - daemon = 1; + flags |= FLAG_DAEMON; break; case 'i': interactive = 1; break; + case 'P': + flags |= FLAG_PID_FILE; + break; case 'p': port = strtoul(optarg, &ep, 10); if (*ep != '\0') { @@ -554,6 +603,6 @@ int main(int argc, char **argv) if (interactive) { return interactive_server(); } else { - return socket_server(iface, port, daemon); + return socket_server(iface, port, flags); } }