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child.c: consistent indentation

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wdlkmpx 2021-01-14 20:58:50 +08:00
parent 9a53cd2c48
commit d4b2abb5f9
1 changed files with 105 additions and 99 deletions
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204
src/child.c
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@ -22,120 +22,126 @@
volatile sig_atomic_t _child_writer_alive = 0; volatile sig_atomic_t _child_writer_alive = 0;
gboolean _child_writer_dead_warned = 0; gboolean _child_writer_dead_warned = 0;
int child_writer_alive(void) { int child_writer_alive(void){
return _child_writer_alive; return _child_writer_alive;
} }
int child_writer_dead_handler(void) { int child_writer_dead_handler(void) {
if(_child_writer_alive == 0 && _child_writer_dead_warned == 0) { if (_child_writer_alive == 0 && _child_writer_dead_warned == 0) {
_child_writer_dead_warned = 1; _child_writer_dead_warned = 1;
return 1; return 1;
} }
return 0; return 0;
} }
void child_process_score_writer(int chfd, gchar *score_file) { void child_process_score_writer(int chfd, gchar *score_file)
fd_set rfds; {
int i; fd_set rfds;
int fd=-1; int i;
gchar *buf; int fd=-1;
size_t sz; gchar *buf;
sigset_t sset; size_t sz;
struct flock lockinfo; sigset_t sset;
gchar *score_file_full = g_strconcat(LOCALSTATEDIR, score_file, NULL); struct flock lockinfo;
gchar *score_file_full = g_strconcat(LOCALSTATEDIR, score_file, NULL);
while(1) { while (1)
FD_ZERO(&rfds); {
FD_SET(chfd, &rfds); FD_ZERO(&rfds);
if(select(chfd + 1, &rfds, NULL, NULL, NULL) > 0) { FD_SET(chfd, &rfds);
if(read(chfd, &sz, sizeof(sz)) <= 0) { if (select(chfd + 1, &rfds, NULL, NULL, NULL) > 0)
exit(0); {
} if (read(chfd, &sz, sizeof(sz)) <= 0) {
/* block signals before writing, to prevent possible file corruption */ exit(0);
sigemptyset(&sset); }
sigaddset(&sset, SIGHUP); /* block signals before writing, to prevent possible file corruption */
sigaddset(&sset, SIGINT); sigemptyset(&sset);
sigaddset(&sset, SIGQUIT); sigaddset(&sset, SIGHUP);
sigaddset(&sset, SIGTERM); sigaddset(&sset, SIGINT);
sigprocmask(SIG_BLOCK, &sset, NULL); sigaddset(&sset, SIGQUIT);
fd = open(score_file_full, O_WRONLY | O_TRUNC); sigaddset(&sset, SIGTERM);
if(fd != -1) { sigprocmask(SIG_BLOCK, &sset, NULL);
/* get write lock before writing scores */ fd = open(score_file_full, O_WRONLY | O_TRUNC);
lockinfo.l_whence = SEEK_SET; if (fd != -1) {
lockinfo.l_start = 0; /* get write lock before writing scores */
lockinfo.l_len = 0; lockinfo.l_whence = SEEK_SET;
lockinfo.l_start = 0;
lockinfo.l_len = 0;
i = 0; i = 0;
while(1) { while (1) {
lockinfo.l_type=F_WRLCK; lockinfo.l_type=F_WRLCK;
if(!fcntl(fd, F_SETLK, &lockinfo)) break; if (!fcntl(fd, F_SETLK, &lockinfo)) {
if(i >= 3) { break;
close(fd); }
fd = -1; if (i >= 3) {
} close(fd);
i++; fd = -1;
} }
} i++;
while(sz > 0) { }
buf=g_malloc(sz); }
read(chfd, buf, sz); while (sz > 0) {
if(fd != -1) { buf=g_malloc(sz);
write(fd, buf, sz); read(chfd, buf, sz);
} if (fd != -1) {
g_free(buf); write(fd, buf, sz);
read(chfd, &sz, sizeof(sz)); }
} g_free(buf);
read(chfd, &sz, sizeof(sz));
}
if(fd != -1) { if (fd != -1) {
close(fd); close(fd);
} else { } else {
/* FIXME: here should be some sort of error /* FIXME: here should be some sort of error reporting to parent */
reporting to parent */ }
} sigprocmask(SIG_UNBLOCK, &sset, NULL);
sigprocmask(SIG_UNBLOCK, &sset, NULL); }
} }
}
} }
static void sigchld_handler(int param) { static void sigchld_handler(int param)
pid_t ret = waitpid(0, NULL, WNOHANG); {
pid_t ret = waitpid(0, NULL, WNOHANG);
if(ret > 0) { /* score writer process killed by bastards! */ if (ret > 0) { /* score writer process killed by bastards! */
_child_writer_alive = 0; _child_writer_alive = 0;
} }
} }
int child_setup(gchar *score_file) { int child_setup(gchar *score_file)
pid_t pid; {
struct sigaction sact; pid_t pid;
int sfds[2]; struct sigaction sact;
int sfds[2];
/* set up SIGCHLD handler, so we can know if our score writer process /* set up SIGCHLD handler, so we can know if our score writer process
terminated while we run... */ terminated while we run... */
sact.sa_handler = sigchld_handler; sact.sa_handler = sigchld_handler;
sigemptyset(&sact.sa_mask); sigemptyset(&sact.sa_mask);
sact.sa_flags = 0; sact.sa_flags = 0;
#ifdef SA_RESTART #ifdef SA_RESTART
sact.sa_flags |= SA_RESTART; sact.sa_flags |= SA_RESTART;
#endif #endif
if(sigaction(SIGCHLD, &sact, NULL) < 0) { if (sigaction(SIGCHLD, &sact, NULL) < 0) {
printf("cannot setup SIGCHLD handler.\n"); printf("cannot setup SIGCHLD handler.\n");
return -1; return -1;
} }
if(pipe(sfds) == -1) { if (pipe(sfds) == -1) {
printf("pipe() failed: %s\n", strerror(errno)); printf("pipe() failed: %s\n", strerror(errno));
return -1; return -1;
} }
pid = fork(); pid = fork();
if(pid == -1) { if (pid == -1) {
printf("cannot fork: %s\n", strerror(errno)); printf("cannot fork: %s\n", strerror(errno));
return -1; return -1;
} else if(pid == 0) { } else if (pid == 0) {
close(sfds[1]); close(sfds[1]);
child_process_score_writer(sfds[0], score_file); child_process_score_writer(sfds[0], score_file);
} }
close(sfds[0]); close(sfds[0]);
_child_writer_alive = 1; _child_writer_alive = 1;
return sfds[1]; return sfds[1];
} }