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added code to start dna helper, and detect when it has failed

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and restart it.
This commit is contained in:
gardners 2012-06-21 11:42:34 +09:30
parent dceeed8d35
commit 89d036822b
1 changed files with 33 additions and 0 deletions
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33
dna_helper.c
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@ -43,6 +43,39 @@ int dna_helper_stdout=-1;
int dna_helper_start(const char *command)
{
int stdin_fds[2];
int stdout_fds[2];
if (pipe(stdin_fds)) return -1;
if (pipe(stdout_fds)) {
close(stdin_fds[0]); close(stdin_fds[1]);
return -1;
}
int pid=-1;
if ((pid=fork())!=0) {
/* Child, should exec() to become helper after installing file descriptors. */
if (dup2(stdin_fds[1],0)) exit(-1); /* replace stdin */
if (dup2(stdout_fds[0],1)) exit(-1); /* replace stdout */
if (dup2(stdout_fds[0],2)) exit(-1); /* replace stderr */
execl(command,command,NULL);
/* execl() should never return, since it replaces this process with a new
one. Thus something bad must have happened. */
exit(-1);
} else {
if (pid==-1) {
/* fork failed */
close(stdin_fds[0]); close(stdin_fds[1]);
close(stdout_fds[0]); close(stdout_fds[1]);
return -1;
} else {
/* Parent, should put file descriptors into place for use */
dna_helper_stdin=stdin_fds[0];
dna_helper_stdout=stdout_fds[1];
return 0;
}
}
return -1;
}