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#include "foomaticrip.h"
#include "process.h"
#include <unistd.h>
#include "util.h"
#include <sys/wait.h>
#include <errno.h>
#include <stdlib.h>
int kidgeneration = 0;
struct process {
char name[64];
pid_t pid;
int isgroup;
};
#define MAX_CHILDS 4
struct process procs[MAX_CHILDS] = {
{ "", -1, 0 },
{ "", -1, 0 },
{ "", -1, 0 },
{ "", -1, 0 }
};
void add_process(const char *name, int pid, int isgroup)
{
int i;
for (i = 0; i < MAX_CHILDS; i++) {
if (procs[i].pid == -1) {
strlcpy(procs[i].name, name, 64);
procs[i].pid = pid;
procs[i].isgroup = isgroup;
return;
}
}
rip_die(EXIT_PRNERR_NORETRY_BAD_SETTINGS, "Didn't think there would be that many child processes... Exiting.\n");
}
int find_process(int pid)
{
int i;
for (i = 0; i < MAX_CHILDS; i++)
if (procs[i].pid == pid)
return i;
return -1;
}
void clear_proc_list()
{
int i;
for (i = 0; i < MAX_CHILDS; i++)
procs[i].pid = -1;
}
void kill_all_processes()
{
int i;
for (i = 0; i < MAX_CHILDS; i++) {
if (procs[i].pid == -1)
continue;
_log("Killing %s\n", procs[i].name);
kill(procs[i].isgroup ? -procs[i].pid : procs[i].pid, 15);
sleep(1 << (3 - kidgeneration));
kill(procs[i].isgroup ? -procs[i].pid : procs[i].pid, 9);
}
clear_proc_list();
}
static int _start_process(const char *name,
int (*proc_func)(FILE *, FILE *, void *),
void *user_arg, FILE **pipe_in, FILE **pipe_out,
int createprocessgroup)
{
pid_t pid;
int pfdin[2], pfdout[2];
int ret;
FILE *in, *out;
if (pipe_in)
pipe(pfdin);
if (pipe_out)
pipe(pfdout);
_log("Starting process \"%s\" (generation %d)\n", name, kidgeneration +1);
pid = fork();
if (pid < 0) {
_log("Could not fork for %s\n", name);
if (pipe_in) {
close(pfdin[0]);
close(pfdin[1]);
}
if (pipe_out) {
close(pfdout[0]);
close(pfdout[1]);
}
return -1;
}
if (pid == 0) { /* Child */
if (pipe_in) {
close(pfdin[1]);
in = fdopen(pfdin[0], "r");
}
else
in = NULL;
if (pipe_out) {
close(pfdout[0]);
out = fdopen(pfdout[1], "w");
}
else
out = NULL;
if (createprocessgroup)
setpgid(0, 0);
kidgeneration++;
/* The subprocess list is only valid for the parent. Clear it. */
clear_proc_list();
ret = proc_func(in, out, user_arg);
exit(ret);
}
/* Parent */
if (pipe_in) {
close(pfdin[0]);
*pipe_in = fdopen(pfdin[1], "w");
if (!*pipe_in)
_log("fdopen: %s\n", strerror(errno));
}
if (pipe_out) {
close(pfdout[1]);
*pipe_out = fdopen(pfdout[0], "r");
if (!*pipe_out)
_log("fdopen: %s\n", strerror(errno));
}
/* Add the child process to the list of open processes (to be able to kill
* them in case of a signal. */
add_process(name, pid, createprocessgroup);
return pid;
}
int exec_command(FILE *in, FILE *out, void *cmd)
{
if (in && dup2(fileno(in), fileno(stdin)) < 0)
rip_die(EXIT_PRNERR_NORETRY_BAD_SETTINGS, "%s: Could not dup stdin\n", (const char *)cmd);
if (out && dup2(fileno(out), fileno(stdout)) < 0)
rip_die(EXIT_PRNERR_NORETRY_BAD_SETTINGS, "%s: Could not dup stdout\n", (const char *)cmd);
execl(get_modern_shell(), get_modern_shell(), "-c", (const char *)cmd, (char *)NULL);
_log("Error: Executing \"%s -c %s\" failed (%s).\n", get_modern_shell(), (const char *)cmd, strerror(errno));
return EXIT_PRNERR_NORETRY_BAD_SETTINGS;
}
int start_system_process(const char *name, const char *command, FILE **fdin, FILE **fdout)
{
return _start_process(name, exec_command, (void*)command, fdin, fdout, 1);
}
int start_process(const char *name, int (*proc_func)(FILE *, FILE *, void *), void *user_arg, FILE **fdin, FILE **fdout)
{
return _start_process(name, proc_func, user_arg, fdin, fdout, 0);
}
int wait_for_process(int pid)
{
int i;
int status;
i = find_process(pid);
if (i < 0) {
_log("No such process \"%d\"", pid);
return -1;
}
waitpid(procs[i].pid, &status, 0);
if (WIFEXITED(status))
_log("%s exited with status %d\n", procs[i].name, WEXITSTATUS(status));
else if (WIFSIGNALED(status))
_log("%s received signal %d\n", procs[i].name, WTERMSIG(status));
/* remove from process list */
procs[i].pid = -1;
return status;
}
int run_system_process(const char *name, const char *command)
{
int pid = start_system_process(name, command, NULL, NULL);
return wait_for_process(pid);
}
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