lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "fdlog.h"
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "fdevent.h"
#include "log.h"
typedef struct fdlog_pipe {
pid_t pid;
int fds[2];
const char *cmd;
unix_time64_t start;
} fdlog_pipe;
struct fdlog_pipes_t {
fdlog_pipe *ptr;
uint32_t used;
uint32_t size;
};
static struct fdlog_pipes_t fdlog_pipes;
static pid_t
fdlog_pipe_spawn (const char * const fn, const int rfd)
{
char *args[4];
int devnull = fdevent_open_devnull();
pid_t pid;
if (-1 == devnull) {
return -1;
}
*(const char **)&args[0] = "/bin/sh";
*(const char **)&args[1] = "-c";
*(const char **)&args[2] = fn;
args[3] = NULL;
pid = fdevent_fork_execve(args[0], args, NULL, rfd, devnull, devnull, -1);
if (pid > 0) {
close(devnull);
}
else {
int errnum = errno;
close(devnull);
errno = errnum;
}
return pid;
}
__attribute_noinline__
static int
fdlog_pipe_restart (fdlog_pipe * const fdp, const unix_time64_t ts)
{
if (fdp->start + 5 < ts) { /* limit restart to once every 5 sec */
/* restart child process using existing pipe fds */
fdp->start = ts;
fdp->pid = fdlog_pipe_spawn(fdp->cmd, fdp->fds[0]);
}
return (fdp->pid > 0) ? 1 : -1;
}
void
fdlog_pipes_restart (const unix_time64_t ts)
{
for (uint32_t i = 0; i < fdlog_pipes.used; ++i) {
fdlog_pipe * const fdp = fdlog_pipes.ptr+i;
if (fdp->pid > 0) continue;
fdlog_pipe_restart(fdp, ts);
}
}
int
fdlog_pipes_waitpid_cb (const pid_t pid)
{
for (uint32_t i = 0; i < fdlog_pipes.used; ++i) {
fdlog_pipe * const fdp = fdlog_pipes.ptr+i;
if (fdp->pid != pid) continue;
fdp->pid = -1;
return fdlog_pipe_restart(fdp, log_monotonic_secs);
}
return 0;
}
void
fdlog_pipes_close (void)
{
for (uint32_t i = 0; i < fdlog_pipes.used; ++i) {
fdlog_pipe * const fdp = fdlog_pipes.ptr+i;
close(fdp->fds[0]);
if (fdp->fds[1] != STDERR_FILENO) close(fdp->fds[1]);
}
free(fdlog_pipes.ptr);
fdlog_pipes.ptr = NULL;
fdlog_pipes.used = 0;
fdlog_pipes.size = 0;
}
void
fdlog_pipes_abandon_pids (void)
{
for (uint32_t i = 0; i < fdlog_pipes.used; ++i) {
fdlog_pipe * const fdp = fdlog_pipes.ptr+i;
fdp->pid = -1;
}
}
void
fdlog_pipe_serrh (const int fd)
{
for (uint32_t i = 0; i < fdlog_pipes.used; ++i) {
fdlog_pipe * const fdp = fdlog_pipes.ptr+i;
if (fdp->fds[1] != fd) continue;
fdp->fds[1] = STDERR_FILENO;
break;
}
}
static void
fdlog_pipe_init (const char * const cmd, const int fds[2], const pid_t pid)
{
if (fdlog_pipes.used == fdlog_pipes.size) {
fdlog_pipes.size += 4;
fdlog_pipes.ptr =
realloc(fdlog_pipes.ptr, fdlog_pipes.size * sizeof(fdlog_pipe));
force_assert(fdlog_pipes.ptr);
}
fdlog_pipe * const fdp = fdlog_pipes.ptr + fdlog_pipes.used++;
fdp->cmd = cmd; /* note: cmd must persist in memory (or else copy here) */
fdp->fds[0] = fds[0];
fdp->fds[1] = fds[1];
fdp->pid = pid;
fdp->start = log_monotonic_secs;
}
static int
fdlog_pipe_open (const char * const fn)
{
int fds[2];
if (pipe(fds))
return -1;
fdevent_setfd_cloexec(fds[0]);
fdevent_setfd_cloexec(fds[1]);
pid_t pid = fdlog_pipe_spawn(fn, fds[0]);
if (pid > 0) {
/*(nonblocking write() from lighttpd)*/
if (0 != fdevent_fcntl_set_nb(fds[1])) { /*(ignore)*/ }
fdlog_pipe_init(fn, fds, pid);
return fds[1];
}
else {
int errnum = errno;
close(fds[0]);
close(fds[1]);
errno = errnum;
return -1;
}
}
int
fdlog_open (const char * const fn)
{
if (fn[0] != '|') { /*(permit symlinks)*/
int flags = O_APPEND | O_WRONLY | O_CREAT;
return fdevent_open_cloexec(fn, 1, flags, 0644);
}
else {
return fdlog_pipe_open(fn+1); /*(skip the '|')*/
}
}
int
fdlog_cycle (const char * const fn, int * const curfd)
{
if (fn[0] != '|') {
int fd = fdlog_open(fn);
if (-1 == fd) return -1; /*(error; leave *curfd as-is)*/
if (-1 != *curfd) close(*curfd);
*curfd = fd;
}
return *curfd;
}