/*信号处理函数，向进程发送信号*/
ngx_int_t
ngx_signal_process(ngx_cycle_t *cycle, char *sig)
{
ssize_t n;
ngx_pid_t pid;
ngx_file_t file;
ngx_core_conf_t *ccf;
u_char buf[NGX_INT64_LEN + 2];
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "signal process started");
/*获取核心模块存储配置项结构体指针*/
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
ngx_memzero(&file, sizeof(ngx_file_t));
file.name = ccf->pid; //ccf->pid为nginx.pid文件
file.log = cycle->log;
/*以可读方式打开nginx.pid文件*/
file.fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY,
NGX_FILE_OPEN, NGX_FILE_DEFAULT_ACCESS);
if (file.fd == NGX_INVALID_FILE) {
ngx_log_error(NGX_LOG_ERR, cycle->log, ngx_errno,
ngx_open_file_n " \"%s\" failed", file.name.data);
return 1;
}
/*读文件*/
n = ngx_read_file(&file, buf, NGX_INT64_LEN + 2, 0);
if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
ngx_close_file_n " \"%s\" failed", file.name.data);
}
if (n == NGX_ERROR) {
return 1;
}
/*去掉结尾的控制字符*/
while (n-- && (buf[n] == CR || buf[n] == LF)) { /* void */ }
/*将字符串转换为数字，获取master进程pid*/
pid = ngx_atoi(buf, ++n);
if (pid == (ngx_pid_t) NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"invalid PID number \"%*s\" in \"%s\"",
n, buf, file.name.data);
return 1;
}
/*封装kill系统调用的信号发送函数*/
return ngx_os_signal_process(cycle, sig, pid);
}
static void
ngx_http_groonga_context_receive_handler_typed(grn_ctx *context,
int flags,
ngx_http_groonga_handler_data_t *data)
{
char *result = NULL;
unsigned int result_size = 0;
int recv_flags;
if (!(flags & GRN_CTX_TAIL)) {
return;
}
grn_ctx_recv(context, &result, &result_size, &recv_flags);
#ifdef NGX_GRN_SUPPORT_STOP_BY_COMMAND
if (recv_flags == GRN_CTX_QUIT) {
ngx_int_t ngx_rc;
ngx_int_t ngx_pid;
if (ngx_process == NGX_PROCESS_SINGLE) {
ngx_pid = getpid();
} else {
ngx_pid = getppid();
}
ngx_rc = ngx_os_signal_process((ngx_cycle_t *)ngx_cycle,
"quit",
ngx_pid);
if (ngx_rc == NGX_OK) {
context->stat &= ~GRN_CTX_QUIT;
grn_ctx_recv(context, &result, &result_size, &recv_flags);
context->stat |= GRN_CTX_QUIT;
} else {
context->rc = GRN_OPERATION_NOT_PERMITTED;
GRN_TEXT_PUTS(context, &(data->typed.body), "false");
context->stat &= ~GRN_CTX_QUIT;
}
}
#endif
if (result_size > 0 ||
GRN_TEXT_LEN(&(data->typed.body)) > 0 ||
context->rc != GRN_SUCCESS) {
if (result_size > 0) {
GRN_TEXT_PUT(context, &(data->typed.body), result, result_size);
}
grn_output_envelope(context,
context->rc,
&(data->typed.head),
&(data->typed.body),
&(data->typed.foot),
NULL,
0);
}
}
ngx_int_t
ngx_signal_process(ngx_cycle_t *cycle, char *sig)
{
ssize_t n;
ngx_pid_t pid;
ngx_file_t file;
ngx_core_conf_t *ccf;
u_char buf[NGX_INT64_LEN + 2];
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "signal process started");
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
ngx_memzero(&file, sizeof(ngx_file_t));
file.name = ccf->pid;
file.log = cycle->log;
file.fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY,
NGX_FILE_OPEN, NGX_FILE_DEFAULT_ACCESS);
if (file.fd == NGX_INVALID_FILE) {
ngx_log_error(NGX_LOG_ERR, cycle->log, ngx_errno,
ngx_open_file_n " \"%s\" failed", file.name.data);
return 1;
}
n = ngx_read_file(&file, buf, NGX_INT64_LEN + 2, 0);
if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
ngx_close_file_n " \"%s\" failed", file.name.data);
}
if (n == NGX_ERROR) {
return 1;
}
while (n-- && (buf[n] == CR || buf[n] == LF)) {
/* void */
}
pid = ngx_atoi(buf, ++n);
if (pid == (ngx_pid_t) NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"invalid PID number \"%*s\" in \"%s\"",
n, buf, file.name.data);
return 1;
}
return ngx_os_signal_process(cycle, sig, pid);
}