{"id":3438,"date":"2017-07-21T20:15:21","date_gmt":"2017-07-21T12:15:21","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3438"},"modified":"2017-07-21T20:15:21","modified_gmt":"2017-07-21T12:15:21","slug":"linux%e4%b8%8b%e5%ae%88%e6%8a%a4%e8%bf%9b%e7%a8%8b%e7%9a%84c%e8%af%ad%e8%a8%80%e5%ae%9e%e7%8e%b02","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3438.html","title":{"rendered":"LINUX\u4e0b\u5b88\u62a4\u8fdb\u7a0b\u7684C\u8bed\u8a00\u5b9e\u73b0#2"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u4ee5\u540e\u4f30\u8ba1\u4f1a\u7ecf\u5e38\u548cdaemon\u8fdb\u7a0b\u6253\u4ea4\u9053\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u6574\u7406\u4e00\u4e0bLinux\u7684C\u8bed\u8a00\u4e2ddaemon\u8fdb\u7a0b\u7f16\u5199\u7684\u51fd\u6570\uff0c\u65b9\u4fbf\u4ee5\u540e\u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
\n
\n
\n
\n\n\n\n
\n
\n
#include <unistd.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
#include <fcntl.h><\/code><\/div>\n
#include <syslog.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
#include <stdio.h><\/code><\/div>\n
#include <sys\/stat.h><\/code><\/div>\n
#include <sys\/resource.h><\/code><\/div>\n
#include <errno.h>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/* for definition of errno *\/<\/code><\/div>\n
#include <stdarg.h>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/* ISO C variable aruments *\/<\/code><\/div>\n
<\/div>\n
<\/div>\n
#define LOCKFILE\u00a0<\/code>\"\/var\/run\/daemon.pid\"<\/code><\/div>\n
#define LOCKMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)<\/code><\/div>\n
#define MAXLINE\u00a0<\/code>4096<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/* max line length *\/<\/code><\/div>\n
<\/div>\n
<\/div>\n
\/*<\/code><\/div>\n
\u00a0<\/code>* Print a message and return to caller.<\/code><\/div>\n
\u00a0<\/code>* Caller specifies \"errnoflag\".<\/code><\/div>\n
\u00a0<\/code>*\/<\/code><\/div>\n
static<\/code>\u00a0void<\/code><\/div>\n
err_doit(<\/code>int<\/code>\u00a0errnoflag,\u00a0<\/code>int<\/code>\u00a0error,\u00a0<\/code>const<\/code>\u00a0char<\/code>\u00a0*fmt, va_list ap)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0\u00a0\u00a0\u00a0buf[MAXLINE];<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>vsnprintf(buf, MAXLINE, fmt, ap);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(errnoflag)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>snprintf(buf+strlen(buf), MAXLINE-strlen(buf),\u00a0<\/code>\": %s\"<\/code>,<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>strerror(error));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strcat(buf,\u00a0<\/code>\"\\n\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fflush(stdout);\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/* in case stdout and stderr are the same *\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fputs(buf, stderr);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fflush(NULL);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\/* flushes all stdio output streams *\/<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
\/*<\/code><\/div>\n
\u00a0<\/code>* Fatal error unrelated to a system call.<\/code><\/div>\n
\u00a0<\/code>* Print a message and terminate.<\/code><\/div>\n
\u00a0<\/code>*\/<\/code><\/div>\n
void<\/code><\/div>\n
err_quit(<\/code>const<\/code>\u00a0char<\/code>\u00a0*fmt, ...)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>va_list\u00a0\u00a0\u00a0\u00a0 ap;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>va_start(ap, fmt);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>err_doit(<\/code>0<\/code>,\u00a0<\/code>0<\/code>, fmt, ap);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>va_end(ap);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
int<\/code><\/div>\n
lockfile(<\/code>int<\/code>\u00a0fd)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>struct flock fl;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fl.l_type = F_WRLCK;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fl.l_start =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fl.l_whence = SEEK_SET;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fl.l_len =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>(fcntl(fd, F_SETLK, &fl));<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
int<\/code><\/div>\n
already_running(<\/code>void<\/code>)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0fd;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0\u00a0\u00a0\u00a0buf[<\/code>16<\/code>];<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fd = open(LOCKFILE, O_RDWR|O_CREAT, LOCKMODE);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(fd <\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"can't open %s: %s\"<\/code>, LOCKFILE, strerror(errno));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(lockfile(fd) <\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(errno == EACCES || errno == EAGAIN) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>close(fd);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"can't lock %s: %s\"<\/code>, LOCKFILE, strerror(errno));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>ftruncate(fd,\u00a0<\/code>0<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>sprintf(buf,\u00a0<\/code>\"%ld\"<\/code>, (<\/code>long<\/code>)getpid());<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>write(fd, buf, strlen(buf)+<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>(<\/code>0<\/code>);<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
void<\/code><\/div>\n
daemonize(<\/code>const<\/code>\u00a0char<\/code>\u00a0*cmd)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0i, fd0, fd1, fd2;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>pid_t\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 pid;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>struct rlimit\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 rl;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Initialize the log file.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>openlog(cmd, LOG_CONS, LOG_DAEMON);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Clear file creation mask.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>umask(<\/code>0<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Get maximum number of file descriptors.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(getrlimit(RLIMIT_NOFILE, &rl) <\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"%s: can't get file limit\"<\/code>, cmd);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Become a session leader to lose controlling TTY.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0((pid = fork()) <\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"%s: can't fork\"<\/code>, cmd);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0if<\/code>\u00a0(pid !=\u00a0<\/code>0<\/code>)\u00a0<\/code>\/* parent *\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>0<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>setsid();<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Ensure future opens won't allocate controlling TTYs.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0((pid = fork()) <\u00a0<\/code>0<\/code>){<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"%s: can't fork\"<\/code>, cmd);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0if<\/code>\u00a0(pid !=\u00a0<\/code>0<\/code>)\u00a0<\/code>\/* parent *\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>0<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Change the current working directory to the root so<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* we won't prevent file systems from being unmounted.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(chdir(<\/code>\"\/\"<\/code>) <\u00a0<\/code>0<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"%s: can't change directory to \/\"<\/code>, cmd);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Close all open file descriptors.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(rl.rlim_max == RLIM_INFINITY)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>rl.rlim_max =\u00a0<\/code>1024<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>\u00a0(i =\u00a0<\/code>0<\/code>; i < rl.rlim_max; i++)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>close(i);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Attach file descriptors 0, 1, and 2 to \/dev\/null.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fd0 = open(<\/code>\"\/dev\/null\"<\/code>, O_RDWR);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fd1 = dup(<\/code>0<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fd2 = dup(<\/code>0<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(fd0 !=\u00a0<\/code>0<\/code>\u00a0|| fd1 !=\u00a0<\/code>1<\/code>\u00a0|| fd2 !=\u00a0<\/code>2<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"%s: unexpected file descriptors %d %d %d\"<\/code>, cmd, fd0, fd1, fd2);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0*argv[])<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0*cmd;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0((cmd = strrchr(argv[<\/code>0<\/code>],\u00a0<\/code>'\/'<\/code>)) == NULL)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>cmd = argv[<\/code>0<\/code>];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>else<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>cmd++;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Become a daemon.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>daemonize(cmd);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* Make sure only one copy of the daemon is running.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(already_running()) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>syslog(LOG_ERR,\u00a0<\/code>\"daemon already running\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit(<\/code>1<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/*<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>* code here<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>*\/<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

 <\/p>\n

\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n

http:\/\/man7.org\/linux\/man-pages\/man3\/daemon.3.html<\/a><\/p>\n

https:\/\/stackoverflow.com\/questions\/17954432\/creating-a-daemon-in-linux<\/a>
\nhttp:\/\/alfred-sun.github.io\/blog\/2015\/06\/18\/daemon-implementation\/<\/a>
\nhttps:\/\/typecodes.com\/cseries\/apuesingledaemonprocess.html<\/a>
\nhttp:\/\/debugo.com\/apue-deamon\/<\/a>
\nhttps:\/\/notes.shichao.io\/apue\/ch13\/<\/a>\u00a0#\u91cc\u9762\u6709\u51e0\u5f20\u5f88\u68d2\u7684\u56fe<\/p>\n

=END=<\/p>\n","protected":false},"excerpt":{"rendered":"

=Start= \u7f18\u7531\uff1a \u4ee5\u540e\u4f30\u8ba1\u4f1a\u7ecf\u5e38\u548cdaemon\u8fdb\u7a0b\u6253\u4ea4\u9053\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u6574\u7406\u4e00\u4e0bLinux\u7684C\u8bed\u8a00\u4e2ddaem […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7],"tags":[100,717,30],"class_list":["post-3438","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","tag-c","tag-daemon","tag-linux"],"views":2840,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3438","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3438"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3438\/revisions"}],"predecessor-version":[{"id":3439,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3438\/revisions\/3439"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3438"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}