1 #include <stdarg.h>
2 #include <sys/socket.h>
3 #include <stdio.h>
4 #include <unistd.h>
5 #include <time.h>
6 #include <signal.h>
7 #include <string.h>
8 #include <pthread.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include "lock.h"
12 #include "fork_impl.h"
13 #include <unsupported_api.h>
14 #include "locale_impl.h"
15 #include <syslog.h>
16
17 static volatile int lock[1];
18 static char log_ident[32];
19 static int log_opt;
20 static int log_facility = LOG_USER;
21 static int log_mask = 0xff;
22 static int log_fd = -1;
23 volatile int *const __syslog_lockptr = lock;
24
setlogmask(int maskpri)25 int setlogmask(int maskpri)
26 {
27 UNSUPPORTED_API_VOID(LITEOS_A);
28 LOCK(lock);
29 int ret = log_mask;
30 if (maskpri) log_mask = maskpri;
31 UNLOCK(lock);
32 return ret;
33 }
34
35 static const struct {
36 short sun_family;
37 char sun_path[9];
38 } log_addr = {
39 AF_UNIX,
40 "/dev/log"
41 };
42
closelog(void)43 void closelog(void)
44 {
45 int cs;
46 UNSUPPORTED_API_VOID(LITEOS_A);
47 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
48 LOCK(lock);
49 close(log_fd);
50 log_fd = -1;
51 UNLOCK(lock);
52 pthread_setcancelstate(cs, 0);
53 }
54
__openlognull55 static void __openlog()
56 {
57 UNSUPPORTED_API_VOID(LITEOS_A);
58 log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
59 if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr);
60 }
61
openlog(const char *ident, int opt, int facility)62 void openlog(const char *ident, int opt, int facility)
63 {
64 int cs;
65 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
66 LOCK(lock);
67
68 if (ident) {
69 size_t n = strnlen(ident, sizeof log_ident - 1);
70 memcpy(log_ident, ident, n);
71 log_ident[n] = 0;
72 } else {
73 log_ident[0] = 0;
74 }
75 log_opt = opt;
76 log_facility = facility;
77
78 if ((opt & LOG_NDELAY) && log_fd<0) __openlog();
79
80 UNLOCK(lock);
81 pthread_setcancelstate(cs, 0);
82 }
83
is_lost_conn(int e)84 static int is_lost_conn(int e)
85 {
86 return e==ECONNREFUSED || e==ECONNRESET || e==ENOTCONN || e==EPIPE;
87 }
88
_vsyslog(int priority, const char *message, va_list ap)89 static void _vsyslog(int priority, const char *message, va_list ap)
90 {
91 char timebuf[16];
92 time_t now;
93 struct tm tm;
94 char buf[1024];
95 int errno_save = errno;
96 int pid;
97 int l, l2;
98 int hlen;
99 int fd;
100
101 if (log_fd < 0) __openlog();
102
103 if (!(priority & LOG_FACMASK)) priority |= log_facility;
104
105 now = time(NULL);
106 gmtime_r(&now, &tm);
107 strftime_l(timebuf, sizeof timebuf, "%b %e %T", &tm, C_LOCALE);
108
109 pid = (log_opt & LOG_PID) ? getpid() : 0;
110 l = snprintf(buf, sizeof buf, "<%d>%s %n%s%s%.0d%s: ",
111 priority, timebuf, &hlen, log_ident, "["+!pid, pid, "]"+!pid);
112 errno = errno_save;
113 l2 = vsnprintf(buf+l, sizeof buf - l, message, ap);
114 if (l2 >= 0) {
115 if (l2 >= sizeof buf - l) l = sizeof buf - 1;
116 else l += l2;
117 if (buf[l-1] != '\n') buf[l++] = '\n';
118 if (send(log_fd, buf, l, 0) < 0 && (!is_lost_conn(errno)
119 || connect(log_fd, (void *)&log_addr, sizeof log_addr) < 0
120 || send(log_fd, buf, l, 0) < 0)
121 && (log_opt & LOG_CONS)) {
122 fd = open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
123 if (fd >= 0) {
124 dprintf(fd, "%.*s", l-hlen, buf+hlen);
125 close(fd);
126 }
127 }
128 if (log_opt & LOG_PERROR) dprintf(2, "%.*s", l-hlen, buf+hlen);
129 }
130 }
131
__vsyslog(int priority, const char *message, va_list ap)132 static void __vsyslog(int priority, const char *message, va_list ap)
133 {
134 int cs;
135 if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return;
136 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
137 LOCK(lock);
138 _vsyslog(priority, message, ap);
139 UNLOCK(lock);
140 pthread_setcancelstate(cs, 0);
141 }
142
syslog(int priority, const char *message, ...)143 void syslog(int priority, const char *message, ...)
144 {
145 UNSUPPORTED_API_VOID(LITEOS_A);
146 va_list ap;
147 va_start(ap, message);
148 __vsyslog(priority, message, ap);
149 va_end(ap);
150 }
151
152 weak_alias(__vsyslog, vsyslog);
153