[352] | 1 | #include <stdarg.h>
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| 2 | #include <sys/socket.h>
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| 3 | #include <stdio.h>
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| 4 | #include <unistd.h>
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| 5 | #include <syslog.h>
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| 6 | #include <time.h>
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| 7 | #include <signal.h>
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| 8 | #include <string.h>
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| 9 | #include <pthread.h>
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| 10 | #include <errno.h>
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| 11 | #include <fcntl.h>
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| 12 | #include "libc.h"
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| 13 |
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| 14 | static volatile int lock[2];
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| 15 | static char log_ident[32];
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| 16 | static int log_opt;
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| 17 | static int log_facility = LOG_USER;
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| 18 | static int log_mask = 0xff;
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| 19 | static int log_fd = -1;
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| 20 |
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| 21 | int setlogmask(int maskpri)
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| 22 | {
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| 23 | LOCK(lock);
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| 24 | int ret = log_mask;
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| 25 | if (maskpri) log_mask = maskpri;
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| 26 | UNLOCK(lock);
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| 27 | return ret;
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| 28 | }
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| 29 |
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| 30 | static const struct {
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| 31 | short sun_family;
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| 32 | char sun_path[9];
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| 33 | } log_addr = {
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| 34 | AF_UNIX,
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| 35 | "/dev/log"
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| 36 | };
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| 37 |
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| 38 | void closelog(void)
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| 39 | {
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| 40 | int cs;
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| 41 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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| 42 | LOCK(lock);
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| 43 | close(log_fd);
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| 44 | log_fd = -1;
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| 45 | UNLOCK(lock);
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| 46 | pthread_setcancelstate(cs, 0);
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| 47 | }
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| 48 |
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| 49 | static void __openlog()
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| 50 | {
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| 51 | log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
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| 52 | if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr);
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| 53 | }
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| 54 |
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| 55 | void openlog(const char *ident, int opt, int facility)
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| 56 | {
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| 57 | int cs;
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| 58 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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| 59 | LOCK(lock);
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| 60 |
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| 61 | if (ident) {
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| 62 | size_t n = strnlen(ident, sizeof log_ident - 1);
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| 63 | memcpy(log_ident, ident, n);
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| 64 | log_ident[n] = 0;
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| 65 | } else {
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| 66 | log_ident[0] = 0;
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| 67 | }
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| 68 | log_opt = opt;
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| 69 | log_facility = facility;
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| 70 |
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| 71 | if ((opt & LOG_NDELAY) && log_fd<0) __openlog();
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| 72 |
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| 73 | UNLOCK(lock);
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| 74 | pthread_setcancelstate(cs, 0);
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| 75 | }
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| 76 |
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| 77 | static int is_lost_conn(int e)
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| 78 | {
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| 79 | return e==ECONNREFUSED || e==ECONNRESET || e==ENOTCONN || e==EPIPE;
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| 80 | }
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| 81 |
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| 82 | static void _vsyslog(int priority, const char *message, va_list ap)
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| 83 | {
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| 84 | char timebuf[16];
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| 85 | time_t now;
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| 86 | struct tm tm;
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| 87 | char buf[1024];
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| 88 | int errno_save = errno;
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| 89 | int pid;
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| 90 | int l, l2;
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| 91 | int hlen;
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| 92 | int fd;
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| 93 |
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| 94 | if (log_fd < 0) __openlog();
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| 95 |
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| 96 | if (!(priority & LOG_FACMASK)) priority |= log_facility;
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| 97 |
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| 98 | now = time(NULL);
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| 99 | gmtime_r(&now, &tm);
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| 100 | strftime(timebuf, sizeof timebuf, "%b %e %T", &tm);
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| 101 |
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| 102 | pid = (log_opt & LOG_PID) ? getpid() : 0;
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| 103 | l = snprintf(buf, sizeof buf, "<%d>%s %n%s%s%.0d%s: ",
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| 104 | priority, timebuf, &hlen, log_ident, "["+!pid, pid, "]"+!pid);
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| 105 | errno = errno_save;
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| 106 | l2 = vsnprintf(buf+l, sizeof buf - l, message, ap);
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| 107 | if (l2 >= 0) {
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| 108 | if (l2 >= sizeof buf - l) l = sizeof buf - 1;
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| 109 | else l += l2;
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| 110 | if (buf[l-1] != '\n') buf[l++] = '\n';
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| 111 | if (send(log_fd, buf, l, 0) < 0 && (!is_lost_conn(errno)
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| 112 | || connect(log_fd, (void *)&log_addr, sizeof log_addr) < 0
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| 113 | || send(log_fd, buf, l, 0) < 0)
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| 114 | && (log_opt & LOG_CONS)) {
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| 115 | fd = open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
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| 116 | if (fd >= 0) {
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| 117 | dprintf(fd, "%.*s", l-hlen, buf+hlen);
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| 118 | close(fd);
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| 119 | }
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| 120 | }
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| 121 | if (log_opt & LOG_PERROR) dprintf(2, "%.*s", l-hlen, buf+hlen);
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| 122 | }
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| 123 | }
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| 124 |
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| 125 | void __vsyslog(int priority, const char *message, va_list ap)
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| 126 | {
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| 127 | int cs;
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| 128 | if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return;
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| 129 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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| 130 | LOCK(lock);
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| 131 | _vsyslog(priority, message, ap);
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| 132 | UNLOCK(lock);
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| 133 | pthread_setcancelstate(cs, 0);
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| 134 | }
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| 135 |
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| 136 | void syslog(int priority, const char *message, ...)
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| 137 | {
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| 138 | va_list ap;
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| 139 | va_start(ap, message);
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| 140 | __vsyslog(priority, message, ap);
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| 141 | va_end(ap);
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| 142 | }
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| 143 |
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| 144 | weak_alias(__vsyslog, vsyslog);
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