diff options
Diffstat (limited to 'libc-top-half/musl/src/misc/syslog.c')
| -rw-r--r-- | libc-top-half/musl/src/misc/syslog.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/misc/syslog.c b/libc-top-half/musl/src/misc/syslog.c new file mode 100644 index 0000000..b802acd --- /dev/null +++ b/libc-top-half/musl/src/misc/syslog.c @@ -0,0 +1,162 @@ +#include <stdarg.h> +#include <sys/socket.h> +#include <stdio.h> +#include <unistd.h> +#include <syslog.h> +#include <time.h> +#include <signal.h> +#include <string.h> +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) +#include <pthread.h> +#endif +#include <errno.h> +#include <fcntl.h> +#include "lock.h" +#include "fork_impl.h" + +static volatile int lock[1]; +static char log_ident[32]; +static int log_opt; +static int log_facility = LOG_USER; +static int log_mask = 0xff; +static int log_fd = -1; +volatile int *const __syslog_lockptr = lock; + +int setlogmask(int maskpri) +{ + LOCK(lock); + int ret = log_mask; + if (maskpri) log_mask = maskpri; + UNLOCK(lock); + return ret; +} + +static const struct { + short sun_family; + char sun_path[9]; +} log_addr = { + AF_UNIX, + "/dev/log" +}; + +void closelog(void) +{ +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + int cs; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); +#endif + LOCK(lock); + close(log_fd); + log_fd = -1; + UNLOCK(lock); +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + pthread_setcancelstate(cs, 0); +#endif +} + +static void __openlog() +{ + log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); + if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr); +} + +void openlog(const char *ident, int opt, int facility) +{ +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + int cs; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); +#endif + LOCK(lock); + + if (ident) { + size_t n = strnlen(ident, sizeof log_ident - 1); + memcpy(log_ident, ident, n); + log_ident[n] = 0; + } else { + log_ident[0] = 0; + } + log_opt = opt; + log_facility = facility; + + if ((opt & LOG_NDELAY) && log_fd<0) __openlog(); + + UNLOCK(lock); +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + pthread_setcancelstate(cs, 0); +#endif +} + +static int is_lost_conn(int e) +{ + return e==ECONNREFUSED || e==ECONNRESET || e==ENOTCONN || e==EPIPE; +} + +static void _vsyslog(int priority, const char *message, va_list ap) +{ + char timebuf[16]; + time_t now; + struct tm tm; + char buf[1024]; + int errno_save = errno; + int pid; + int l, l2; + int hlen; + int fd; + + if (log_fd < 0) __openlog(); + + if (!(priority & LOG_FACMASK)) priority |= log_facility; + + now = time(NULL); + gmtime_r(&now, &tm); + strftime(timebuf, sizeof timebuf, "%b %e %T", &tm); + + pid = (log_opt & LOG_PID) ? getpid() : 0; + l = snprintf(buf, sizeof buf, "<%d>%s %n%s%s%.0d%s: ", + priority, timebuf, &hlen, log_ident, "["+!pid, pid, "]"+!pid); + errno = errno_save; + l2 = vsnprintf(buf+l, sizeof buf - l, message, ap); + if (l2 >= 0) { + if (l2 >= sizeof buf - l) l = sizeof buf - 1; + else l += l2; + if (buf[l-1] != '\n') buf[l++] = '\n'; + if (send(log_fd, buf, l, 0) < 0 && (!is_lost_conn(errno) + || connect(log_fd, (void *)&log_addr, sizeof log_addr) < 0 + || send(log_fd, buf, l, 0) < 0) + && (log_opt & LOG_CONS)) { + fd = open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); + if (fd >= 0) { + dprintf(fd, "%.*s", l-hlen, buf+hlen); + close(fd); + } + } + if (log_opt & LOG_PERROR) dprintf(2, "%.*s", l-hlen, buf+hlen); + } +} + +static void __vsyslog(int priority, const char *message, va_list ap) +{ +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + int cs; +#endif + if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return; +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); +#endif + LOCK(lock); + _vsyslog(priority, message, ap); + UNLOCK(lock); +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + pthread_setcancelstate(cs, 0); +#endif +} + +void syslog(int priority, const char *message, ...) +{ + va_list ap; + va_start(ap, message); + __vsyslog(priority, message, ap); + va_end(ap); +} + +weak_alias(__vsyslog, vsyslog); |