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#ifndef _PRINT_C_ /* -*- linux-c -*- */
#define _PRINT_C_
#include <linux/config.h>
#include "string.h"
#include "io.c"
/** @file print.c
* Printing Functions.
*/
/** @addtogroup print Print Functions
* The print buffer is for collecting output to send to the user daemon.
* This is a per-cpu static buffer. The buffer is sent when
* _stp_print_flush() is called.
*
* The reason to do this is to allow multiple small prints to be combined then
* timestamped and sent together to stpd. This is more efficient than sending
* numerous small packets.
*
* This function is called automatically when the print buffer is full.
* It MUST also be called at the end of every probe that prints something.
* @{
*/
static int _stp_pbuf_len[NR_CPUS];
#ifdef STP_NETLINK_ONLY
#define STP_PRINT_BUF_START 0
/** Size of buffer, not including terminating NULL */
#ifndef STP_PRINT_BUF_LEN
#define STP_PRINT_BUF_LEN 8191
#endif
static char _stp_pbuf[NR_CPUS][STP_PRINT_BUF_LEN + 1];
void _stp_print_flush (void)
{
int cpu = smp_processor_id();
char *buf = &_stp_pbuf[cpu][0];
int len = _stp_pbuf_len[cpu];
int ret;
if (len == 0)
return;
ret =_stp_transport_write(_stp_tport, buf, len + 1);
if (unlikely(ret < 0))
atomic_inc (&_stp_transport_failures);
_stp_pbuf_len[cpu] = 0;
*buf = 0;
}
#else /* ! STP_NETLINK_ONLY */
/* size of timestamp, in bytes, including space */
#define TIMESTAMP_SIZE 11
#define STP_PRINT_BUF_START (TIMESTAMP_SIZE)
/** Size of buffer, not including terminating NULL */
#ifndef STP_PRINT_BUF_LEN
#define STP_PRINT_BUF_LEN (8192 - TIMESTAMP_SIZE - 2)
#endif
static char _stp_pbuf[NR_CPUS][STP_PRINT_BUF_LEN + STP_PRINT_BUF_START + 1];
/** Send the print buffer to the transport now.
* Output accumulates in the print buffer until it
* is filled, or this is called. This MUST be called before returning
* from a probe or accumulated output in the print buffer will be lost.
*/
void _stp_print_flush (void)
{
int cpu = smp_processor_id();
char *buf = &_stp_pbuf[cpu][0];
char *ptr = buf + STP_PRINT_BUF_START;
int seq;
if (_stp_pbuf_len[cpu] == 0)
return;
seq = _stp_seq_inc();
scnprintf (buf, TIMESTAMP_SIZE, "%10d", seq);
buf[TIMESTAMP_SIZE - 1] = ' ';
_stp_transport_write(_stp_tport, buf, _stp_pbuf_len[cpu] + TIMESTAMP_SIZE + 1);
_stp_pbuf_len[cpu] = 0;
*ptr = 0;
}
#endif /* STP_NETLINK_ONLY */
/** Print into the print buffer.
* Like printf, except output goes to the print buffer.
* Safe because overflowing the buffer is not allowed.
*
* @sa _stp_print_flush()
*/
#define _stp_printf(args...) _stp_sprintf(_stp_stdout,args)
/** Print into the print buffer.
* Use this if your function already has a va_list.
* You probably want _stp_printf().
*/
#define _stp_vprintf(fmt,args) _stp_vsprintf(_stp_stdout,fmt,args)
/** Write a C string into the print buffer.
* Copies a string into a print buffer.
* Safe because overflowing the buffer is not allowed.
* This is more efficient than using _stp_printf() if you don't
* need fancy formatting.
*
* @param str A C string.
* @sa _stp_print
*/
#define _stp_print_cstr(str) _stp_string_cat_cstr(_stp_stdout,str)
/** Write a String into the print buffer.
* Copies a String into a print buffer.
* Safe because overflowing the buffer is not allowed.
* This is more efficient than using _stp_printf() if you don't
* need fancy formatting.
*
* @param str A String.
* @sa _stp_print
*/
#define _stp_print_string(str) _stp_string_cat_string(_stp_stdout,str)
/* This function is used when printing maps or stats. */
/* Probably belongs elsewhere, but is here for now. */
/* It takes a format specification like those used for */
/* printing maps and stats. It prints chars until it sees */
/* a special format char (beginning with '%'. Then it */
/* returns a pointer to that. */
static char *next_fmt(char *fmt, int *num)
{
char *f = fmt;
int in_fmt = 0;
*num = 0;
while (*f) {
if (in_fmt) {
if (*f == '%') {
_stp_string_cat_char(_stp_stdout,'%');
in_fmt = 0;
} else if (*f > '0' && *f <= '9') {
*num = *f - '0';
f++;
return f;
} else
return f;
} else if (*f == '%')
in_fmt = 1;
else
_stp_string_cat_char(_stp_stdout,*f);
f++;
}
return f;
}
/** Write a String or C string into the print buffer.
* This macro selects the proper function to call.
* @param str A String or C string (char *)
* @sa _stp_print_cstr _stp_print_string
*/
#define _stp_print(str) \
({ \
if (__builtin_types_compatible_p (typeof (str), char[])) { \
char *x = (char *)str; \
_stp_string_cat_cstr(_stp_stdout,x); \
} else { \
String x = (String)str; \
_stp_string_cat_string(_stp_stdout,x); \
} \
})
/** @} */
#endif /* _PRINT_C_ */
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