2 .\" Copyright (c) 2001 Andrew R. Reiter
3 .\" Copyright (c) 2004 Joerg Wunsch
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37 .Nd formatted output conversion
42 .Fn printf "const char *fmt" ...
44 .Fn tprintf "struct proc *p" "int pri" "const char *fmt" ...
46 .Fn uprintf "const char *fmt" ...
48 .Fn vprintf "const char *fmt" "va_list ap"
51 .Fn log "int pri" "const char *fmt" ...
53 .Fn vlog "int pri" "const char *fmt" "va_list ap"
57 family of functions are similar to the
60 The different functions each use a different output stream.
63 function outputs to the current process' controlling tty, while
65 writes to the console as well as to the logging facility.
68 function outputs to the tty associated with the process
70 and the logging facility if
75 function sends the message to the kernel logging facility, using
76 the log level as indicated by
78 and to the console if no process is yet reading the log.
80 Each of these related functions use the
82 parameter in the same manner as
86 adds two other conversion specifiers.
90 identifier expects two arguments: an
94 These are used as a register value and a print mask for decoding bitmasks.
95 The print mask is made up of two parts: the base and the
97 The base value is the output base expressed as an integer value;
98 for example, \e10 gives octal and \e20 gives hexadecimal.
99 The arguments are made up of a sequence of bit identifiers.
100 Each bit identifier begins with an integer value which is the number of the
101 bit (starting from 1) this identifier describes.
102 The rest of the identifier is a string of characters containing the name of
104 The string is terminated by either the bit number at the start of the next
107 for the last bit identifier.
111 identifier is meant to assist in hexdumps.
112 It requires two arguments: a
117 The memory pointed to by the pointer is output in hexadecimal one byte at
119 The string is used as a delimiter between individual bytes.
120 If present, a width directive will specify the number of bytes to display.
121 By default, 16 bytes of data are output.
133 parameter (mistakenly called
138 of \-1 is given, the message will be appended to the last log message
139 started by a previous call to
141 As these messages are generated by the kernel itself, the facility will
149 functions return the number of characters displayed.
151 This example demonstrates the use of the
155 conversion specifiers.
157 .Bd -literal -offset indent
162 printf("reg=%b\en", 3, "\e10\e2BITTWO\e1BITONE");
163 printf("out: %4D\en", "AAAA", ":");
167 will produce the following output:
168 .Bd -literal -offset indent
174 .Bd -literal -offset indent
175 log(LOG_DEBUG, "%s%d: been there.\en", sc->sc_name, sc->sc_unit);
178 will add the appropriate debug message at priority