2 .\" Copyright (c) 2001 Andrew R. Reiter
3 .\" Copyright (c) 2004 Joerg Wunsch
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33 .Nm printf , uprintf , tprintf, log
34 .Nd formatted output conversion
39 .Fn printf "const char *fmt" ...
41 .Fn tprintf "struct proc *p" "int pri" "const char *fmt" ...
43 .Fn uprintf "const char *fmt" ...
46 .Fn log "int pri" "const char *fmt" ...
50 family of functions are similar to the
53 The different functions each use a different output stream.
56 function outputs to the current process' controlling tty, while
58 writes to the console as well as to the logging facility.
61 function outputs to the tty associated with the process
63 and the logging facility if
68 function sends the message to the kernel logging facility, using
69 the log level as indicated by
71 and to the console if no process is yet reading the log.
73 Each of these related functions use the
75 parameter in the same manner as
79 adds two other conversion specifiers.
83 identifier expects two arguments: an
87 These are used as a register value and a print mask for decoding bitmasks.
88 The print mask is made up of two parts: the base and the
90 The base value is the output base expressed as an integer value;
91 for example, \e10 gives octal and \e20 gives hexadecimal.
92 The arguments are made up of a sequence of bit identifiers.
93 Each bit identifier begins with an integer value which is the number of the
94 bit (starting from 1) this identifier describes.
95 The rest of the identifier is a string of characters containing the name of
97 The string is terminated by either the bit number at the start of the next
100 for the last bit identifier.
104 identifier is meant to assist in hexdumps.
105 It requires two arguments: a
110 The memory pointed to be the pointer is output in hexadecimal one byte at
112 The string is used as a delimiter between individual bytes.
113 If present, a width directive will specify the number of bytes to display.
114 By default, 16 bytes of data are output.
126 parameter (mistakenly called
131 of \-1 is given, the message will be appended to the last log message
132 started by a previous call to
134 As these messages are generated by the kernel itself, the facility will
142 functions return the number of characters displayed.
144 This example demonstrates the use of the
148 conversion specifiers.
150 .Bd -literal -offset indent
155 printf("reg=%b\en", 3, "\e10\e2BITTWO\e1BITONE\en");
156 printf("out: %4D\en", "AAAA", ":");
160 will produce the following output:
161 .Bd -literal -offset indent
167 .Bd -literal -offset indent
168 log(LOG_DEBUG, "%s%d: been there.\en", sc->sc_name, sc->sc_unit);
171 will add the appropriate debug message at priority