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Implement POSIX 2008 compliant logger(1)
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logger.1
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logger.1
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.Dd December 4, 2014
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.Dt LOGGER 1 sbase\-VERSION
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.Os
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.Sh NAME
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.Nm logger
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.Nd make entries in the system log
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.Sh SYNOPSIS
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.Nm logger
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.Op Fl is
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.Op Fl p Ar priority
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.Op Fl t Ar tag
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.Op Ar message ...
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.Sh DESCRIPTION
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.Nm
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provides a shell command interface to the
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.Xr syslog 3
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system log module.
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.Pp
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.Sh OPTIONS
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.Bl -tag -width xxxxxxxxxxxx
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.It Fl i
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Log the process ID of the logger process with each line.
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.It Fl p Ar priority
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Enter the message with the specified priority. They priority
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has to be specified symbolically as
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.Dq facility.level
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pair. The default is
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.Dq user.notice .
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.It Fl s
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Log the message to standard error, as well as the system log.
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.It Fl t Ar tag
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Mark every line in the log with the specified
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.Ar tag .
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.It Ar message
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Write the message to the log; if not specified, standard input
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is logged.
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.El
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.Sh SEE ALSO
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.Xr syslog 3 ,
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.Xr syslogd 1
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.Sh STANDARDS
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The
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.Nm
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utility is compliant with the
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.St -p1003.1-2008
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specification.
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.Pp
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The flags
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.Op Fl ipst
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are extensions to that specification.
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logger.c
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logger.c
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/* See LICENSE file for copyright and license details. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#define SYSLOG_NAMES
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#include <syslog.h>
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#include <unistd.h>
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#include "util.h"
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int
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decodefac(char *fac)
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{
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CODE *c;
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int facility = -1;
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for (c = facilitynames; c->c_name; c++)
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if (!strcasecmp(fac, c->c_name))
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facility = c->c_val;
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if (facility == -1)
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eprintf("invalid facility name: %s\n", fac);
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return facility & LOG_FACMASK;
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}
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int
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decodelev(char *lev)
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{
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CODE *c;
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int level = -1;
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for (c = prioritynames; c->c_name; c++)
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if (!strcasecmp(lev, c->c_name))
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level = c->c_val;
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if (level == -1)
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eprintf("invalid level name: %s\n", lev);
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return level & LOG_PRIMASK;
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}
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int
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decodepri(char *pri)
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{
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char *p;
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if (!(p = strchr(pri, '.')))
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eprintf("invalid priority name: %s\n", pri);
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*p++ = '\0';
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if (!*p)
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eprintf("invalid priority name: %s\n", pri);
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return decodefac(pri) | decodelev(p);
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-is] [-p priority] [-t tag] [message ...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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char *buf = NULL, *tag = NULL;
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size_t sz = 0;
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int logflags = 0, priority = LOG_NOTICE;
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int i;
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ARGBEGIN {
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case 'i':
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logflags |= LOG_PID;
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break;
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case 'p':
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priority = decodepri(EARGF(usage()));
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break;
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case 's':
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logflags |= LOG_PERROR;
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break;
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case 't':
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tag = EARGF(usage());
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break;
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default:
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usage();
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} ARGEND;
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openlog(tag ? tag : getlogin(), logflags, 0);
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if (argc == 0) {
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while(getline(&buf, &sz, stdin) != -1)
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syslog(priority, "%s", buf);
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if (ferror(stdin))
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eprintf("%s: read error:", "<stdin>");
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} else {
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for (i = 0; i < argc; i++)
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sz += strlen(argv[i]);
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sz += argc;
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buf = ecalloc(1, sz);
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for (i = 0; i < argc; i++) {
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strlcat(buf, argv[i], sz);
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if (i + 1 < argc)
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strlcat(buf, " ", sz);
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}
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syslog(priority, "%s", buf);
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}
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free(buf);
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closelog();
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return 0;
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}
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