Implement POSIX 2008 compliant logger(1)

This commit is contained in:
sin 2014-12-04 11:34:39 +00:00
parent 757cf0651a
commit 5d1e46fefa
5 changed files with 158 additions and 1 deletions

View File

@ -85,6 +85,7 @@ BIN =\
kill\ kill\
link\ link\
ln\ ln\
logger\
logname\ logname\
ls\ ls\
md5sum\ md5sum\

1
README
View File

@ -36,6 +36,7 @@ hostname
kill yes none kill yes none
link link
ln ln
logger yes
logname logname
ls ls
md5sum md5sum

1
TODO
View File

@ -13,7 +13,6 @@ find
getconf getconf
install install
join join
logger
make make
od od
patch patch

50
logger.1 Normal file
View File

@ -0,0 +1,50 @@
.Dd December 4, 2014
.Dt LOGGER 1 sbase\-VERSION
.Os
.Sh NAME
.Nm logger
.Nd make entries in the system log
.Sh SYNOPSIS
.Nm logger
.Op Fl is
.Op Fl p Ar priority
.Op Fl t Ar tag
.Op Ar message ...
.Sh DESCRIPTION
.Nm
provides a shell command interface to the
.Xr syslog 3
system log module.
.Pp
.Sh OPTIONS
.Bl -tag -width xxxxxxxxxxxx
.It Fl i
Log the process ID of the logger process with each line.
.It Fl p Ar priority
Enter the message with the specified priority. They priority
has to be specified symbolically as
.Dq facility.level
pair. The default is
.Dq user.notice .
.It Fl s
Log the message to standard error, as well as the system log.
.It Fl t Ar tag
Mark every line in the log with the specified
.Ar tag .
.It Ar message
Write the message to the log; if not specified, standard input
is logged.
.El
.Sh SEE ALSO
.Xr syslog 3 ,
.Xr syslogd 1
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Pp
The flags
.Op Fl ipst
are extensions to that specification.

106
logger.c Normal file
View File

@ -0,0 +1,106 @@
/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#define SYSLOG_NAMES
#include <syslog.h>
#include <unistd.h>
#include "util.h"
int
decodefac(char *fac)
{
CODE *c;
int facility = -1;
for (c = facilitynames; c->c_name; c++)
if (!strcasecmp(fac, c->c_name))
facility = c->c_val;
if (facility == -1)
eprintf("invalid facility name: %s\n", fac);
return facility & LOG_FACMASK;
}
int
decodelev(char *lev)
{
CODE *c;
int level = -1;
for (c = prioritynames; c->c_name; c++)
if (!strcasecmp(lev, c->c_name))
level = c->c_val;
if (level == -1)
eprintf("invalid level name: %s\n", lev);
return level & LOG_PRIMASK;
}
int
decodepri(char *pri)
{
char *p;
if (!(p = strchr(pri, '.')))
eprintf("invalid priority name: %s\n", pri);
*p++ = '\0';
if (!*p)
eprintf("invalid priority name: %s\n", pri);
return decodefac(pri) | decodelev(p);
}
static void
usage(void)
{
eprintf("usage: %s [-is] [-p priority] [-t tag] [message ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
char *buf = NULL, *tag = NULL;
size_t sz = 0;
int logflags = 0, priority = LOG_NOTICE;
int i;
ARGBEGIN {
case 'i':
logflags |= LOG_PID;
break;
case 'p':
priority = decodepri(EARGF(usage()));
break;
case 's':
logflags |= LOG_PERROR;
break;
case 't':
tag = EARGF(usage());
break;
default:
usage();
} ARGEND;
openlog(tag ? tag : getlogin(), logflags, 0);
if (argc == 0) {
while(getline(&buf, &sz, stdin) != -1)
syslog(priority, "%s", buf);
if (ferror(stdin))
eprintf("%s: read error:", "<stdin>");
} else {
for (i = 0; i < argc; i++)
sz += strlen(argv[i]);
sz += argc;
buf = ecalloc(1, sz);
for (i = 0; i < argc; i++) {
strlcat(buf, argv[i], sz);
if (i + 1 < argc)
strlcat(buf, " ", sz);
}
syslog(priority, "%s", buf);
}
free(buf);
closelog();
return 0;
}