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Add getconf(1)

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The logic is simple, it's just a pain in the ass to fill the
data-structures.
Some lines had to be commented out, as glibc/musl apparently
have not fully implemented the mandatory variables for the
2013 corrigendum of POSIX 2008.

Also added a manpage and the necessary entries in README.

I also removed it from the TODO.
This commit is contained in:
FRIGN 2015-10-01 00:59:40 +02:00 committed by sin
parent 98e7e75ec6
commit 05996b997c
5 changed files with 375 additions and 1 deletions
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1
Makefile
View File

@ -98,6 +98,7 @@ BIN =\
false\
find\
fold\
getconf\
grep\
head\
join\

1
README
View File

@ -36,6 +36,7 @@ The following tools are implemented:
=*|o false .
= find .
#*|o fold .
=* o getconf (-v)
=* o grep .
=*|o head .
=*|x hostname .

1
TODO
View File

@ -8,7 +8,6 @@ awk
bc
diff
ed
getconf
install
patch
pathchk

59
getconf.1 Normal file
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@ -0,0 +1,59 @@
.Dd October 1, 2015
.Dt GETCONF 1
.Os sbase
.Sh NAME
.Nm getconf
.Nd get configuration values
.Sh SYNOPSIS
.Nm
.Op Fl v Ar spec
.Ar var
.Ar [path]
.Sh DESCRIPTION
.Nm
writes the value of the variable
.Ar var
to stdout.
.sp
If
.Ar path
is given,
.Ar var
is matched against configuration values from
.Xr pathconf 3 .
If
.Ar path
is not given,
.Ar var
is matched against configuration values from
.Xr sysconf 3 ,
.Xr confstr 3
and limits.h (Minimum and Maximum).
.sp
If
.Ar var
is not defined or has not been found,
.Nm
writes "undefined" to stdout.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl v Ar spec
Ignored.
.El
.Sh EXIT STATUS
.Bl -tag -width Ds
.It 0
.Ar var
was matched and its value written successfully.
.It 1
An error occured or
.Ar var
was neither defined nor found.
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2013
specification except from the
.Op Fl v
flag.

314
getconf.c Normal file
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@ -0,0 +1,314 @@
/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
struct var {
const char *k;
long v;
};
static const struct var pathconf_l[] = {
{ "FILESIZEBITS", _PC_FILESIZEBITS },
{ "LINK_MAX", _PC_LINK_MAX },
{ "MAX_CANON", _PC_MAX_CANON },
{ "MAX_INPUT", _PC_MAX_INPUT },
{ "NAME_MAX", _PC_NAME_MAX },
{ "PATH_MAX", _PC_PATH_MAX },
{ "PIPE_BUF", _PC_PIPE_BUF },
{ "POSIX2_SYMLINKS", _PC_2_SYMLINKS },
{ "POSIX_ALLOC_SIZE_MIN", _PC_ALLOC_SIZE_MIN },
{ "POSIX_REC_INCR_XFER_SIZE", _PC_REC_INCR_XFER_SIZE },
{ "POSIX_REC_MAX_XFER_SIZE", _PC_REC_MAX_XFER_SIZE },
{ "POSIX_REC_MIN_XFER_SIZE", _PC_REC_MIN_XFER_SIZE },
{ "POSIX_REC_XFER_ALIGN", _PC_REC_XFER_ALIGN },
{ "SYMLINK_MAX", _PC_SYMLINK_MAX },
{ "_POSIX_CHOWN_RESTRICTED", _PC_CHOWN_RESTRICTED },
{ "_POSIX_NO_TRUNC", _PC_NO_TRUNC },
{ "_POSIX_VDISABLE", _PC_VDISABLE },
{ "_POSIX_ASYNC_IO", _PC_ASYNC_IO },
{ "_POSIX_PRIO_IO", _PC_PRIO_IO },
{ "_POSIX_SYNC_IO", _PC_SYNC_IO },
/*{ "_POSIX_TIMESTAMP_RESOLUTION", _PC_TIMESTAMP_RESOLUTION },*/
};
static const struct var sysconf_l[] = {
{ "AIO_LISTIO_MAX", _SC_AIO_LISTIO_MAX },
{ "AIO_MAX", _SC_AIO_MAX },
{ "AIO_PRIO_DELTA_MAX", _SC_AIO_PRIO_DELTA_MAX },
{ "ARG_MAX", _SC_ARG_MAX },
{ "ATEXIT_MAX", _SC_ATEXIT_MAX },
{ "BC_BASE_MAX", _SC_BC_BASE_MAX },
{ "BC_DIM_MAX", _SC_BC_DIM_MAX },
{ "BC_SCALE_MAX", _SC_BC_SCALE_MAX },
{ "BC_STRING_MAX", _SC_BC_STRING_MAX },
{ "CHILD_MAX", _SC_CHILD_MAX },
{ "COLL_WEIGHTS_MAX", _SC_COLL_WEIGHTS_MAX },
{ "DELAYTIMER_MAX", _SC_DELAYTIMER_MAX },
{ "EXPR_NEST_MAX", _SC_EXPR_NEST_MAX },
{ "HOST_NAME_MAX", _SC_HOST_NAME_MAX },
{ "IOV_MAX", _SC_IOV_MAX },
{ "LINE_MAX", _SC_LINE_MAX },
{ "LOGIN_NAME_MAX", _SC_LOGIN_NAME_MAX },
{ "NGROUPS_MAX", _SC_NGROUPS_MAX },
{ "MQ_OPEN_MAX", _SC_MQ_OPEN_MAX },
{ "MQ_PRIO_MAX", _SC_MQ_PRIO_MAX },
{ "OPEN_MAX", _SC_OPEN_MAX },
{ "_POSIX_ADVISORY_INFO", _SC_ADVISORY_INFO },
{ "_POSIX_BARRIERS", _SC_BARRIERS },
{ "_POSIX_ASYNCHRONOUS_IO", _SC_ASYNCHRONOUS_IO },
{ "_POSIX_CLOCK_SELECTION", _SC_CLOCK_SELECTION },
{ "_POSIX_CPUTIME", _SC_CPUTIME },
{ "_POSIX_FSYNC", _SC_FSYNC },
{ "_POSIX_IPV6", _SC_IPV6 },
{ "_POSIX_JOB_CONTROL", _SC_JOB_CONTROL },
{ "_POSIX_MAPPED_FILES", _SC_MAPPED_FILES },
{ "_POSIX_MEMLOCK", _SC_MEMLOCK },
{ "_POSIX_MEMLOCK_RANGE", _SC_MEMLOCK_RANGE },
{ "_POSIX_MEMORY_PROTECTION", _SC_MEMORY_PROTECTION },
{ "_POSIX_MESSAGE_PASSING", _SC_MESSAGE_PASSING },
{ "_POSIX_MONOTONIC_CLOCK", _SC_MONOTONIC_CLOCK },
{ "_POSIX_PRIORITIZED_IO", _SC_PRIORITIZED_IO },
{ "_POSIX_PRIORITY_SCHEDULING", _SC_PRIORITY_SCHEDULING },
{ "_POSIX_RAW_SOCKETS", _SC_RAW_SOCKETS },
{ "_POSIX_READER_WRITER_LOCKS", _SC_READER_WRITER_LOCKS },
{ "_POSIX_REALTIME_SIGNALS", _SC_REALTIME_SIGNALS },
{ "_POSIX_REGEXP", _SC_REGEXP },
{ "_POSIX_SAVED_IDS", _SC_SAVED_IDS },
{ "_POSIX_SEMAPHORES", _SC_SEMAPHORES },
{ "_POSIX_SHARED_MEMORY_OBJECTS", _SC_SHARED_MEMORY_OBJECTS },
{ "_POSIX_SHELL", _SC_SHELL },
{ "_POSIX_SPAWN", _SC_SPAWN },
{ "_POSIX_SPIN_LOCKS", _SC_SPIN_LOCKS },
{ "_POSIX_SPORADIC_SERVER", _SC_SPORADIC_SERVER },
{ "_POSIX_SS_REPL_MAX", _SC_SS_REPL_MAX },
{ "_POSIX_SYNCHRONIZED_IO", _SC_SYNCHRONIZED_IO },
{ "_POSIX_THREAD_ATTR_STACKADDR", _SC_THREAD_ATTR_STACKADDR },
{ "_POSIX_THREAD_ATTR_STACKSIZE", _SC_THREAD_ATTR_STACKSIZE },
{ "_POSIX_THREAD_CPUTIME", _SC_THREAD_CPUTIME },
{ "_POSIX_THREAD_PRIO_INHERIT", _SC_THREAD_PRIO_INHERIT },
{ "_POSIX_THREAD_PRIO_PROTECT", _SC_THREAD_PRIO_PROTECT },
{ "_POSIX_THREAD_PRIORITY_SCHEDULING", _SC_THREAD_PRIORITY_SCHEDULING },
{ "_POSIX_THREAD_PROCESS_SHARED", _SC_THREAD_PROCESS_SHARED },
{ "_POSIX_THREAD_ROBUST_PRIO_INHERIT", _SC_THREAD_ROBUST_PRIO_INHERIT },
{ "_POSIX_THREAD_ROBUST_PRIO_PROTECT", _SC_THREAD_ROBUST_PRIO_PROTECT },
{ "_POSIX_THREAD_SAFE_FUNCTIONS", _SC_THREAD_SAFE_FUNCTIONS },
{ "_POSIX_THREAD_SPORADIC_SERVER", _SC_THREAD_SPORADIC_SERVER },
{ "_POSIX_THREADS", _SC_THREADS },
{ "_POSIX_TIMEOUTS", _SC_TIMEOUTS },
{ "_POSIX_TIMERS", _SC_TIMERS },
{ "_POSIX_TRACE", _SC_TRACE },
{ "_POSIX_TRACE_EVENT_FILTER", _SC_TRACE_EVENT_FILTER },
{ "_POSIX_TRACE_EVENT_NAME_MAX", _SC_TRACE_EVENT_NAME_MAX },
{ "_POSIX_TRACE_INHERIT", _SC_TRACE_INHERIT },
{ "_POSIX_TRACE_LOG", _SC_TRACE_LOG },
{ "_POSIX_TRACE_NAME_MAX", _SC_TRACE_NAME_MAX },
{ "_POSIX_TRACE_SYS_MAX", _SC_TRACE_SYS_MAX },
{ "_POSIX_TRACE_USER_EVENT_MAX", _SC_TRACE_USER_EVENT_MAX },
{ "_POSIX_TYPED_MEMORY_OBJECTS", _SC_TYPED_MEMORY_OBJECTS },
{ "_POSIX_VERSION", _SC_VERSION },
{ "_POSIX_V7_ILP32_OFF32", _SC_V7_ILP32_OFF32 },
{ "_POSIX_V7_ILP32_OFFBIG", _SC_V7_ILP32_OFFBIG },
{ "_POSIX_V7_LP64_OFF64", _SC_V7_LP64_OFF64 },
{ "_POSIX_V7_LPBIG_OFFBIG", _SC_V7_LPBIG_OFFBIG },
{ "_POSIX2_C_BIND", _SC_2_C_BIND },
{ "_POSIX2_C_DEV", _SC_2_C_DEV },
{ "_POSIX2_CHAR_TERM", _SC_2_CHAR_TERM },
{ "_POSIX2_FORT_DEV", _SC_2_FORT_DEV },
{ "_POSIX2_FORT_RUN", _SC_2_FORT_RUN },
{ "_POSIX2_LOCALEDEF", _SC_2_LOCALEDEF },
{ "_POSIX2_PBS", _SC_2_PBS },
{ "_POSIX2_PBS_ACCOUNTING", _SC_2_PBS_ACCOUNTING },
{ "_POSIX2_PBS_CHECKPOINT", _SC_2_PBS_CHECKPOINT },
{ "_POSIX2_PBS_LOCATE", _SC_2_PBS_LOCATE },
{ "_POSIX2_PBS_MESSAGE", _SC_2_PBS_MESSAGE },
{ "_POSIX2_PBS_TRACK", _SC_2_PBS_TRACK },
{ "_POSIX2_SW_DEV", _SC_2_SW_DEV },
{ "_POSIX2_UPE", _SC_2_UPE },
{ "_POSIX2_VERSION", _SC_2_VERSION },
{ "PAGE_SIZE", _SC_PAGE_SIZE },
{ "PAGESIZE", _SC_PAGESIZE },
{ "PTHREAD_DESTRUCTOR_ITERATIONS", _SC_THREAD_DESTRUCTOR_ITERATIONS },
{ "PTHREAD_KEYS_MAX", _SC_THREAD_KEYS_MAX },
{ "PTHREAD_STACK_MIN", _SC_THREAD_STACK_MIN },
{ "PTHREAD_THREADS_MAX", _SC_THREAD_THREADS_MAX },
{ "RE_DUP_MAX", _SC_RE_DUP_MAX },
{ "RTSIG_MAX", _SC_RTSIG_MAX },
{ "SEM_NSEMS_MAX", _SC_SEM_NSEMS_MAX },
{ "SEM_VALUE_MAX", _SC_SEM_VALUE_MAX },
{ "SIGQUEUE_MAX", _SC_SIGQUEUE_MAX },
{ "STREAM_MAX", _SC_STREAM_MAX },
{ "SYMLOOP_MAX", _SC_SYMLOOP_MAX },
{ "TIMER_MAX", _SC_TIMER_MAX },
{ "TTY_NAME_MAX", _SC_TTY_NAME_MAX },
{ "TZNAME_MAX", _SC_TZNAME_MAX },
{ "_XOPEN_CRYPT", _SC_XOPEN_CRYPT },
{ "_XOPEN_ENH_I18N", _SC_XOPEN_ENH_I18N },
{ "_XOPEN_REALTIME", _SC_XOPEN_REALTIME },
{ "_XOPEN_REALTIME_THREADS", _SC_XOPEN_REALTIME_THREADS },
{ "_XOPEN_SHM", _SC_XOPEN_SHM },
{ "_XOPEN_STREAMS", _SC_XOPEN_STREAMS },
{ "_XOPEN_UNIX", _SC_XOPEN_UNIX },
/*{ "_XOPEN_UUCP", _SC_XOPEN_UUCP },*/
{ "_XOPEN_VERSION", _SC_XOPEN_VERSION },
};
static const struct var confstr_l[] = {
{ "PATH", _CS_PATH},
{ "POSIX_V7_ILP32_OFF32_CFLAGS", _CS_POSIX_V7_ILP32_OFF32_CFLAGS },
{ "POSIX_V7_ILP32_OFF32_LDFLAGS", _CS_POSIX_V7_ILP32_OFF32_LDFLAGS },
{ "POSIX_V7_ILP32_OFF32_LIBS", _CS_POSIX_V7_ILP32_OFF32_LIBS },
{ "POSIX_V7_ILP32_OFFBIG_CFLAGS", _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS },
{ "POSIX_V7_ILP32_OFFBIG_LDFLAGS", _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS },
{ "POSIX_V7_ILP32_OFFBIG_LIBS", _CS_POSIX_V7_ILP32_OFFBIG_LIBS },
{ "POSIX_V7_LP64_OFF64_CFLAGS", _CS_POSIX_V7_LP64_OFF64_CFLAGS },
{ "POSIX_V7_LP64_OFF64_LDFLAGS", _CS_POSIX_V7_LP64_OFF64_LDFLAGS },
{ "POSIX_V7_LP64_OFF64_LIBS", _CS_POSIX_V7_LP64_OFF64_LIBS },
{ "POSIX_V7_LPBIG_OFFBIG_CFLAGS", _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS },
{ "POSIX_V7_LPBIG_OFFBIG_LDFLAGS", _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS },
{ "POSIX_V7_LPBIG_OFFBIG_LIBS", _CS_POSIX_V7_LPBIG_OFFBIG_LIBS },
/*{ "POSIX_V7_THREADS_CFLAGS", _CS_POSIX_V7_THREADS_CFLAGS },*/
/*{ "POSIX_V7_THREADS_LDFLAGS", _CS_POSIX_V7_THREADS_LDFLAGS },*/
{ "POSIX_V7_WIDTH_RESTRICTED_ENVS", _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS },
/*{ "V7_ENV", _CS_V7_ENV },*/
};
static const struct var limits_l[] = {
{ "_POSIX_CLOCKRES_MIN", _POSIX_CLOCKRES_MIN },
{ "_POSIX_AIO_LISTIO_MAX", _POSIX_AIO_LISTIO_MAX },
{ "_POSIX_AIO_MAX", _POSIX_AIO_MAX },
{ "_POSIX_ARG_MAX", _POSIX_ARG_MAX },
{ "_POSIX_CHILD_MAX", _POSIX_CHILD_MAX },
{ "_POSIX_DELAYTIMER_MAX", _POSIX_DELAYTIMER_MAX },
{ "_POSIX_HOST_NAME_MAX", _POSIX_HOST_NAME_MAX },
{ "_POSIX_LINK_MAX", _POSIX_LINK_MAX },
{ "_POSIX_LOGIN_NAME_MAX", _POSIX_LOGIN_NAME_MAX },
{ "_POSIX_MAX_CANON", _POSIX_MAX_CANON },
{ "_POSIX_MAX_INPUT", _POSIX_MAX_INPUT },
{ "_POSIX_MQ_OPEN_MAX", _POSIX_MQ_OPEN_MAX },
{ "_POSIX_MQ_PRIO_MAX", _POSIX_MQ_PRIO_MAX },
{ "_POSIX_NAME_MAX", _POSIX_NAME_MAX },
{ "_POSIX_NGROUPS_MAX", _POSIX_NGROUPS_MAX },
{ "_POSIX_OPEN_MAX", _POSIX_OPEN_MAX },
{ "_POSIX_PATH_MAX", _POSIX_PATH_MAX },
{ "_POSIX_PIPE_BUF", _POSIX_PIPE_BUF },
{ "_POSIX_RE_DUP_MAX", _POSIX_RE_DUP_MAX },
{ "_POSIX_RTSIG_MAX", _POSIX_RTSIG_MAX },
{ "_POSIX_SEM_NSEMS_MAX", _POSIX_SEM_NSEMS_MAX },
{ "_POSIX_SEM_VALUE_MAX", _POSIX_SEM_VALUE_MAX },
{ "_POSIX_SIGQUEUE_MAX", _POSIX_SIGQUEUE_MAX },
{ "_POSIX_SSIZE_MAX", _POSIX_SSIZE_MAX },
/*{ "_POSIX_SS_REPL_MAX", _POSIX_SS_REPL_MAX },*/
{ "_POSIX_STREAM_MAX", _POSIX_STREAM_MAX },
{ "_POSIX_SYMLINK_MAX", _POSIX_SYMLINK_MAX },
{ "_POSIX_SYMLOOP_MAX", _POSIX_SYMLOOP_MAX },
{ "_POSIX_THREAD_DESTRUCTOR_ITERATIONS", _POSIX_THREAD_DESTRUCTOR_ITERATIONS },
{ "_POSIX_THREAD_KEYS_MAX", _POSIX_THREAD_KEYS_MAX },
{ "_POSIX_THREAD_THREADS_MAX", _POSIX_THREAD_THREADS_MAX },
{ "_POSIX_TIMER_MAX", _POSIX_TIMER_MAX },
{ "_POSIX_TTY_NAME_MAX", _POSIX_TTY_NAME_MAX },
{ "_POSIX_TZNAME_MAX", _POSIX_TZNAME_MAX },
{ "_POSIX2_BC_BASE_MAX", _POSIX2_BC_BASE_MAX },
{ "_POSIX2_BC_DIM_MAX", _POSIX2_BC_DIM_MAX },
{ "_POSIX2_BC_SCALE_MAX", _POSIX2_BC_SCALE_MAX },
{ "_POSIX2_BC_STRING_MAX", _POSIX2_BC_STRING_MAX },
{ "_POSIX2_CHARCLASS_NAME_MAX", _POSIX2_CHARCLASS_NAME_MAX },
{ "_POSIX2_COLL_WEIGHTS_MAX", _POSIX2_COLL_WEIGHTS_MAX },
{ "_POSIX2_EXPR_NEST_MAX", _POSIX2_EXPR_NEST_MAX },
{ "_POSIX2_LINE_MAX", _POSIX2_LINE_MAX },
{ "_POSIX2_RE_DUP_MAX", _POSIX2_RE_DUP_MAX },
};
void
usage(void)
{
eprintf("%s -v spec arc arco\n", argv0);
}
int
main(int argc, char *argv[])
{
size_t len;
long res;
int i;
char *str;
ARGBEGIN {
case 'v':
/* ignore */
(void)(EARGF(usage()));
break;
} ARGEND;
if (argc == 1) {
/* sysconf */
for (i = 0; i < LEN(sysconf_l); i++) {
if (strcmp(argv[0], sysconf_l[i].k))
continue;
errno = 0;
if ((res = sysconf(sysconf_l[i].v)) < 0) {
if (errno)
eprintf("sysconf %ld:", sysconf_l[i].v);
puts("undefined");
} else {
printf("%ld\n", res);
}
return 0;
}
/* confstr */
for (i = 0; i < LEN(confstr_l); i++) {
if (strcmp(argv[0], confstr_l[i].k))
continue;
errno = 0;
if (!(len = confstr(confstr_l[i].v, NULL, 0))) {
if (errno)
eprintf("confstr %ld:", confstr_l[i].v);
puts("undefined");
} else {
str = emalloc(len);
errno = 0;
if (!confstr(confstr_l[i].v, str, len)) {
if (errno)
eprintf("confstr %ld:", confstr_l[i].v);
puts("undefined");
} else {
puts(str);
}
free(str);
}
return 0;
}
/* limits */
for (i = 0; i < LEN(limits_l); i++) {
if (strcmp(argv[0], limits_l[i].k))
continue;
printf("%ld\n", limits_l[i].v);
return 0;
}
} else if (argc == 2) {
/* pathconf */
for (i = 0; i < LEN(pathconf_l); i++) {
if (strcmp(argv[0], pathconf_l[i].k))
continue;
errno = 0;
if ((res = pathconf(argv[1], pathconf_l[i].v)) < 0) {
if (errno)
eprintf("pathconf %ld:", pathconf_l[i].v);
puts("undefined");
} else {
printf("%ld\n", res);
}
return 0;
}
} else {
usage();
}
puts("undefined");
return 1;
}