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Mostly rewrite the flag handling of uname(1) to be overridable, such as:

Browse Source 
freefall% uname -s
  FreeBSD
  freefall% env UNAME_s=Linnex ./uname -s
  Linnex

MFC after:	1 month
This commit is contained in:
jmallett 2002-09-18 04:33:10 +00:00
parent e90b0d5381
commit a96623e90a
2 changed files with 171 additions and 70 deletions
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11
usr.bin/uname/uname.1
View File

@ -32,7 +32,7 @@
.\" @(#)uname.1 8.3 (Berkeley) 4/8/94
.\" $FreeBSD$
.\"
.Dd January 14, 2002
.Dd September 18, 2002
.Dt UNAME 1
.Os
.Sh NAME
@ -79,6 +79,15 @@ flag is specified, or multiple flags are specified, all
output is written on a single line, separated by spaces.
.Sh DIAGNOSTICS
.Ex -std
.Sh ENVIRONMENT
An environment variable composed of the string
.Ev UNAME_
followed by any flag to the
.Nm
utility (except for
.Fl a )
will allow the corresponding data to be set to the contents
of the environment variable.
.Sh SEE ALSO
.Xr sysctl 3 ,
.Xr uname 3 ,

230
usr.bin/uname/uname.c
View File

@ -1,4 +1,5 @@
/*-
* Copyright (c) 2002 Juli Mallett.
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
@ -53,22 +54,38 @@ static const char sccsid[] = "@(#)uname.c 8.2 (Berkeley) 5/4/95";
#include <stdlib.h>
#include <unistd.h>
void usage(void);
int
main(int argc, char *argv[])
{
#define MFLAG 0x01
#define NFLAG 0x02
#define PFLAG 0x04
#define RFLAG 0x08
#define SFLAG 0x10
#define VFLAG 0x20
typedef void (*get_t)(void);
get_t get_platform, get_hostname, get_arch, get_release, get_sysname, get_version;
void native_platform(void);
void native_hostname(void);
void native_arch(void);
void native_release(void);
void native_sysname(void);
void native_version(void);
void print_uname(u_int);
void setup_get(void);
void usage(void);
char *platform, *hostname, *arch, *release, *sysname, *version;
const char *prefix;
int
main(int argc, char *argv[])
{
u_int flags;
int ch, mib[2];
size_t len, tlen;
char *p, buf[1024];
const char *prefix;
int ch;
prefix = "";
setup_get();
flags = 0;
while ((ch = getopt(argc, argv, "amnprsv")) != -1)
@ -108,72 +125,147 @@ main(int argc, char *argv[])
if (!flags)
flags |= SFLAG;
prefix = "";
print_uname(flags);
exit(0);
}
if (flags & SFLAG) {
mib[0] = CTL_KERN;
mib[1] = KERN_OSTYPE;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
(void)printf("%s%.*s", prefix, (int)len, buf);
prefix = " ";
#define CHECK_ENV(opt,var) \
do { \
if ((var = getenv("UNAME_" opt)) == NULL) { \
get_##var = native_##var; \
} else { \
get_##var = (get_t)NULL; \
} \
} while (0)
void
setup_get(void)
{
CHECK_ENV("s", sysname);
CHECK_ENV("n", hostname);
CHECK_ENV("r", release);
CHECK_ENV("v", version);
CHECK_ENV("m", platform);
CHECK_ENV("p", arch);
}
#define PRINT_FLAG(flags,flag,var) \
if ((flags & flag) == flag) { \
if (get_##var != NULL) \
(*get_##var)(); \
printf("%s%s", prefix, var); \
prefix = " "; \
}
if (flags & NFLAG) {
mib[0] = CTL_KERN;
mib[1] = KERN_HOSTNAME;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
(void)printf("%s%.*s", prefix, (int)len, buf);
prefix = " ";
}
if (flags & RFLAG) {
mib[0] = CTL_KERN;
mib[1] = KERN_OSRELEASE;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
(void)printf("%s%.*s", prefix, (int)len, buf);
prefix = " ";
}
if (flags & VFLAG) {
mib[0] = CTL_KERN;
mib[1] = KERN_VERSION;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
for (p = buf, tlen = len; tlen--; ++p)
if (*p == '\n' || *p == '\t')
*p = ' ';
(void)printf("%s%.*s", prefix, (int)len, buf);
prefix = " ";
}
if (flags & MFLAG) {
mib[0] = CTL_HW;
mib[1] = HW_MACHINE;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
(void)printf("%s%.*s", prefix, (int)len, buf);
prefix = " ";
}
if (flags & PFLAG) {
mib[0] = CTL_HW;
mib[1] = HW_MACHINE_ARCH;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
(void)printf("%s%.*s", prefix, (int)len, buf);
prefix = " ";
}
(void)printf("\n");
exit (0);
void
print_uname(u_int flags)
{
PRINT_FLAG(flags, SFLAG, sysname);
PRINT_FLAG(flags, NFLAG, hostname);
PRINT_FLAG(flags, RFLAG, release);
PRINT_FLAG(flags, VFLAG, version);
PRINT_FLAG(flags, MFLAG, platform);
PRINT_FLAG(flags, PFLAG, arch);
printf("\n");
}
void
native_sysname(void)
{
int mib[2];
size_t len;
static char buf[1024];
mib[0] = CTL_KERN;
mib[1] = KERN_OSTYPE;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
sysname = buf;
}
void
native_hostname(void)
{
int mib[2];
size_t len;
static char buf[1024];
mib[0] = CTL_KERN;
mib[1] = KERN_HOSTNAME;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
hostname = buf;
}
void
native_release(void)
{
int mib[2];
size_t len;
static char buf[1024];
mib[0] = CTL_KERN;
mib[1] = KERN_OSRELEASE;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
release = buf;
}
void
native_version(void)
{
int mib[2];
size_t len, tlen;
char *p;
static char buf[1024];
mib[0] = CTL_KERN;
mib[1] = KERN_VERSION;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
for (p = buf, tlen = len; tlen--; ++p)
if (*p == '\n' || *p == '\t')
*p = ' ';
version = buf;
}
void
native_platform(void)
{
int mib[2];
size_t len;
static char buf[1024];
mib[0] = CTL_HW;
mib[1] = HW_MACHINE;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
platform = buf;
}
void
native_arch(void)
{
int mib[2];
size_t len;
static char buf[1024];
mib[0] = CTL_HW;
mib[1] = HW_MACHINE_ARCH;
len = sizeof(buf);
if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
err(1, "sysctl");
arch = buf;
}
void
usage(void)
{
(void)fprintf(stderr, "usage: uname [-amnprsv]\n");
fprintf(stderr, "usage: uname [-amnprsv]\n");
exit(1);
}