getsysinfo(2) — System Calls
NAME
getsysinfo − Gets system information
SYNOPSIS
#include <sys/sysinfo.h>
#include <machine/hal_sysinfo.h>
getsysinfo(op, buffer, nbytes, start, arg, flag)
unsigned long op;
caddr_t buffer;
unsigned long nbytes;
int ∗start;
void ∗arg;
unsigned long ∗flag;
PARAMETERS
opSpecifies the operation to be performed. Values for op are defined in the <sys/sysinfo.h> and <machine/hal_sysinfo.h> header files. See the DESCRIPTION for the operations you can specify.
bufferSpecifies the location where the system information is returned. Its data type depends upon the operation you specify.
nbytesDefines the size of buffer.
startSpecifies the current logical location within the internal system table referenced by the op value. You initially set start parameter to 0 (zero). The getsysinfo() routine updates this value as it retrieves information so that it points to current logical location within the system table. Successive executions of getsysinfo() can then retrieve information about all the system structures specified by op.
The getsysinfo() call sets the start parameter to 0 when all the system information you requested has been retrieved.
arg, flagThe optional arg and flag values can be used by some op values to specify additional information. The data type of these optional parameters depends upon which operation is specified. If an operation does not require these parameters, omit them or set them to NULL.
DESCRIPTION
The getsysinfo system call retrieves information from the system.
When information about multiple system structures is returned, it is stored in consecutive buffer locations. The information for each system structure depends on the op value.
This section lists the various operations that you can specify with the op parameter. It also specifies the data type for the buffer, nbytes, start, and arg parameters where necessary.
GSI_BOOTDEV
Returns the BOOTDEV string, which is used for the installation. (This operator does not require any parameter modifications.)
GSI_BOOTEDFILE
Returns the name of the file from which the currently running kernel was booted. This file might be a statically linked executable, such as vmunix, or a bootstrap linker directive file, such as /etc/sysconfigtab. (See also the description of the GSI_MODULE_LIST operation.)
bufferchar buf[SIZE]
nbytesMust be greater than or equal to 80.
GSI_BOOTTYPE
Returns the name of the network interface over which the kernel was booted. This value is only valid when the kernel is booted from the network. Examples are ln0 (DEC 3000) and te0 (DEC 4000).
bufferchar buf[SIZE]
nbytesMust be greater than or equal to 10.
GSI_BUS_NAME
Returns the name of a start-selected bus.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
startIf start is −1, the name of the nexus iobus is returned in buffer. Otherwise, start points to the bus address and returns the nexus iobus name in buffer.
GSI_BUS_PNAME
Returns the port name of a start-selected bus.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
startIf start is −1, the port name of the nexus iobus is returned in buffer. Otherwise, start points to the bus address and returns the port name of the nexus iobus in buffer.
GSI_BUS_STRUCT
Returns a start-selected bus structure, which is defined in <io/common/devdriver.h>.
bufferstruct bus (/usr/include/io/common/devdriver.h)
nbytesSpecifies the size of the user buffer.
startIf start is −1, the structure of the nexus iobus is returned in buffer. Otherwise, start points to the bus structure and returns the structure of the nexus iobus in buffer.
GSI_BYTEWORD_IO
Returns a non-zero value if the system supports accessing IO space with byte/word load and store instructions. If zero is returned or the call fails, then byte/word IO accesses should not be attempted.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_CLK_TCK
Returns the system clock’s ticks-per-second value in the form of an int. (This operator does not require any parameter modifications.)
GSI_COMPAT_MOD
Returns the address of the start-selected binary compatibility module’s configure function in the form of a pointer.
bufferstruct compat_mod which is defined in <sys/systm.h>
nbytesSpecifies size of compat_mod structure
startPoints to the compat_mod structure and returns the address of the binary compatibility module’s configure function in buffer.
GSI_CPU
Returns the CPU type (from the kernel cpu global variable) in the form of an int.
bufferint
nbytesMust be no less than the size of an int.
GSI_CPU_INFO
Returns the following CPU information:
•The number of the CPU on which the calling thread was running at the time of the getsysinfo() call.
•The number of CPUs capable of running at the time of the getsysinfo() call.
•The type of machine, as defined by the /usr/include/machine/hal/cpuconf.h header file.
•The highest available CPU number. For example, if your system contains three CPUs numbered 0, 2, and 4, the highest available CPU number is 5.
•Bit mask indicating which CPU numbers are currently mapped to physical CPUs. For example, a value of 0x15 indicates that the system contains CPUs numbered 0, 2, and 4.
•Bit mask indicating which CPUs are capable of performing work at the time of the getsysinfo() call.
•Bit mask indicating which CPUs are bound to specific processes.
•Bit mask indicating which CPUs are part of a processor set that is marked for exclusive use by a task. The CPUs might be idle at the time of the getsysinfo() call.
•Speed of the CPU in megahertz.
bufferstruct cpu_info (/usr/include/machine/hal_sysinfo.h)
nbytesSpecifies the size of the user buffer.
GSI_CPUS_IN_BOX
Returns the actual number of CPUs present in the current machine in the form of an int.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_CTLR_NAME
Returns the name of a start-selected controller.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
startPoints to the controller structure and returns the name of that structure in buffer.
GSI_CTLR_PNAME
Returns the port name of a start-selected controller.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
startPoints to the controller structure and returns the port name of that structure in buffer.
GSI_CTLR_STRUCT
Returns a start-selected controller structure, which is defined in <io/common/devdriver.h>.
bufferstruct controller
nbytesSpecifies the size of the user buffer.
startPoints to the controller structure and returns that structure in buffer.
GSI_CURRENT_CPU
Returns the number of the CPU on which the thread is currently running in the form of a long.
bufferlong
GSI_DEV_MOD
Returns a start-selected dev_mod_t structure, which is defined in <sys/sysconfig.h>. (This operator does require any parameter modifications.)
GSI_DEV_NAME
Returns the name of a start-selected device.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
startPoints to the device structure and returns the name of the device structure in buffer.
GSI_DEV_PNAME
Returns the port name of a start-selected device.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
startPoints to the device structure and returns the port name of the device structure in buffer.
GSI_DEV_STRUCT
Returns a start-selected device structure which is defined in <io/common/devdriver.h>.
bufferstruct device (/usr/include/io/common/devdriver.h)
nbytesSpecifies the size of the user buffer.
startPoints to the device structure and returns that structure in buffer.
GSI_DUMPDEV
Returns the dump device descriptor in the form of a dev_t.
bufferdev_t
nbytesSpecifies the size of the user buffer.
GSI_DUMPINFO
Returns the contents of the kernel’s dumpinfo structure (defined in <sys/sysinfo.h>) to allow the savecore utility to retrieve namelist information for the currently running kernel.
bufferstruct dumpinfo
nbytesSpecifies the size of the user buffer.
GSI_FD_NEWMAX
Returns information about the number of open files allowed for a process. The process’s utask structure is checked. If the process has enabled support for up to 64K file descriptors, a 1 is returned. If the process has not enabled support for up to 64K file descriptors, a 0 is returned.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_GRAPHIC_RES
Returns information concerning the graphics screens present in the system. This information consists of the width and height, in pixels, for a graphics device, for example, 1280 x 1024 for the DEC 3000 Model 500 default graphics. The start parameter allows you to step through all of the screens configured in the system (as for GSI_GRAPHICTYPE).
The following is an example of a buffer data structure format that can be used: buffer
struct {
int width;
int height;
} resolution_buffer = {0, 0};
nbytessizeof(resolution_buffer)
startShould be set to zero for the first call. On return, will contain the screen number for which data was returned, or zero (0) after the data for the last screen present in the system was returned on the previous call.
GSI_GRAPHICTYPE
Returns information concerning the graphics screens present in the system. This information consists of the ROM identifier string associated with a graphics device, for example, "PMAGB-BA" for the DEC 3000 Model 500 default graphics. The start parameter allows you to step through all the screens configured in the system (as for GSI_GRAPHIC_RES).
bufferchar buf[SIZE]
nbytessizeof(buff) must be at least 8 bytes. The returned value will be exactly 8 bytes and will not be zero terminated.
startShould be set to zero for the first call. On return, will contain the screen number for which data was returned, or zero (0) after the data for the last screen present in the system was returned on the previous call. If no graphic screens are configured in the system, a value of zero will be returned from the first call. An error of EINVAL will be returned if start is negative or equal to or greater than the number of screens actually configured.
GSI_IEEE_FP_CONTROL
Returns the mask of the currently enabled FP exceptions, defined in <machine/fpu.h> (as "read/write flags"), in the form of a long.
bufferlong
Note: it is recommended that the C library (libc) routine ieee_fp_control() be used instead of getsysinfo(). See the ieee(3) reference page for information on this libc routine.
GSI_IEEE_STATE_AT_SIGNAL
Returns the values set by the user through the SSI_IEEE_STATE_AT_SIGNAL setsysinfo(2) routine. See the IEEE specification for details.
bufferlong
Note: it is recommended that the libc routine ieee_get_state_at_signal() be used instead of getsysinfo(). See the ieee(3) reference page for information on this libc routine.
GSI_IPRSETUP
Returns the settings of the global kernel variables ipforwarding (in bit 1) and ipgateway (in bit 0) for use by the iprsetup utility.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_LMF
Returns LMF (License Management Facility) kernel information. LMF definitions are in the <sys/lmf.h> and <sys/lmfklic.h> header files. You must specify an arg parameter. The other parameter values vary depending on what you specify for arg. See the LMF header files to determine which input parameters are required.
GSI_MAX_CPU
Returns the maximum number of CPUs possible based on current machine in the form of an int. It is based on the highest numbered CPU found in the machine’s current hardware configuration regardless of whether the lower numbered slots contain CPU’s or are empty. For example a system containing CPU’s in slots 0-3 would have a GSI_MAX_CPU value of 4. A system containing only two cpus in slots 0 and 3 (with the other slots being empty) would also have a GSI_MAX_CPU value of 4.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_MAX_UPROCS
Returns the maximum number of processes allowed for each user id.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_MMAPALIGN
Returns the minimum alignment required for an address specified with the MAP_FIXED option in the mmap(2) system call.
GSI_NETBLK
Returns the entire NETBLK structure, which is used for the network installation.
bufferstruct netblk
nbytesSpecifies the size of buffer.
GSI_MODULE_LIST
Returns the following two lists for kernels that are bootstrap linked:
•A space-separated list of the exact module names and linker flags used to build the currently running kernel.
•A space-separated list of the foreign kit names and devices that were added to the kernel from the bootstrap command line.
If the currently running kernel is a statically linked kernel, getsysinfo() returns an empty string.
bufferchar buf[SIZE]
nbytesAt least one page (8192 bytes). In some cases one page is too small to hold the data to be returned. In this case, getsysinfo returns the EFAULT error code. Retry the operation with two or more pages.
GSI_PHYSMEM
Returns the amount of physical memory, in kilobytes, in the form of an int.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_PLATFORM_NAME
Returns the name of the hardware platform. Example platform names are AlphaServer 1000 4/200 and DEC3000−M500.
bufferchar buf[SIZE]
nbytesSpecifies the size of the user buffer.
GSI_PRESTO
Returns the size of nonvolatile RAM (NVRAM) present on systems with PRESTO installed, in the form of a int. (This operator does require any parameter modifications.)
GSI_PROC_TYPE
Returns the processor type, which is defined in <machine/cpuconf.h>. The processor type is returned in the lower 32 bits of the buffer. The higher 32 bits are processor dependent (not always zero) and should be masked off.
bufferlong
nbytesSpecifies the size of the user buffer.
GSI_PROG_ENV
Reserved for future use.
GSI_PROM_ENV
Returns the value of a named console environment variable. If the variable is disabled due to a known firmware problem, then errno will contain EACCES.
bufferSpecifies the location where the value is returned.
arg A string containing the name of the console environment variable.
flagIf the flag contains PROM_CONVERT_TYPE (defined in prom.h), then the kernel does value conversion. Device values are converted from their native bootstring format to a Digital UNIX device name. For example, a GSI_PROM_ENV of a device variable like booted_dev will return a string similar to rz1 instead of SCSI 0 11 0 5 2 0 0. Integer values are returned in a hexadecimal string format, like 0x3F.
GSI_ROOTDEV
Returns the root device descriptor in the form of a dev_t.
bufferlong
nbytesSpecifies the size of the user buffer.
GSI_SCS_SYSID
Returns the first SCS CI port number for SCS_SYSID in the form of a u_short .
bufferu_short
nbytesSpecifies the size of the user buffer.
GSI_SIA_PROC_CRED_VAL
Returns the SIA process authority value in the form of a long.
bufferlong
nbytesSpecifies the size of the user buffer.
GSI_STATIC_DEF
Returns an Assign_entry structure, which is defined in the <sys/conf.h> header file.
bufferstruct aentry
nbytesSpecifies the size of the user buffer.
GSI_TTYP
Returns the major and minor numbers of the controlling terminal.
bufferdev_t
nbytesSpecifies the size of the user buffer.
GSI_UACPARNT
Returns the parent UAC setting in buffer. This setting is determined by the setsysinfo(2) SSIN_UACPARNT operation, which allows users to specify their own unaligned access control (UAC) mechanism. By default, when the operating system accesses unaligned data, it fixes the unaligned accesses and displays a warning message so that the programmer can make the necessary alternations in the code. Meanwhile, however, the program behaves correctly because the operating system has made the necessary temporary adjustments.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_UACPROC
Returns the process UAC setting in buffer. This setting is determined by the setsysinfo(2) SSIN_UACPROC operation, which allows users to specify their own unaligned access control (UAC) mechanism. By default, when the operating system accesses unaligned data, it fixes the unaligned accesses and displays a warning message so that the programmer can make the necessary alternations in the code.
Meanwhile, however, the program behaves correctly because the operating system has made the necessary temporary adjustments.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_UACSYS
Returns the system UAC setting in buffer. This setting is determined by the setsysinfo(2) SSIN_UACSYS operation, which allows the superuser to specify his or her own unaligned access control (UAC) mechanism. By default, when the operating system accesses unaligned data, it fixes the unaligned accesses and displays a warning message so that the programmer can make the necessary alternations in the code. Meanwhile, however, the program behaves correctly because the operating system has made the necessary temporary adjustments.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_IECPARNT
Returns the parent IEC setting in buffer. This setting is determined by the setsysinfo(2) SSIN_IECPARNT operation, which allows users to specify their own instruction emulation control (IEC) mechanism. By default, the operating system emulates instructions not supported by the host processor and displays an informational message (for the first occurrence only). This allows programs executing such instructions to run to completion and produce correct results. However, increased system overhead may degrade the program’s performance.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_IECPROC
Returns the process IEC setting in buffer. This setting is determined by the setsysinfo(2) SSIN_IECPROC operation, which allows users to specify their own instruction emulation control (IEC) mechanism. By default, the operating system emulates instructions not supported by the host processor and displays an informational message (for the first occurrence only). This allows programs executing such instructions to run to completion and produce correct results. However, increased system overhead may degrade the program’s performance.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_IECSYS
Returns the system IEC setting in buffer. This setting is determined by the setsysinfo(2) SSIN_IECSYS operation, which allows the superuser to specify his or her own instruction emulation control (IEC) mechanism. By default, the operating system emulates instructions not supported by the host processor and displays an informational message (for the first occurrence only). This allows programs executing such instructions to run to completion and produce correct results. However, increased system overhead may degrade the program’s performance.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_WSD_CONS
Returns the current console device, graphics (0) or alternate (1), in the form of an int.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_WSD_TYPE
Returns the Workstation Display Type information in the form of an int.
bufferint
nbytesSpecifies the size of the user buffer.
GSI_WSD_UNITS
Returns the Workstation Display Units information in the form of an int. This value is bit-significant; each "on" bit indicates the presence of a graphics head.
bufferint
nbytesSpecifies the size of the user buffer.
MAX_ENVIRON_LENGTH
argSpecifies the name of the console prom environment value.
EXAMPLES
#include <sys/sysinfo.h>
#include <machine/hal_sysinfo.h>
.
.
.
long buf1;
.
.
.
error = getsysinfo(GSI_UACPARNT, &buf1, 4, 0, 0);
The getsysinfo operation, GSI_UACPARNT, returns the parent UAC setting in the buffer.
#include <machine/prom.h>
char evname[]="booted_dev";
char evval[MAX_ENVIRON_LENGTH];
int start=0,status;
status = getsysinfo (GSI_PROM_ENV, evval, MAX_ENVIRON_LENGTH , &start,
evname, PROM_CONVERT_TYPE);
The getsysinfo operation GSI_PROM_ENV returns the value of the named console environment variable. PROM_CONVERT_TYPE indicates that the kernel should do value conversion and MAX_ENVIRON_LENGTH specifies the name of the console prom environment value.
RETURN VALUES
Upon successful completion, the getsysinfo system call returns a value indicating the number of requested items stored in buffer. If the information requested by op is not available, getsysinfo returns a (0) zero. Otherwise, −1 is returned, and the global variable errno is set to indicate the error.
ERRORS
[EFAULT]
Either buffer, start, or arg causes an illegal address to be referenced.
[EINVAL]
The op parameter is invalid.
[EPERM]
Permission is denied for the operation requested.