#ifndef VLIBC_SYS_UTSNAME_H
#define VLIBC_SYS_UTSNAME_H

/*
 * vlibc — <sys/utsname.h>.
 *
 * System identification: uname() and struct utsname. uname is XSI [CX] in
 * POSIX.1-2008 (glibc gates it behind _XOPEN_SOURCE, not _POSIX_C_SOURCE),
 * so the whole surface sits at level 2 — nothing here is POSIX.1-2008 base.
 *
 *   Level 2 (muslmimic): uname, struct utsname.
 *
 * struct utsname mirrors the x86_64 kernel's struct new_utsname exactly: six
 * NUL-terminated 65-byte character arrays (the kernel's _UTSNAME_LENGTH, 64
 * usable characters plus the terminator). The kernel's uname syscall copies
 * all 390 bytes, so the layout is an ABI fact, not a style choice.
 * domainname is a Linux extension (the kernel's uts namespace domain name)
 * and is not part of the POSIX struct; it is included for glibc
 * compatibility — POSIX only requires the first five fields.
 *
 * The declaration carries no intent attribute: uname performs I/O with side
 * effects and reports failures through errno, so const/pure would be
 * unsound (see the rationale in <unistd.h>).
 */

#include <vlibc/features.h>

#ifdef __cplusplus
extern "C" {
#endif

#if VLIBC_LEVEL_GE(2)

/*
 * The system identification strings. Each field is NUL-terminated; the
 * 65-byte width matches the kernel buffer (64 characters plus the NUL).
 * sysname is the operating system name ("Linux"), nodename the host name,
 * release the kernel release, version the kernel build, machine the
 * hardware identifier ("x86_64"), and domainname the NIS/UTS domain name.
 */
struct utsname
{
    char sysname[65];    /* operating system name */
    char nodename[65];   /* name within the communications network */
    char release[65];    /* operating system release level */
    char version[65];    /* operating system version */
    char machine[65];    /* hardware type */
    char domainname[65]; /* NIS/UTS domain name (Linux extension) */
};

/*
 * Fill the buffer with the current system identification strings; return
 * 0, or -1 with errno set when the buffer points outside the address
 * space. The strings are copies from the kernel's UTS namespace.
 */
int
uname(struct utsname *buf);

#endif /* VLIBC_LEVEL_GE(2) */

#ifdef __cplusplus
}
#endif

#endif /* VLIBC_SYS_UTSNAME_H */