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author | bors[bot] <bors[bot]@users.noreply.github.com> | 2017-07-15 15:36:23 +0000 |
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committer | bors[bot] <bors[bot]@users.noreply.github.com> | 2017-07-15 15:36:23 +0000 |
commit | f84a008559d4f8ce0a79652ad0c515e7139a272c (patch) | |
tree | 83e0872d9678ab981a384d7247a76bf33d5bcbb6 /src | |
parent | da49f2aa5265bcf667469d5ab5ac8253d53da7d7 (diff) | |
parent | b259964a773154bb743cab8ffaaa97729042e312 (diff) | |
download | nix-f84a008559d4f8ce0a79652ad0c515e7139a272c.zip |
Merge #630
630: Add wrappers for sysconf(3), pathconf(2), and fpathconf(2) r=asomers
Diffstat (limited to 'src')
-rw-r--r-- | src/unistd.rs | 620 |
1 files changed, 619 insertions, 1 deletions
diff --git a/src/unistd.rs b/src/unistd.rs index 2925f41c..3209bb98 100644 --- a/src/unistd.rs +++ b/src/unistd.rs @@ -1,9 +1,11 @@ //! Safe wrappers around functions found in libc "unistd.h" header +use errno; use {Errno, Error, Result, NixPath}; use fcntl::{fcntl, OFlag, O_CLOEXEC, FD_CLOEXEC}; use fcntl::FcntlArg::F_SETFD; -use libc::{self, c_char, c_void, c_int, c_uint, size_t, pid_t, off_t, uid_t, gid_t, mode_t}; +use libc::{self, c_char, c_void, c_int, c_long, c_uint, size_t, pid_t, off_t, + uid_t, gid_t, mode_t}; use std::mem; use std::ffi::{CString, CStr, OsString, OsStr}; use std::os::unix::ffi::{OsStringExt, OsStrExt}; @@ -937,6 +939,622 @@ pub fn mkstemp<P: ?Sized + NixPath>(template: &P) -> Result<(RawFd, PathBuf)> { Ok((fd, PathBuf::from(pathname))) } +/// Variable names for `pathconf` +/// +/// Nix uses the same naming convention for these variables as the +/// [getconf(1)](http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getconf.html) utility. +/// That is, `PathconfVar` variables have the same name as the abstract +/// variables shown in the `pathconf(2)` man page. Usually, it's the same as +/// the C variable name without the leading `_PC_`. +/// +/// POSIX 1003.1-2008 standardizes all of these variables, but some OSes choose +/// not to implement variables that cannot change at runtime. +/// +/// # References +/// +/// - [pathconf(2)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/pathconf.html) +/// - [limits.h](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html) +/// - [unistd.h](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html) +#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)] +#[repr(i32)] +pub enum PathconfVar { + #[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "linux", + target_os = "netbsd", target_os = "openbsd"))] + /// Minimum number of bits needed to represent, as a signed integer value, + /// the maximum size of a regular file allowed in the specified directory. + FILESIZEBITS = libc::_PC_FILESIZEBITS, + /// Maximum number of links to a single file. + LINK_MAX = libc::_PC_LINK_MAX, + /// Maximum number of bytes in a terminal canonical input line. + MAX_CANON = libc::_PC_MAX_CANON, + /// Minimum number of bytes for which space is available in a terminal input + /// queue; therefore, the maximum number of bytes a conforming application + /// may require to be typed as input before reading them. + MAX_INPUT = libc::_PC_MAX_INPUT, + /// Maximum number of bytes in a filename (not including the terminating + /// null of a filename string). + NAME_MAX = libc::_PC_NAME_MAX, + /// Maximum number of bytes the implementation will store as a pathname in a + /// user-supplied buffer of unspecified size, including the terminating null + /// character. Minimum number the implementation will accept as the maximum + /// number of bytes in a pathname. + PATH_MAX = libc::_PC_PATH_MAX, + /// Maximum number of bytes that is guaranteed to be atomic when writing to + /// a pipe. + PIPE_BUF = libc::_PC_PIPE_BUF, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "linux", + target_os = "netbsd", target_os = "openbsd"))] + /// Symbolic links can be created. + POSIX2_SYMLINKS = libc::_PC_2_SYMLINKS, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Minimum number of bytes of storage actually allocated for any portion of + /// a file. + POSIX_ALLOC_SIZE_MIN = libc::_PC_ALLOC_SIZE_MIN, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Recommended increment for file transfer sizes between the + /// `POSIX_REC_MIN_XFER_SIZE` and `POSIX_REC_MAX_XFER_SIZE` values. + POSIX_REC_INCR_XFER_SIZE = libc::_PC_REC_INCR_XFER_SIZE, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Maximum recommended file transfer size. + POSIX_REC_MAX_XFER_SIZE = libc::_PC_REC_MAX_XFER_SIZE, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Minimum recommended file transfer size. + POSIX_REC_MIN_XFER_SIZE = libc::_PC_REC_MIN_XFER_SIZE, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Recommended file transfer buffer alignment. + POSIX_REC_XFER_ALIGN = libc::_PC_REC_XFER_ALIGN, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "netbsd", target_os = "openbsd"))] + /// Maximum number of bytes in a symbolic link. + SYMLINK_MAX = libc::_PC_SYMLINK_MAX, + /// The use of `chown` and `fchown` is restricted to a process with + /// appropriate privileges, and to changing the group ID of a file only to + /// the effective group ID of the process or to one of its supplementary + /// group IDs. + _POSIX_CHOWN_RESTRICTED = libc::_PC_CHOWN_RESTRICTED, + /// Pathname components longer than {NAME_MAX} generate an error. + _POSIX_NO_TRUNC = libc::_PC_NO_TRUNC, + /// This symbol shall be defined to be the value of a character that shall + /// disable terminal special character handling. + _POSIX_VDISABLE = libc::_PC_VDISABLE, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Asynchronous input or output operations may be performed for the + /// associated file. + _POSIX_ASYNC_IO = libc::_PC_ASYNC_IO, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "openbsd"))] + /// Prioritized input or output operations may be performed for the + /// associated file. + _POSIX_PRIO_IO = libc::_PC_PRIO_IO, + #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "freebsd", + target_os = "linux", target_os = "netbsd", target_os = "openbsd"))] + /// Synchronized input or output operations may be performed for the + /// associated file. + _POSIX_SYNC_IO = libc::_PC_SYNC_IO, + #[cfg(any(target_os = "dragonfly", target_os = "openbsd"))] + /// The resolution in nanoseconds for all file timestamps. + _POSIX_TIMESTAMP_RESOLUTION = libc::_PC_TIMESTAMP_RESOLUTION +} + +/// Like `pathconf`, but works with file descriptors instead of paths (see +/// [fpathconf(2)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/pathconf.html)) +/// +/// # Parameters +/// +/// - `fd`: The file descriptor whose variable should be interrogated +/// - `var`: The pathconf variable to lookup +/// +/// # Returns +/// +/// - `Ok(Some(x))`: the variable's limit (for limit variables) or its +/// implementation level (for option variables). Implementation levels are +/// usually a decimal-coded date, such as 200112 for POSIX 2001.12 +/// - `Ok(None)`: the variable has no limit (for limit variables) or is +/// unsupported (for option variables) +/// - `Err(x)`: an error occurred +pub fn fpathconf(fd: RawFd, var: PathconfVar) -> Result<Option<c_long>> { + let raw = unsafe { + Errno::clear(); + libc::fpathconf(fd, var as c_int) + }; + if raw == -1 { + if errno::errno() == 0 { + Ok(None) + } else { + Err(Error::Sys(Errno::last())) + } + } else { + Ok(Some(raw)) + } +} + +/// Get path-dependent configurable system variables (see +/// [pathconf(2)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/pathconf.html)) +/// +/// Returns the value of a path-dependent configurable system variable. Most +/// supported variables also have associated compile-time constants, but POSIX +/// allows their values to change at runtime. There are generally two types of +/// `pathconf` variables: options and limits. See [pathconf(2)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/pathconf.html) for more details. +/// +/// # Parameters +/// +/// - `path`: Lookup the value of `var` for this file or directory +/// - `var`: The `pathconf` variable to lookup +/// +/// # Returns +/// +/// - `Ok(Some(x))`: the variable's limit (for limit variables) or its +/// implementation level (for option variables). Implementation levels are +/// usually a decimal-coded date, such as 200112 for POSIX 2001.12 +/// - `Ok(None)`: the variable has no limit (for limit variables) or is +/// unsupported (for option variables) +/// - `Err(x)`: an error occurred +pub fn pathconf<P: ?Sized + NixPath>(path: &P, var: PathconfVar) -> Result<Option<c_long>> { + let raw = try!(path.with_nix_path(|cstr| { + unsafe { + Errno::clear(); + libc::pathconf(cstr.as_ptr(), var as c_int) + } + })); + if raw == -1 { + if errno::errno() == 0 { + Ok(None) + } else { + Err(Error::Sys(Errno::last())) + } + } else { + Ok(Some(raw)) + } +} + +/// Variable names for `sysconf` +/// +/// Nix uses the same naming convention for these variables as the +/// [getconf(1)](http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getconf.html) utility. +/// That is, `SysconfVar` variables have the same name as the abstract variables +/// shown in the `sysconf(3)` man page. Usually, it's the same as the C +/// variable name without the leading `_SC_`. +/// +/// All of these symbols are standardized by POSIX 1003.1-2008, but haven't been +/// implemented by all platforms. +/// +/// # References +/// +/// - [sysconf(3)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html) +/// - [unistd.h](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html) +/// - [limits.h](http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html) +#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)] +#[repr(i32)] +pub enum SysconfVar { + /// Maximum number of I/O operations in a single list I/O call supported by + /// the implementation. + AIO_LISTIO_MAX = libc::_SC_AIO_LISTIO_MAX, + /// Maximum number of outstanding asynchronous I/O operations supported by + /// the implementation. + AIO_MAX = libc::_SC_AIO_MAX, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The maximum amount by which a process can decrease its asynchronous I/O + /// priority level from its own scheduling priority. + AIO_PRIO_DELTA_MAX = libc::_SC_AIO_PRIO_DELTA_MAX, + /// Maximum length of argument to the exec functions including environment data. + ARG_MAX = libc::_SC_ARG_MAX, + /// Maximum number of functions that may be registered with `atexit`. + ATEXIT_MAX = libc::_SC_ATEXIT_MAX, + /// Maximum obase values allowed by the bc utility. + BC_BASE_MAX = libc::_SC_BC_BASE_MAX, + /// Maximum number of elements permitted in an array by the bc utility. + BC_DIM_MAX = libc::_SC_BC_DIM_MAX, + /// Maximum scale value allowed by the bc utility. + BC_SCALE_MAX = libc::_SC_BC_SCALE_MAX, + /// Maximum length of a string constant accepted by the bc utility. + BC_STRING_MAX = libc::_SC_BC_STRING_MAX, + /// Maximum number of simultaneous processes per real user ID. + CHILD_MAX = libc::_SC_CHILD_MAX, + // _SC_CLK_TCK is obsolete + /// Maximum number of weights that can be assigned to an entry of the + /// LC_COLLATE order keyword in the locale definition file + COLL_WEIGHTS_MAX = libc::_SC_COLL_WEIGHTS_MAX, + /// Maximum number of timer expiration overruns. + DELAYTIMER_MAX = libc::_SC_DELAYTIMER_MAX, + /// Maximum number of expressions that can be nested within parentheses by + /// the expr utility. + EXPR_NEST_MAX = libc::_SC_EXPR_NEST_MAX, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// Maximum length of a host name (not including the terminating null) as + /// returned from the `gethostname` function + HOST_NAME_MAX = libc::_SC_HOST_NAME_MAX, + /// Maximum number of iovec structures that one process has available for + /// use with `readv` or `writev`. + IOV_MAX = libc::_SC_IOV_MAX, + /// Unless otherwise noted, the maximum length, in bytes, of a utility's + /// input line (either standard input or another file), when the utility is + /// described as processing text files. The length includes room for the + /// trailing <newline>. + LINE_MAX = libc::_SC_LINE_MAX, + /// Maximum length of a login name. + LOGIN_NAME_MAX = libc::_SC_LOGIN_NAME_MAX, + /// Maximum number of simultaneous supplementary group IDs per process. + NGROUPS_MAX = libc::_SC_NGROUPS_MAX, + /// Initial size of `getgrgid_r` and `getgrnam_r` data buffers + GETGR_R_SIZE_MAX = libc::_SC_GETGR_R_SIZE_MAX, + /// Initial size of `getpwuid_r` and `getpwnam_r` data buffers + GETPW_R_SIZE_MAX = libc::_SC_GETPW_R_SIZE_MAX, + /// The maximum number of open message queue descriptors a process may hold. + MQ_OPEN_MAX = libc::_SC_MQ_OPEN_MAX, + /// The maximum number of message priorities supported by the implementation. + MQ_PRIO_MAX = libc::_SC_MQ_PRIO_MAX, + /// A value one greater than the maximum value that the system may assign to + /// a newly-created file descriptor. + OPEN_MAX = libc::_SC_OPEN_MAX, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Advisory Information option. + _POSIX_ADVISORY_INFO = libc::_SC_ADVISORY_INFO, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports barriers. + _POSIX_BARRIERS = libc::_SC_BARRIERS, + /// The implementation supports asynchronous input and output. + _POSIX_ASYNCHRONOUS_IO = libc::_SC_ASYNCHRONOUS_IO, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports clock selection. + _POSIX_CLOCK_SELECTION = libc::_SC_CLOCK_SELECTION, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Process CPU-Time Clocks option. + _POSIX_CPUTIME = libc::_SC_CPUTIME, + /// The implementation supports the File Synchronization option. + _POSIX_FSYNC = libc::_SC_FSYNC, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the IPv6 option. + _POSIX_IPV6 = libc::_SC_IPV6, + /// The implementation supports job control. + _POSIX_JOB_CONTROL = libc::_SC_JOB_CONTROL, + /// The implementation supports memory mapped Files. + _POSIX_MAPPED_FILES = libc::_SC_MAPPED_FILES, + /// The implementation supports the Process Memory Locking option. + _POSIX_MEMLOCK = libc::_SC_MEMLOCK, + /// The implementation supports the Range Memory Locking option. + _POSIX_MEMLOCK_RANGE = libc::_SC_MEMLOCK_RANGE, + /// The implementation supports memory protection. + _POSIX_MEMORY_PROTECTION = libc::_SC_MEMORY_PROTECTION, + /// The implementation supports the Message Passing option. + _POSIX_MESSAGE_PASSING = libc::_SC_MESSAGE_PASSING, + /// The implementation supports the Monotonic Clock option. + _POSIX_MONOTONIC_CLOCK = libc::_SC_MONOTONIC_CLOCK, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The implementation supports the Prioritized Input and Output option. + _POSIX_PRIORITIZED_IO = libc::_SC_PRIORITIZED_IO, + /// The implementation supports the Process Scheduling option. + _POSIX_PRIORITY_SCHEDULING = libc::_SC_PRIORITY_SCHEDULING, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Raw Sockets option. + _POSIX_RAW_SOCKETS = libc::_SC_RAW_SOCKETS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports read-write locks. + _POSIX_READER_WRITER_LOCKS = libc::_SC_READER_WRITER_LOCKS, + #[cfg(any(target_os = "android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os = "openbsd"))] + /// The implementation supports realtime signals. + _POSIX_REALTIME_SIGNALS = libc::_SC_REALTIME_SIGNALS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Regular Expression Handling option. + _POSIX_REGEXP = libc::_SC_REGEXP, + /// Each process has a saved set-user-ID and a saved set-group-ID. + _POSIX_SAVED_IDS = libc::_SC_SAVED_IDS, + /// The implementation supports semaphores. + _POSIX_SEMAPHORES = libc::_SC_SEMAPHORES, + /// The implementation supports the Shared Memory Objects option. + _POSIX_SHARED_MEMORY_OBJECTS = libc::_SC_SHARED_MEMORY_OBJECTS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the POSIX shell. + _POSIX_SHELL = libc::_SC_SHELL, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Spawn option. + _POSIX_SPAWN = libc::_SC_SPAWN, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports spin locks. + _POSIX_SPIN_LOCKS = libc::_SC_SPIN_LOCKS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Process Sporadic Server option. + _POSIX_SPORADIC_SERVER = libc::_SC_SPORADIC_SERVER, + #[cfg(any(target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + _POSIX_SS_REPL_MAX = libc::_SC_SS_REPL_MAX, + /// The implementation supports the Synchronized Input and Output option. + _POSIX_SYNCHRONIZED_IO = libc::_SC_SYNCHRONIZED_IO, + /// The implementation supports the Thread Stack Address Attribute option. + _POSIX_THREAD_ATTR_STACKADDR = libc::_SC_THREAD_ATTR_STACKADDR, + /// The implementation supports the Thread Stack Size Attribute option. + _POSIX_THREAD_ATTR_STACKSIZE = libc::_SC_THREAD_ATTR_STACKSIZE, + #[cfg(any(target_os = "ios", target_os="linux", target_os = "macos", + target_os="netbsd", target_os="openbsd"))] + /// The implementation supports the Thread CPU-Time Clocks option. + _POSIX_THREAD_CPUTIME = libc::_SC_THREAD_CPUTIME, + /// The implementation supports the Non-Robust Mutex Priority Inheritance + /// option. + _POSIX_THREAD_PRIO_INHERIT = libc::_SC_THREAD_PRIO_INHERIT, + /// The implementation supports the Non-Robust Mutex Priority Protection option. + _POSIX_THREAD_PRIO_PROTECT = libc::_SC_THREAD_PRIO_PROTECT, + /// The implementation supports the Thread Execution Scheduling option. + _POSIX_THREAD_PRIORITY_SCHEDULING = libc::_SC_THREAD_PRIORITY_SCHEDULING, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Thread Process-Shared Synchronization + /// option. + _POSIX_THREAD_PROCESS_SHARED = libc::_SC_THREAD_PROCESS_SHARED, + #[cfg(any(target_os="dragonfly", target_os="linux", target_os="openbsd"))] + /// The implementation supports the Robust Mutex Priority Inheritance option. + _POSIX_THREAD_ROBUST_PRIO_INHERIT = libc::_SC_THREAD_ROBUST_PRIO_INHERIT, + #[cfg(any(target_os="dragonfly", target_os="linux", target_os="openbsd"))] + /// The implementation supports the Robust Mutex Priority Protection option. + _POSIX_THREAD_ROBUST_PRIO_PROTECT = libc::_SC_THREAD_ROBUST_PRIO_PROTECT, + /// The implementation supports thread-safe functions. + _POSIX_THREAD_SAFE_FUNCTIONS = libc::_SC_THREAD_SAFE_FUNCTIONS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Thread Sporadic Server option. + _POSIX_THREAD_SPORADIC_SERVER = libc::_SC_THREAD_SPORADIC_SERVER, + /// The implementation supports threads. + _POSIX_THREADS = libc::_SC_THREADS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports timeouts. + _POSIX_TIMEOUTS = libc::_SC_TIMEOUTS, + /// The implementation supports timers. + _POSIX_TIMERS = libc::_SC_TIMERS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Trace option. + _POSIX_TRACE = libc::_SC_TRACE, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Trace Event Filter option. + _POSIX_TRACE_EVENT_FILTER = libc::_SC_TRACE_EVENT_FILTER, + #[cfg(any(target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + _POSIX_TRACE_EVENT_NAME_MAX = libc::_SC_TRACE_EVENT_NAME_MAX, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Trace Inherit option. + _POSIX_TRACE_INHERIT = libc::_SC_TRACE_INHERIT, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Trace Log option. + _POSIX_TRACE_LOG = libc::_SC_TRACE_LOG, + #[cfg(any(target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + _POSIX_TRACE_NAME_MAX = libc::_SC_TRACE_NAME_MAX, + #[cfg(any(target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + _POSIX_TRACE_SYS_MAX = libc::_SC_TRACE_SYS_MAX, + #[cfg(any(target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + _POSIX_TRACE_USER_EVENT_MAX = libc::_SC_TRACE_USER_EVENT_MAX, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the Typed Memory Objects option. + _POSIX_TYPED_MEMORY_OBJECTS = libc::_SC_TYPED_MEMORY_OBJECTS, + /// Integer value indicating version of this standard (C-language binding) + /// to which the implementation conforms. For implementations conforming to + /// POSIX.1-2008, the value shall be 200809L. + _POSIX_VERSION = libc::_SC_VERSION, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation provides a C-language compilation environment with + /// 32-bit `int`, `long`, `pointer`, and `off_t` types. + _POSIX_V6_ILP32_OFF32 = libc::_SC_V6_ILP32_OFF32, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation provides a C-language compilation environment with + /// 32-bit `int`, `long`, and pointer types and an `off_t` type using at + /// least 64 bits. + _POSIX_V6_ILP32_OFFBIG = libc::_SC_V6_ILP32_OFFBIG, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation provides a C-language compilation environment with + /// 32-bit `int` and 64-bit `long`, `pointer`, and `off_t` types. + _POSIX_V6_LP64_OFF64 = libc::_SC_V6_LP64_OFF64, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation provides a C-language compilation environment with an + /// `int` type using at least 32 bits and `long`, pointer, and `off_t` types + /// using at least 64 bits. + _POSIX_V6_LPBIG_OFFBIG = libc::_SC_V6_LPBIG_OFFBIG, + /// The implementation supports the C-Language Binding option. + _POSIX2_C_BIND = libc::_SC_2_C_BIND, + /// The implementation supports the C-Language Development Utilities option. + _POSIX2_C_DEV = libc::_SC_2_C_DEV, + /// The implementation supports the Terminal Characteristics option. + _POSIX2_CHAR_TERM = libc::_SC_2_CHAR_TERM, + /// The implementation supports the FORTRAN Development Utilities option. + _POSIX2_FORT_DEV = libc::_SC_2_FORT_DEV, + /// The implementation supports the FORTRAN Runtime Utilities option. + _POSIX2_FORT_RUN = libc::_SC_2_FORT_RUN, + /// The implementation supports the creation of locales by the localedef + /// utility. + _POSIX2_LOCALEDEF = libc::_SC_2_LOCALEDEF, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Batch Environment Services and Utilities + /// option. + _POSIX2_PBS = libc::_SC_2_PBS, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Batch Accounting option. + _POSIX2_PBS_ACCOUNTING = libc::_SC_2_PBS_ACCOUNTING, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Batch Checkpoint/Restart option. + _POSIX2_PBS_CHECKPOINT = libc::_SC_2_PBS_CHECKPOINT, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Locate Batch Job Request option. + _POSIX2_PBS_LOCATE = libc::_SC_2_PBS_LOCATE, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Batch Job Message Request option. + _POSIX2_PBS_MESSAGE = libc::_SC_2_PBS_MESSAGE, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + /// The implementation supports the Track Batch Job Request option. + _POSIX2_PBS_TRACK = libc::_SC_2_PBS_TRACK, + /// The implementation supports the Software Development Utilities option. + _POSIX2_SW_DEV = libc::_SC_2_SW_DEV, + /// The implementation supports the User Portability Utilities option. + _POSIX2_UPE = libc::_SC_2_UPE, + /// Integer value indicating version of the Shell and Utilities volume of + /// POSIX.1 to which the implementation conforms. + _POSIX2_VERSION = libc::_SC_2_VERSION, + /// The size of a system page in bytes. + /// + /// POSIX also defines an alias named `PAGESIZE`, but Rust does not allow two + /// enum constants to have the same value, so nix omits `PAGESIZE`. + PAGE_SIZE = libc::_SC_PAGE_SIZE, + PTHREAD_DESTRUCTOR_ITERATIONS = libc::_SC_THREAD_DESTRUCTOR_ITERATIONS, + PTHREAD_KEYS_MAX = libc::_SC_THREAD_KEYS_MAX, + PTHREAD_STACK_MIN = libc::_SC_THREAD_STACK_MIN, + PTHREAD_THREADS_MAX = libc::_SC_THREAD_THREADS_MAX, + RE_DUP_MAX = libc::_SC_RE_DUP_MAX, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + RTSIG_MAX = libc::_SC_RTSIG_MAX, + SEM_NSEMS_MAX = libc::_SC_SEM_NSEMS_MAX, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + SEM_VALUE_MAX = libc::_SC_SEM_VALUE_MAX, + #[cfg(any(target_os = "android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os = "openbsd"))] + SIGQUEUE_MAX = libc::_SC_SIGQUEUE_MAX, + STREAM_MAX = libc::_SC_STREAM_MAX, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="netbsd", + target_os="openbsd"))] + SYMLOOP_MAX = libc::_SC_SYMLOOP_MAX, + TIMER_MAX = libc::_SC_TIMER_MAX, + TTY_NAME_MAX = libc::_SC_TTY_NAME_MAX, + TZNAME_MAX = libc::_SC_TZNAME_MAX, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The implementation supports the X/Open Encryption Option Group. + _XOPEN_CRYPT = libc::_SC_XOPEN_CRYPT, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The implementation supports the Issue 4, Version 2 Enhanced + /// Internationalization Option Group. + _XOPEN_ENH_I18N = libc::_SC_XOPEN_ENH_I18N, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + _XOPEN_LEGACY = libc::_SC_XOPEN_LEGACY, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The implementation supports the X/Open Realtime Option Group. + _XOPEN_REALTIME = libc::_SC_XOPEN_REALTIME, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The implementation supports the X/Open Realtime Threads Option Group. + _XOPEN_REALTIME_THREADS = libc::_SC_XOPEN_REALTIME_THREADS, + /// The implementation supports the Issue 4, Version 2 Shared Memory Option + /// Group. + _XOPEN_SHM = libc::_SC_XOPEN_SHM, + #[cfg(any(target_os="dragonfly", target_os="freebsd", target_os = "ios", + target_os="linux", target_os = "macos", target_os="openbsd"))] + /// The implementation supports the XSI STREAMS Option Group. + _XOPEN_STREAMS = libc::_SC_XOPEN_STREAMS, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// The implementation supports the XSI option + _XOPEN_UNIX = libc::_SC_XOPEN_UNIX, + #[cfg(any(target_os="android", target_os="dragonfly", target_os="freebsd", + target_os = "ios", target_os="linux", target_os = "macos", + target_os="openbsd"))] + /// Integer value indicating version of the X/Open Portability Guide to + /// which the implementation conforms. + _XOPEN_VERSION = libc::_SC_XOPEN_VERSION, +} + +/// Get configurable system variables (see +/// [sysconf(3)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html)) +/// +/// Returns the value of a configurable system variable. Most supported +/// variables also have associated compile-time constants, but POSIX +/// allows their values to change at runtime. There are generally two types of +/// sysconf variables: options and limits. See sysconf(3) for more details. +/// +/// # Returns +/// +/// - `Ok(Some(x))`: the variable's limit (for limit variables) or its +/// implementation level (for option variables). Implementation levels are +/// usually a decimal-coded date, such as 200112 for POSIX 2001.12 +/// - `Ok(None)`: the variable has no limit (for limit variables) or is +/// unsupported (for option variables) +/// - `Err(x)`: an error occurred +pub fn sysconf(var: SysconfVar) -> Result<Option<c_long>> { + let raw = unsafe { + Errno::clear(); + libc::sysconf(var as c_int) + }; + if raw == -1 { + if errno::errno() == 0 { + Ok(None) + } else { + Err(Error::Sys(Errno::last())) + } + } else { + Ok(Some(raw)) + } +} + #[cfg(any(target_os = "linux", target_os = "android"))] mod linux { use libc; |