zig/lib/std/c.zig

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const builtin = @import("builtin");
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const std = @import("std");
const page_size = std.mem.page_size;
pub usingnamespace @import("os/bits.zig");
pub usingnamespace switch (builtin.os) {
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.linux => @import("c/linux.zig"),
.windows => @import("c/windows.zig"),
.macosx, .ios, .tvos, .watchos => @import("c/darwin.zig"),
.freebsd => @import("c/freebsd.zig"),
.netbsd => @import("c/netbsd.zig"),
else => struct {},
};
pub fn getErrno(rc: var) u16 {
if (rc == -1) {
return @intCast(u16, _errno().*);
} else {
return 0;
}
}
/// The return type is `type` to force comptime function call execution.
/// TODO: https://github.com/ziglang/zig/issues/425
/// If not linking libc, returns struct{pub const ok = false;}
/// If linking musl libc, returns struct{pub const ok = true;}
/// If linking gnu libc (glibc), the `ok` value will be true if the target
/// version is greater than or equal to `glibc_version`.
/// If linking a libc other than these, returns `false`.
pub fn versionCheck(glibc_version: builtin.Version) type {
return struct {
pub const ok = blk: {
if (!builtin.link_libc) break :blk false;
switch (builtin.abi) {
.musl, .musleabi, .musleabihf => break :blk true,
.gnu, .gnuabin32, .gnuabi64, .gnueabi, .gnueabihf, .gnux32 => {
const ver = builtin.glibc_version orelse break :blk false;
if (ver.major < glibc_version.major) break :blk false;
if (ver.major > glibc_version.major) break :blk true;
if (ver.minor < glibc_version.minor) break :blk false;
if (ver.minor > glibc_version.minor) break :blk true;
break :blk ver.patch >= glibc_version.patch;
},
else => break :blk false,
}
};
};
}
// TODO https://github.com/ziglang/zig/issues/265 on this whole file
pub extern "c" fn fopen(filename: [*]const u8, modes: [*]const u8) ?*FILE;
pub extern "c" fn fclose(stream: *FILE) c_int;
pub extern "c" fn fwrite(ptr: [*]const u8, size_of_type: usize, item_count: usize, stream: *FILE) usize;
pub extern "c" fn fread(ptr: [*]u8, size_of_type: usize, item_count: usize, stream: *FILE) usize;
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pub extern "c" fn printf(format: [*]const u8, ...) c_int;
pub extern "c" fn abort() noreturn;
pub extern "c" fn exit(code: c_int) noreturn;
pub extern "c" fn isatty(fd: fd_t) c_int;
pub extern "c" fn close(fd: fd_t) c_int;
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pub extern "c" fn @"close$NOCANCEL"(fd: fd_t) c_int;
pub extern "c" fn fstat(fd: fd_t, buf: *Stat) c_int;
pub extern "c" fn @"fstat$INODE64"(fd: fd_t, buf: *Stat) c_int;
significantly increase test coverage * add zig build option `-Dskip-libc` to skip tests that build libc (e.g. if you don't want to wait for musl to build) * add `-Denable-wine` option which uses wine to run cross compiled windows tests on non-windows hosts * add `-Denable-qemu` option which uses qemu to run cross compiled foreign architecture tests * add `-Denable-foreign-glibc=path` option which combined with `-Denable-qemu` enables running cross compiled tests that link against glibc. See https://github.com/ziglang/zig/wiki/Updating-libc#glibc for how to produce this directory. * the test matrix is done manually. release test builds are only enabled by default for the native target. this should save us some CI time, while still providing decent coverage of release builds. - add test coverage for `x86_64-linux-musl -lc` (building musl libc) - add test coverage for `x86_64-linux-gnu -lc` (building glibc) - add test coverage for `aarch64v8_5a-linux-none` - add test coverage for `aarch64v8_5a-linux-musl -lc` (building musl libc) - add test coverage for `aarch64v8_5a-linux-gnu -lc` (building glibc) - add test coverage for `arm-linux-none` - test coverage for `arm-linux-musleabihf -lc` (building musl libc) is disabled due to #3286 - test coverage for `arm-linux-gnueabihf -lc` (building glibc) is disabled due to #3287 - test coverage for `x86_64-windows-gnu -lc` (building mingw-w64) is disabled due to #3285 * enable qemu testing on the Linux CI job. There's not really a good reason to enable wine, since we have a Windows CI job as well. * remove the no longer needed `--build-file ../build.zig` from CI scripts * fix bug in glibc compilation where it wasn't properly reading the abi list txt files, resulting in "key not found" error. * std.build.Target gains: - isNetBSD - isLinux - osRequiresLibC - getArchPtrBitWidth - getExternalExecutor * zig build system gains support for enabling wine and enabling qemu. `artifact.enable_wine = true;`, `artifact.enable_qemu = true;`. This communicates that the system has these tools installed and the build system will use them to run tests. * zig build system gains support for overriding the dynamic linker of an executable artifact. * fix std.c.lseek prototype. makes behavior tests for arm-linux-musleabihf pass. * disable std lib tests that are failing on ARM. See #3288, #3289 * provide `std.os.off_t`. * disable some of the compiler_rt symbols for arm 32 bit. Fixes compiler_rt tests for arm 32 bit * add __stack_chk_guard when linking against glibc. Fixes std lib tests for aarch64-linux-gnu * workaround for "unable to inline function" using `@inlineCall`. Fixes compiler_rt tests for arm 32 bit.
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pub extern "c" fn lseek(fd: fd_t, offset: off_t, whence: c_int) off_t;
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pub extern "c" fn open(path: [*]const u8, oflag: c_uint, ...) c_int;
pub extern "c" fn openat(fd: c_int, path: [*]const u8, oflag: c_uint, ...) c_int;
pub extern "c" fn raise(sig: c_int) c_int;
pub extern "c" fn read(fd: fd_t, buf: [*]u8, nbyte: usize) isize;
pub extern "c" fn readv(fd: c_int, iov: [*]const iovec, iovcnt: c_uint) isize;
pub extern "c" fn pread(fd: fd_t, buf: [*]u8, nbyte: usize, offset: u64) isize;
pub extern "c" fn preadv(fd: c_int, iov: [*]const iovec, iovcnt: c_uint, offset: u64) isize;
pub extern "c" fn writev(fd: c_int, iov: [*]const iovec_const, iovcnt: c_uint) isize;
pub extern "c" fn pwritev(fd: c_int, iov: [*]const iovec_const, iovcnt: c_uint, offset: u64) isize;
pub extern "c" fn stat(noalias path: [*]const u8, noalias buf: *Stat) c_int;
pub extern "c" fn write(fd: fd_t, buf: [*]const u8, nbyte: usize) isize;
pub extern "c" fn pwrite(fd: fd_t, buf: [*]const u8, nbyte: usize, offset: u64) isize;
pub extern "c" fn mmap(addr: ?*align(page_size) c_void, len: usize, prot: c_uint, flags: c_uint, fd: fd_t, offset: u64) *c_void;
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pub extern "c" fn munmap(addr: *align(page_size) c_void, len: usize) c_int;
pub extern "c" fn mprotect(addr: *align(page_size) c_void, len: usize, prot: c_uint) c_int;
pub extern "c" fn unlink(path: [*]const u8) c_int;
breaking: improve std.fs directory handling API * Added `std.c.unlinkat` and `std.os.unlinkat`. * Removed `std.fs.MAX_BUF_BYTES` (this declaration never made it to master branch) * Added `std.fs.Dir.deleteTree` to be used on an open directory handle. * `std.fs.deleteTree` has better behavior for both relative and absolute paths. For absolute paths, it opens the base directory and uses that handle for subsequent operations. For relative paths, it does a similar strategy, using the cwd handle. * The error set of `std.fs.deleteTree` is improved to no longer have these possible errors: - OutOfMemory - FileTooBig - IsDir - DirNotEmpty - PathAlreadyExists - NoSpaceLeft * Added `std.fs.Dir.posix_cwd` which is a statically initialized directory representing the current working directory. * The error set of `std.Dir.open` is improved to no longer have these possible errors: - FileTooBig - IsDir - NoSpaceLeft - PathAlreadyExists - OutOfMemory * Added more alternative functions to `std.fs` for when the path parameter is a null terminated string. This can sometimes be more effecient on systems which have an ABI based on null terminated strings. * Added `std.fs.Dir.openDir`, `std.fs.Dir.deleteFile`, and `std.fs.Dir.deleteDir` which all operate on an open directory handle. * `std.fs.Walker.Entry` now has a `dir` field, which can be used to do operations directly on `std.fs.Walker.Entry.basename`, avoiding `error.NameTooLong` for deeply nested paths. * Added more docs to `std.os.OpenError` This commit does the POSIX components for these changes. I plan to follow up shortly with a commit for Windows.
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pub extern "c" fn unlinkat(dirfd: fd_t, path: [*]const u8, flags: c_uint) c_int;
pub extern "c" fn getcwd(buf: [*]u8, size: usize) ?[*]u8;
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pub extern "c" fn waitpid(pid: c_int, stat_loc: *c_uint, options: c_uint) c_int;
pub extern "c" fn fork() c_int;
pub extern "c" fn access(path: [*]const u8, mode: c_uint) c_int;
pub extern "c" fn pipe(fds: *[2]fd_t) c_int;
pub extern "c" fn pipe2(fds: *[2]fd_t, flags: u32) c_int;
pub extern "c" fn mkdir(path: [*]const u8, mode: c_uint) c_int;
pub extern "c" fn symlink(existing: [*]const u8, new: [*]const u8) c_int;
pub extern "c" fn rename(old: [*]const u8, new: [*]const u8) c_int;
pub extern "c" fn chdir(path: [*]const u8) c_int;
pub extern "c" fn execve(path: [*]const u8, argv: [*]const ?[*]const u8, envp: [*]const ?[*]const u8) c_int;
pub extern "c" fn dup(fd: fd_t) c_int;
pub extern "c" fn dup2(old_fd: fd_t, new_fd: fd_t) c_int;
pub extern "c" fn readlink(noalias path: [*]const u8, noalias buf: [*]u8, bufsize: usize) isize;
pub extern "c" fn realpath(noalias file_name: [*]const u8, noalias resolved_name: [*]u8) ?[*]u8;
pub extern "c" fn sigprocmask(how: c_int, noalias set: *const sigset_t, noalias oset: ?*sigset_t) c_int;
pub extern "c" fn gettimeofday(noalias tv: ?*timeval, noalias tz: ?*timezone) c_int;
pub extern "c" fn sigaction(sig: c_int, noalias act: *const Sigaction, noalias oact: ?*Sigaction) c_int;
pub extern "c" fn nanosleep(rqtp: *const timespec, rmtp: ?*timespec) c_int;
pub extern "c" fn setreuid(ruid: c_uint, euid: c_uint) c_int;
pub extern "c" fn setregid(rgid: c_uint, egid: c_uint) c_int;
pub extern "c" fn rmdir(path: [*]const u8) c_int;
pub extern "c" fn getenv(name: [*]const u8) ?[*]u8;
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pub extern "c" fn sysctl(name: [*]const c_int, namelen: c_uint, oldp: ?*c_void, oldlenp: ?*usize, newp: ?*c_void, newlen: usize) c_int;
pub extern "c" fn sysctlbyname(name: [*]const u8, oldp: ?*c_void, oldlenp: ?*usize, newp: ?*c_void, newlen: usize) c_int;
pub extern "c" fn sysctlnametomib(name: [*]const u8, mibp: ?*c_int, sizep: ?*usize) c_int;
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pub extern "c" fn gethostname(name: [*]u8, len: usize) c_int;
pub extern "c" fn bind(socket: fd_t, address: ?*const sockaddr, address_len: socklen_t) c_int;
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pub extern "c" fn socket(domain: c_uint, sock_type: c_uint, protocol: c_uint) c_int;
pub extern "c" fn listen(sockfd: fd_t, backlog: c_uint) c_int;
pub extern "c" fn getsockname(sockfd: fd_t, noalias addr: *sockaddr, noalias addrlen: *socklen_t) c_int;
pub extern "c" fn connect(sockfd: fd_t, sock_addr: *const sockaddr, addrlen: socklen_t) c_int;
pub extern "c" fn accept4(sockfd: fd_t, addr: *sockaddr, addrlen: *socklen_t, flags: c_uint) c_int;
pub extern "c" fn getsockopt(sockfd: fd_t, level: c_int, optname: c_int, optval: *c_void, optlen: *socklen_t) c_int;
pub extern "c" fn kill(pid: pid_t, sig: c_int) c_int;
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pub extern "c" fn getdirentries(fd: fd_t, buf_ptr: [*]u8, nbytes: usize, basep: *i64) isize;
pub extern "c" fn setgid(ruid: c_uint, euid: c_uint) c_int;
pub extern "c" fn setuid(uid: c_uint) c_int;
pub extern "c" fn clock_gettime(clk_id: c_int, tp: *timespec) c_int;
pub extern "c" fn clock_getres(clk_id: c_int, tp: *timespec) c_int;
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pub extern "c" fn aligned_alloc(alignment: usize, size: usize) ?*c_void;
pub extern "c" fn malloc(usize) ?*c_void;
pub extern "c" fn realloc(?*c_void, usize) ?*c_void;
pub extern "c" fn free(*c_void) void;
pub extern "c" fn posix_memalign(memptr: **c_void, alignment: usize, size: usize) c_int;
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pub extern "c" fn utimensat(dirfd: fd_t, pathname: [*]const u8, times: *[2]timespec, flags: u32) c_int;
pub extern "c" fn futimens(fd: fd_t, times: *const [2]timespec) c_int;
pub extern "c" fn pthread_create(noalias newthread: *pthread_t, noalias attr: ?*const pthread_attr_t, start_routine: extern fn (?*c_void) ?*c_void, noalias arg: ?*c_void) c_int;
pub extern "c" fn pthread_attr_init(attr: *pthread_attr_t) c_int;
pub extern "c" fn pthread_attr_setstack(attr: *pthread_attr_t, stackaddr: *c_void, stacksize: usize) c_int;
pub extern "c" fn pthread_attr_destroy(attr: *pthread_attr_t) c_int;
pub extern "c" fn pthread_self() pthread_t;
pub extern "c" fn pthread_join(thread: pthread_t, arg_return: ?*?*c_void) c_int;
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pub extern "c" fn kqueue() c_int;
pub extern "c" fn kevent(
kq: c_int,
changelist: [*]const Kevent,
nchanges: c_int,
eventlist: [*]Kevent,
nevents: c_int,
timeout: ?*const timespec,
) c_int;