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https://github.com/opencontainers/runc.git
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Rodrigo Campos
90f5da651a
Linux repo has under `tools/include/nolibc` very simple include files that we can use to generate very small binaries that don't depend on libc. To make things even better, since Linux 6.6 it supports all the architectures we support in runc, which is just beautiful. The runc-dmz binary on x86_64 before this patch (on my debian host) was taking 636K, with this patch it takes only 8K. Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* unistd function definitions for NOLIBC
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* Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu>
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*/
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#ifndef _NOLIBC_UNISTD_H
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#define _NOLIBC_UNISTD_H
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#include "std.h"
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#include "arch.h"
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#include "types.h"
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#include "sys.h"
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#define STDIN_FILENO 0
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#define STDOUT_FILENO 1
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#define STDERR_FILENO 2
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static __attribute__((unused))
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int msleep(unsigned int msecs)
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{
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struct timeval my_timeval = { msecs / 1000, (msecs % 1000) * 1000 };
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if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
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return (my_timeval.tv_sec * 1000) +
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(my_timeval.tv_usec / 1000) +
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!!(my_timeval.tv_usec % 1000);
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else
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return 0;
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}
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static __attribute__((unused))
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unsigned int sleep(unsigned int seconds)
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{
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struct timeval my_timeval = { seconds, 0 };
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if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
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return my_timeval.tv_sec + !!my_timeval.tv_usec;
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else
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return 0;
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}
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static __attribute__((unused))
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int usleep(unsigned int usecs)
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{
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struct timeval my_timeval = { usecs / 1000000, usecs % 1000000 };
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return sys_select(0, 0, 0, 0, &my_timeval);
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}
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static __attribute__((unused))
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int tcsetpgrp(int fd, pid_t pid)
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{
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return ioctl(fd, TIOCSPGRP, &pid);
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}
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#define __syscall_narg(_0, _1, _2, _3, _4, _5, _6, N, ...) N
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#define _syscall_narg(...) __syscall_narg(__VA_ARGS__, 6, 5, 4, 3, 2, 1, 0)
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#define _syscall(N, ...) __sysret(my_syscall##N(__VA_ARGS__))
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#define _syscall_n(N, ...) _syscall(N, __VA_ARGS__)
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#define syscall(...) _syscall_n(_syscall_narg(__VA_ARGS__), ##__VA_ARGS__)
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/* make sure to include all global symbols */
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#include "nolibc.h"
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#endif /* _NOLIBC_UNISTD_H */
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