1 | #define _GNU_SOURCE
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2 | #include <fcntl.h>
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3 | #include <stdarg.h>
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4 | #include <errno.h>
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5 | #include "syscall.h"
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6 | #include "libc.h"
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7 |
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8 | int fcntl(int fd, int cmd, ...)
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9 | {
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10 | unsigned long arg;
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11 | va_list ap;
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12 | va_start(ap, cmd);
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13 | arg = va_arg(ap, unsigned long);
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14 | va_end(ap);
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15 | if (cmd == F_SETFL) arg |= O_LARGEFILE;
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16 | if (cmd == F_SETLKW) return syscall_cp(SYS_fcntl, fd, cmd, (void *)arg);
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17 | if (cmd == F_GETOWN) {
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18 | struct f_owner_ex ex;
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19 | int ret = __syscall(SYS_fcntl, fd, F_GETOWN_EX, &ex);
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20 | if (ret == -EINVAL) return __syscall(SYS_fcntl, fd, cmd, (void *)arg);
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21 | if (ret) return __syscall_ret(ret);
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22 | return ex.type == F_OWNER_PGRP ? -ex.pid : ex.pid;
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23 | }
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24 | if (cmd == F_DUPFD_CLOEXEC) {
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25 | int ret = __syscall(SYS_fcntl, fd, F_DUPFD_CLOEXEC, arg);
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26 | if (ret != -EINVAL) {
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27 | if (ret >= 0)
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28 | __syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
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29 | return __syscall_ret(ret);
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30 | }
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31 | ret = __syscall(SYS_fcntl, fd, F_DUPFD_CLOEXEC, 0);
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32 | if (ret != -EINVAL) {
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33 | if (ret >= 0) __syscall(SYS_close, ret);
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34 | return __syscall_ret(-EINVAL);
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35 | }
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36 | ret = __syscall(SYS_fcntl, fd, F_DUPFD, arg);
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37 | if (ret >= 0) __syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
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38 | return __syscall_ret(ret);
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39 | }
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40 | switch (cmd) {
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41 | case F_SETLK:
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42 | case F_GETLK:
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43 | case F_GETOWN_EX:
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44 | case F_SETOWN_EX:
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45 | return syscall(SYS_fcntl, fd, cmd, (void *)arg);
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46 | default:
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47 | return syscall(SYS_fcntl, fd, cmd, arg);
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48 | }
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49 | }
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