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https://github.com/fluencelabs/musl
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dc01e2cbfb
the other atomic FD_CLOEXEC interfaces (dup3, pipe2, socket) already had such emulation in place. the justification for doing the emulation here is the same as for the other functions: it allows applications to simply use accept4 rather than having to have their own fallback code for ENOSYS/EINVAL (which one you get is arch-specific!) and there is no reasonable way an application could benefit from knowing the operation is emulated/non-atomic since there is no workaround at the application level for non-atomicity (that is the whole reason these interfaces were added).
21 lines
597 B
C
21 lines
597 B
C
#define _GNU_SOURCE
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#include <sys/socket.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "syscall.h"
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#include "libc.h"
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int accept4(int fd, struct sockaddr *restrict addr, socklen_t *restrict len, int flg)
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{
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if (!flg) return accept(fd, addr, len);
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int ret = socketcall_cp(accept4, fd, addr, len, flg, 0, 0);
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if (ret>=0 || (errno != ENOSYS && errno != EINVAL)) return ret;
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ret = accept(fd, addr, len);
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if (ret<0) return ret;
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if (flg & SOCK_CLOEXEC)
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__syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
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if (flg & SOCK_NONBLOCK)
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__syscall(SYS_fcntl, ret, F_SETFL, O_NONBLOCK);
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return ret;
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}
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