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GeezerVison is showing github.com — cpython/Python/dup2.c at 3.14 · python/cpython Expand file tree/ Copy pathdup2.cMore file actions 37 lines (34 loc) · 930 Bytes / Copy pathdup2.cFile metadata and controls37 lines (34 loc) · 930 Bytes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 /* * Public domain dup2() lookalike * by Curtis Jackson @ AT&T Technologies, Burlington, NC * electronic address: burl!rcj * * dup2 performs the following functions: * * Check to make sure that fd1 is a valid open file descriptor. * Check to see if fd2 is already open; if so, close it. * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd. * Return fd2 if all went well; return BADEXIT otherwise. */ #include <errno.h> // errno #include <fcntl.h> // fcntl() #include <unistd.h> // close() #define BADEXIT -1 int dup2(int fd1, int fd2) { if (fd1 != fd2) { #ifdef F_DUPFD if (fcntl(fd1, F_GETFL) < 0) return BADEXIT; if (fcntl(fd2, F_GETFL) >= 0) close(fd2); if (fcntl(fd1, F_DUPFD, fd2) < 0) return BADEXIT; #else errno = ENOTSUP; return BADEXIT; #endif } return fd2; } |
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