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Python/dup2.c
37 строк
930 B
Victor Stinner
gh-108765: Python.h no longer includes <unistd.h> (#108783)
02 сен 2023, 17:50
Не верифицирован
02 сен 2023, 17:50
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/* * 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; }