Rich Felker
892cafff66
1. don't open /dev/null just as a basis to copy flags; use shared __fmodeflags function to get the right file flags for the mode. 2. handle the case (probably invalid, but whatever) case where the original stream's file descriptor was closed; previously, the logic re-closed it. 3. accept the "e" mode flag for close-on-exec; update dup3 to fallback to using dup2 so we can simply call __dup3 instead of putting fallback logic in freopen itself.
17 lines
409 B
C
17 lines
409 B
C
#include <fcntl.h>
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#include <string.h>
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int __fmodeflags(const char *mode)
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{
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int flags;
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if (strchr(mode, '+')) flags = O_RDWR;
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else if (*mode == 'r') flags = O_RDONLY;
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else flags = O_WRONLY;
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if (strchr(mode, 'x')) flags |= O_EXCL;
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if (strchr(mode, 'e')) flags |= O_CLOEXEC;
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if (*mode != 'r') flags |= O_CREAT;
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if (*mode == 'w') flags |= O_TRUNC;
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if (*mode == 'a') flags |= O_APPEND;
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return flags;
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}
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