mirror of
https://github.com/fluencelabs/musl
synced 2025-05-06 20:42:14 +00:00
48 lines
994 B
C
48 lines
994 B
C
#include "stdio_impl.h"
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/* The basic idea of this implementation is to open a new FILE,
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* hack the necessary parts of the new FILE into the old one, then
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* close the new FILE. */
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/* Locking is not necessary because, in the event of failure, the stream
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* passed to freopen is invalid as soon as freopen is called. */
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FILE *freopen(const char *filename, const char *mode, FILE *f)
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{
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int fl;
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FILE *f2;
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fflush(f);
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if (!filename) {
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f2 = fopen("/dev/null", mode);
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if (!f2) goto fail;
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fl = syscall(SYS_fcntl, f2->fd, F_GETFL, 0);
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if (fl < 0 || syscall(SYS_fcntl, f->fd, F_SETFL, fl) < 0)
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goto fail2;
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} else {
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f2 = fopen(filename, mode);
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if (!f2) goto fail;
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if (syscall(SYS_dup2, f2->fd, f->fd) < 0)
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goto fail2;
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}
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f->flags = (f->flags & F_PERM) | f2->flags;
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f->read = f2->read;
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f->write = f2->write;
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f->seek = f2->seek;
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f->close = f2->close;
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f->flush = f2->flush;
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fclose(f2);
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return f;
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fail2:
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fclose(f2);
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fail:
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fclose(f);
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return NULL;
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}
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LFS64(freopen);
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