Rich Felker
594c827a22
open is handled specially because it is used from so many places, in so many variants (2 or 3 arguments, setting errno or not, and cancellable or not). trying to do it as a function would not only increase bloat, but would also risk subtle breakage. this is the first step towards supporting "new" archs where linux lacks "old" syscalls.
32 lines
535 B
C
32 lines
535 B
C
#include "stdio_impl.h"
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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FILE *fopen(const char *restrict filename, const char *restrict mode)
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{
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FILE *f;
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int fd;
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int flags;
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/* Check for valid initial mode character */
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if (!strchr("rwa", *mode)) {
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errno = EINVAL;
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return 0;
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}
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/* Compute the flags to pass to open() */
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flags = __fmodeflags(mode);
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fd = sys_open_cp(filename, flags, 0666);
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if (fd < 0) return 0;
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f = __fdopen(fd, mode);
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if (f) return f;
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__syscall(SYS_close, fd);
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return 0;
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}
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LFS64(fopen);
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