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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/cmd/unix/u9fs/cygwin.c – Rev 2

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/* compatability layer for u9fs support on CYGWIN */
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#include <unistd.h>
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#include <errno.h>
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ssize_t
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pread(int fd, void *p, size_t n, off_t off)
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{
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	off_t ooff;
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	int oerrno;
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	if ((ooff  = lseek(fd, off, SEEK_SET)) == -1)
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		return -1;
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	n = read(fd, p, n);
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	oerrno = errno;
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	lseek(fd, ooff, SEEK_SET);
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	errno = oerrno;
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	return n;
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}
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ssize_t
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pwrite(int fd, const void *p, size_t n, off_t off)
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{
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	off_t ooff;
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	int oerrno;
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	if ((ooff  = lseek(fd, off, SEEK_SET)) == -1)
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		return -1;
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	n = write(fd, p, n);
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	oerrno = errno;
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	lseek(fd, ooff, SEEK_SET);
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	errno = oerrno;
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	return n;
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}
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int
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setreuid(int ruid, int euid)
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{
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	if (ruid != -1)
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		if (setuid(ruid) == -1)
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			return(-1);
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	if (euid != -1)
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		if (seteuid(euid) == -1)
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			return(-1);
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}
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int
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setregid(int rgid, int egid)
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{
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	if (rgid != -1)
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		if (setgid(rgid) == -1)
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			return(-1);
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	if (egid != -1)
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		if (setegid(egid) == -1)
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			return(-1);
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}