25 lines
491 B
C
25 lines
491 B
C
#include <unistd.h>
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ssize_t pwrite(int fd, const void *buf, size_t size, off_t offset)
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{
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off_t current = lseek(fd, 0, SEEK_CUR);
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/* This fails on G-III BFile and non-seekable file descriptors */
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if(current == (off_t)-1)
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return (ssize_t)-1;
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ssize_t rc = -1;
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if(lseek(fd, offset, SEEK_SET) == (off_t)-1)
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goto end;
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rc = write(fd, buf, size);
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if(rc < 0)
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goto end;
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end:
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/* At the end, always try to restore the current position */
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lseek(fd, current, SEEK_CUR);
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return rc;
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}
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