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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [pwrite64.c] - Rev 438
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/* FUNCTION <<pwrite64>>---write a large file from specified position INDEX pwrite64 ANSI_SYNOPSIS #include <unistd.h> ssize_t pwrite64(int <[fd]>, void *<[buf]>, size_t <[n]>, loff_t <[off]>); TRAD_SYNOPSIS #include <unistd.h> ssize_t pwrite64(<[fd]>, <[buf]>, <[n]>, <[off]>) int <[fd]>; void *<[buf]>; size_t <[n]>; loff_t <[off]>; DESCRIPTION The <<pwrite64>> function is similar to <<pwrite>>. The only difference is that it operates on large files and so takes a 64-bit offset. Like <<pwrite>>>, the file position is unchanged by the function (i.e. the file position is the same before and after a call to <<pwrite>>). RETURNS <<pwrite64>> returns the number of bytes written or <<-1>> if failure occurred. PORTABILITY <<pwrite64>> is an EL/IX extension. Supporting OS subroutine required: <<write>>, <<lseek64>>. */ #include <_ansi.h> #include <unistd.h> #include <reent.h> #include <machine/weakalias.h> ssize_t _DEFUN (__libc_pwrite64, (fd, buf, n, off), int fd _AND _PTR buf _AND size_t n _AND loff_t off) { loff_t cur_pos; _READ_WRITE_RETURN_TYPE num_written; if ((cur_pos = lseek64 (fd, 0, SEEK_CUR)) == (loff_t)-1) return -1; if (lseek64 (fd, off, SEEK_SET) == (loff_t)-1) return -1; num_written = write (fd, buf, n); if (lseek64 (fd, cur_pos, SEEK_SET) == (loff_t)-1) return -1; return (ssize_t)num_written; } weak_alias(__libc_pwrite64,pwrite64)
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