63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/*
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* $Id$
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*
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* These functions provide common methods to ensure a complete read or
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* write occurs. They handle EINTR and partial read/write returns.
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*/
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#include "pam_modutil_private.h"
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#include <unistd.h>
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#include <errno.h>
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int
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pam_modutil_read(int fd, char *buffer, int count)
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{
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int block, offset = 0;
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if (count < 0) {
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errno = EINVAL;
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return -1;
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}
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while (count > 0) {
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block = read(fd, &buffer[offset], count);
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if (block < 0) {
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if (errno == EINTR) continue;
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return block;
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}
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if (block == 0) return offset;
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offset += block;
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count -= block;
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}
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return offset;
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}
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int
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pam_modutil_write(int fd, const char *buffer, int count)
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{
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int block, offset = 0;
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if (count < 0) {
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errno = EINVAL;
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return -1;
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}
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while (count > 0) {
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block = write(fd, &buffer[offset], count);
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if (block < 0) {
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if (errno == EINTR) continue;
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return block;
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}
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if (block == 0) return offset;
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offset += block;
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count -= block;
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}
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return offset;
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}
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