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Add safe_read() to ncmlib and use it in ndhc.

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This commit is contained in:
Nicholas J. Kain
2010-11-13 08:37:33 -05:00
parent a43e69c7ae
commit 693c9256e4
4 changed files with 51 additions and 36 deletions
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26
ncmlib/io.c
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@@ -1,5 +1,5 @@
/* io.c - light wrappers for POSIX i/o functions
* Time-stamp: <2010-11-13 08:08:39 njk>
* Time-stamp: <2010-11-13 08:22:53 njk>
*
* (c) 2010 Nicholas J. Kain <njkain at gmail dot com>
* All rights reserved.
@@ -30,11 +30,29 @@
#include <unistd.h>
#include <errno.h>
// returns -1 on error, >= 0 on success
/* returns -1 on error, >= 0 and equal to # chars read on success */
int safe_read(int fd, char *buf, int len)
{
int r, s = 0;
while (s < len) {
r = read(fd, buf + s, len - s);
if (r == 0)
break;
if (r == -1) {
if (errno == EINTR)
continue;
else
return -1;
}
s += r;
}
return s;
}
/* returns -1 on error, >= 0 and equal to # chars written on success */
int safe_write(int fd, const char *buf, int len)
{
int r;
int s = 0;
int r, s = 0;
while (s < len) {
r = write(fd, buf + s, len - s);
if (r == -1) {

3
ncmlib/io.h
View File

@@ -1,5 +1,5 @@
/* io.h - light wrappers for POSIX i/o functions
* Time-stamp: <2010-11-13 08:07:43 njk>
* Time-stamp: <2010-11-13 08:22:48 njk>
*
* (c) 2010 Nicholas J. Kain <njkain at gmail dot com>
* All rights reserved.
@@ -30,6 +30,7 @@
#ifndef NCM_IO_H_
#define NCM_IO_H_
int safe_read(int fd, char *buf, int len);
int safe_write(int fd, const char *buf, int len);
#endif /* NCM_IO_H_ */