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zdtm: lib: add {read,write}_data helpers

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Some tests expect that all the data will be handled in a single invocation
of read/write system call. But it possible to have short read/write on a
loaded system and this is not an error.
Add helper functions that will reliably read/write the entire buffer.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Mike Rapoport 2017-11-30 13:46:18 +02:00 • committed by Andrei Vagin
parent 39d65fba82
commit a76ff847d6
2 changed files with 35 additions and 0 deletions
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33
test/zdtm/lib/streamutil.c
View file

@ -40,3 +40,36 @@ int pipe_in2out(int infd, int outfd, uint8_t *buffer, int length)
}
}
}
int read_data(int fd, unsigned char *buf, int size)
{
int cur = 0;
int ret;
while (cur != size) {
ret = read(fd, buf + cur, size - cur);
if (ret <= 0) {
pr_perror("read(%d) = %d", size - cur, ret);
return -1;
}
cur += ret;
}
return 0;
}
int write_data(int fd, const unsigned char *buf, int size)
{
int cur = 0;
int ret;
while (cur != size) {
ret = write(fd, buf + cur, size - cur);
if (ret <= 0) {
pr_perror("write(%d) = %d", size - cur, ret);
return -1;
}
cur += ret;
}
return 0;
}

2
test/zdtm/lib/zdtmtst.h
View file

@ -55,6 +55,8 @@ extern int datasum(const uint8_t *buffer, unsigned length, uint32_t *crc);
/* streaming helpers */
extern int set_nonblock(int fd, int on);
extern int pipe_in2out(int infd, int outfd, uint8_t *buffer, int length);
extern int read_data(int fd, unsigned char *buf, int len);
extern int write_data(int fd, const unsigned char *buf, int len);
/* command line args */
struct long_opt {