65 lines
1.1 KiB
C
65 lines
1.1 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <err.h>
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#include <stdlib.h>
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int main(void)
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{
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int fd;
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char *wbuf, *rbuf;
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off_t off=0;
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size_t size;
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ssize_t nwritten;
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ssize_t nread;
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char *filename;
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int i;
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printf("Test 54 ");
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fflush(stdout);
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if((filename = mktemp("/tmp/pwrite_test_XXXXXXX")) == NULL) {
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err(1, "Failed to create tempfile");
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}
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if((fd = open(filename, O_CREAT|O_RDWR)) < 0) {
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err(1, "Failed to open %s", filename);
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}
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size = 1 + rand() % 4096;
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off = rand();
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if((wbuf = malloc(sizeof(char)*size)) == NULL) {
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errx(1, "Malloc failed.\n");
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}
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for(i = 0; i < size; i++) {
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wbuf[i] = 1 + rand()%127;
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}
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if((nwritten = pwrite(fd, wbuf, size, off)) < 0) {
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err(1, "pwrite failed");
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}
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if((rbuf = malloc(sizeof(char)*nwritten)) == NULL) {
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errx(1, "Malloc failed.\n");
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}
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if((nread = pread(fd, rbuf, nwritten, off)) < 0) {
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err(1, "pread failed");
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}
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if(strncmp(rbuf, wbuf, nread) != 0) {
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err(1, "Test failed.\n");
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}
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printf(" ok\n");
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close(fd);
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free(wbuf);
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return 0;
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}
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