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49 lines
823 B
49 lines
823 B
#include <common.h>
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static char buf[5120];
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void readprint(int fd)
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{
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long ret;
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if ((ret = read(fd, &buf, sizeof(buf))) < 0) {
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err(ret, "read");
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exit(-1);
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}
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printf("FD %d read %ld bytes\n", fd, ret);
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if (ret == sizeof(buf))
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ret = sizeof(buf) - 1;
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buf[ret] = '\0';
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printf("FD %d returned: %s\n", fd, buf);
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}
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int main(int argc, char **argv)
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{
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int pid1 = fork();
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int pid2 = fork();
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int fd;
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if ((fd = open("/boot/uefi/readme.txt", O_RDWR, 0)) < 0) {
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err(fd, "open");
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return -1;
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}
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if (pid1 && pid2) {
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int j;
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for (j = 0; j < 100000000; j++)
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asm volatile("":::"memory");
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readprint(fd);
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return 0;
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}
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int i;
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for (i = 0; i < sizeof(buf); i++)
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buf[i] = 0x41 + (i / 1000);
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int ret;
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if ((ret = write(fd, buf, sizeof(buf))) != sizeof(buf)) {
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err(ret, "write");
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return -1;
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}
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return 0;
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}
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