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44 lines
853 B
44 lines
853 B
6 years ago
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#include <litc.h>
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static char buf[1024];
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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 pid = fork();
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int fd, ret;
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if (pid) {
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wait(NULL);
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if ((ret = open("/afile", O_RDONLY, 0)) < 0)
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errx(ret, "open failed");
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fd = ret;
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readprint(fd);
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return 0;
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}
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if ((ret = open("/afile", O_RDWR|O_CREAT, 0755)) < 0)
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errx(ret, "open failed");
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fd = ret;
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snprintf(buf, sizeof(buf), "heeeey yeaaa yeaaa yea yea, heeeeey"
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"yeaaaa, yeaaaa.... i say hey! whats going on!");
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if ((ret = write(fd, buf, strlen(buf))) != strlen(buf))
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errx(ret, "write failed");
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return 0;
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}
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