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better grind error messages

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This commit is contained in:
Robert Morris 2020-09-06 14:20:18 -04:00
parent e23d53f27f
commit 2055fe13ac
1 changed files with 19 additions and 19 deletions
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38
user/grind.c
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@ -57,7 +57,7 @@ go(int which_child)
mkdir("grindir");
if(chdir("grindir") != 0){
printf("chdir grindir failed\n");
printf("grind: chdir grindir failed\n");
exit(1);
}
chdir("/");
@ -75,7 +75,7 @@ go(int which_child)
unlink("grindir/../a");
} else if(what == 4){
if(chdir("grindir") != 0){
printf("chdir grindir failed\n");
printf("grind: chdir grindir failed\n");
exit(1);
}
unlink("../b");
@ -139,7 +139,7 @@ go(int which_child)
exit(1);
}
if(chdir("../grindir/..") != 0){
printf("chdir failed\n");
printf("grind: chdir failed\n");
exit(1);
}
kill(pid);
@ -188,7 +188,7 @@ go(int which_child)
unlink("x");
exit(0);
} else if(pid < 0){
printf("fork failed\n");
printf("grind: fork failed\n");
exit(1);
}
wait(0);
@ -198,24 +198,24 @@ go(int which_child)
// file descriptors, blocks.
int fd1 = open("c", O_CREATE|O_RDWR);
if(fd1 < 0){
printf("create c failed\n");
printf("grind: create c failed\n");
exit(1);
}
if(write(fd1, "x", 1) != 1){
printf("write c failed\n");
printf("grind: write c failed\n");
exit(1);
}
struct stat st;
if(fstat(fd1, &st) != 0){
printf("fstat failed\n");
printf("grind: fstat failed\n");
exit(1);
}
if(st.size != 1){
printf("fstat reports wrong size %d\n", (int)st.size);
printf("grind: fstat reports wrong size %d\n", (int)st.size);
exit(1);
}
if(st.ino > 200){
printf("fstat reports crazy i-number %d\n", st.ino);
printf("grind: fstat reports crazy i-number %d\n", st.ino);
exit(1);
}
close(fd1);
@ -224,11 +224,11 @@ go(int which_child)
// echo hi | cat
int aa[2], bb[2];
if(pipe(aa) < 0){
fprintf(2, "pipe failed\n");
fprintf(2, "grind: pipe failed\n");
exit(1);
}
if(pipe(bb) < 0){
fprintf(2, "pipe failed\n");
fprintf(2, "grind: pipe failed\n");
exit(1);
}
int pid1 = fork();
@ -238,16 +238,16 @@ go(int which_child)
close(aa[0]);
close(1);
if(dup(aa[1]) != 1){
fprintf(2, "dup failed\n");
fprintf(2, "grind: dup failed\n");
exit(1);
}
close(aa[1]);
char *args[3] = { "echo", "hi", 0 };
exec("grindir/../echo", args);
fprintf(2, "echo: not found\n");
fprintf(2, "grind: echo: not found\n");
exit(2);
} else if(pid1 < 0){
fprintf(2, "fork failed\n");
fprintf(2, "grind: fork failed\n");
exit(3);
}
int pid2 = fork();
@ -256,22 +256,22 @@ go(int which_child)
close(bb[0]);
close(0);
if(dup(aa[0]) != 0){
fprintf(2, "dup failed\n");
fprintf(2, "grind: dup failed\n");
exit(4);
}
close(aa[0]);
close(1);
if(dup(bb[1]) != 1){
fprintf(2, "dup failed\n");
fprintf(2, "grind: dup failed\n");
exit(5);
}
close(bb[1]);
char *args[2] = { "cat", 0 };
exec("/cat", args);
fprintf(2, "cat: not found\n");
fprintf(2, "grind: cat: not found\n");
exit(6);
} else if(pid2 < 0){
fprintf(2, "fork failed\n");
fprintf(2, "grind: fork failed\n");
exit(7);
}
close(aa[0]);
@ -285,7 +285,7 @@ go(int which_child)
wait(&st1);
wait(&st2);
if(st1 != 0 || st2 != 0 || strcmp(buf, "hi") != 0){
printf("exec pipeline failed %d %d \"%s\"\n", st1, st2, buf);
printf("grind: exec pipeline failed %d %d \"%s\"\n", st1, st2, buf);
exit(1);
}
}