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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 committed by Frans Kaashoek
parent b418a34537
commit 8c67f96b72
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"); mkdir("grindir");
if(chdir("grindir") != 0){ if(chdir("grindir") != 0){
printf("chdir grindir failed\n"); printf("grind: chdir grindir failed\n");
exit(1); exit(1);
} }
chdir("/"); chdir("/");
@ -75,7 +75,7 @@ go(int which_child)
unlink("grindir/../a"); unlink("grindir/../a");
} else if(what == 4){ } else if(what == 4){
if(chdir("grindir") != 0){ if(chdir("grindir") != 0){
printf("chdir grindir failed\n"); printf("grind: chdir grindir failed\n");
exit(1); exit(1);
} }
unlink("../b"); unlink("../b");
@ -139,7 +139,7 @@ go(int which_child)
exit(1); exit(1);
} }
if(chdir("../grindir/..") != 0){ if(chdir("../grindir/..") != 0){
printf("chdir failed\n"); printf("grind: chdir failed\n");
exit(1); exit(1);
} }
kill(pid); kill(pid);
@ -188,7 +188,7 @@ go(int which_child)
unlink("x"); unlink("x");
exit(0); exit(0);
} else if(pid < 0){ } else if(pid < 0){
printf("fork failed\n"); printf("grind: fork failed\n");
exit(1); exit(1);
} }
wait(0); wait(0);
@ -198,24 +198,24 @@ go(int which_child)
// file descriptors, blocks. // file descriptors, blocks.
int fd1 = open("c", O_CREATE|O_RDWR); int fd1 = open("c", O_CREATE|O_RDWR);
if(fd1 < 0){ if(fd1 < 0){
printf("create c failed\n"); printf("grind: create c failed\n");
exit(1); exit(1);
} }
if(write(fd1, "x", 1) != 1){ if(write(fd1, "x", 1) != 1){
printf("write c failed\n"); printf("grind: write c failed\n");
exit(1); exit(1);
} }
struct stat st; struct stat st;
if(fstat(fd1, &st) != 0){ if(fstat(fd1, &st) != 0){
printf("fstat failed\n"); printf("grind: fstat failed\n");
exit(1); exit(1);
} }
if(st.size != 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); exit(1);
} }
if(st.ino > 200){ 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); exit(1);
} }
close(fd1); close(fd1);
@ -224,11 +224,11 @@ go(int which_child)
// echo hi | cat // echo hi | cat
int aa[2], bb[2]; int aa[2], bb[2];
if(pipe(aa) < 0){ if(pipe(aa) < 0){
fprintf(2, "pipe failed\n"); fprintf(2, "grind: pipe failed\n");
exit(1); exit(1);
} }
if(pipe(bb) < 0){ if(pipe(bb) < 0){
fprintf(2, "pipe failed\n"); fprintf(2, "grind: pipe failed\n");
exit(1); exit(1);
} }
int pid1 = fork(); int pid1 = fork();
@ -238,16 +238,16 @@ go(int which_child)
close(aa[0]); close(aa[0]);
close(1); close(1);
if(dup(aa[1]) != 1){ if(dup(aa[1]) != 1){
fprintf(2, "dup failed\n"); fprintf(2, "grind: dup failed\n");
exit(1); exit(1);
} }
close(aa[1]); close(aa[1]);
char *args[3] = { "echo", "hi", 0 }; char *args[3] = { "echo", "hi", 0 };
exec("grindir/../echo", args); exec("grindir/../echo", args);
fprintf(2, "echo: not found\n"); fprintf(2, "grind: echo: not found\n");
exit(2); exit(2);
} else if(pid1 < 0){ } else if(pid1 < 0){
fprintf(2, "fork failed\n"); fprintf(2, "grind: fork failed\n");
exit(3); exit(3);
} }
int pid2 = fork(); int pid2 = fork();
@ -256,22 +256,22 @@ go(int which_child)
close(bb[0]); close(bb[0]);
close(0); close(0);
if(dup(aa[0]) != 0){ if(dup(aa[0]) != 0){
fprintf(2, "dup failed\n"); fprintf(2, "grind: dup failed\n");
exit(4); exit(4);
} }
close(aa[0]); close(aa[0]);
close(1); close(1);
if(dup(bb[1]) != 1){ if(dup(bb[1]) != 1){
fprintf(2, "dup failed\n"); fprintf(2, "grind: dup failed\n");
exit(5); exit(5);
} }
close(bb[1]); close(bb[1]);
char *args[2] = { "cat", 0 }; char *args[2] = { "cat", 0 };
exec("/cat", args); exec("/cat", args);
fprintf(2, "cat: not found\n"); fprintf(2, "grind: cat: not found\n");
exit(6); exit(6);
} else if(pid2 < 0){ } else if(pid2 < 0){
fprintf(2, "fork failed\n"); fprintf(2, "grind: fork failed\n");
exit(7); exit(7);
} }
close(aa[0]); close(aa[0]);
@ -285,7 +285,7 @@ go(int which_child)
wait(&st1); wait(&st1);
wait(&st2); wait(&st2);
if(st1 != 0 || st2 != 0 || strcmp(buf, "hi") != 0){ 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); exit(1);
} }
} }