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Provide more advanced waitpid status analysis

This commit is contained in:
Jeremiah Orians 2022-01-23 13:10:08 -05:00
parent ab43ff0e2d
commit f16fcccb44
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GPG Key ID: 6B3A3F198708F894
2 changed files with 69 additions and 13 deletions
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1
cc.h
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@ -28,6 +28,7 @@
int in_set(int c, char* s);
int match(char* a, char* b);
void require(int bool, char* error);
char* int2str(int x, int base, int signed_p);
void reset_hold_string();

81
cc_spawn.c
View File

@ -134,6 +134,70 @@ void sanity_command_check(char** array)
fputc('\n', stderr);
}
int what_exit(char* program, int status)
{
/***********************************************************************************
* If the low-order 8 bits of w_status are equal to 0x7F or zero, the child *
* process has stopped. If the low-order 8 bits of w_status are non-zero and are *
* not equal to 0x7F, the child process terminated due to a signal otherwise, the *
* child process terminated due to an exit() call. *
* *
* In the event it was a signal that stopped the process the top 8 bits of *
* w_status contain the signal that caused the process to stop. *
* *
* In the event it was terminated the bottom 7 bits of w_status contain the *
* terminating error number for the process. *
* *
* If bit 0x80 of w_status is set, a core dump was produced. *
***********************************************************************************/
int WIFEXITED = !(status & 0x7F);
int WEXITSTATUS = (status & 0xFF00) >> 8;
int WTERMSIG = status & 0x7F;
int WCOREDUMP = status & 0x80;
int WIFSIGNALED = !((0x7F == WTERMSIG) || (0 == WTERMSIG));
int WIFSTOPPED = ((0x7F == WTERMSIG) && (0 == WCOREDUMP));
if(WIFEXITED)
{
if(DEBUG_LEVEL > 2)
{
fputc('\n', stderr);
fputs(program, stderr);
fputs(" normal termination, exit status = ", stderr);
fputs(int2str(WEXITSTATUS, 10, TRUE), stderr);
fputc('\n', stderr);
}
return WEXITSTATUS;
}
else if (WIFSIGNALED)
{
fputc('\n', stderr);
fputs(program, stderr);
fputs(" abnormal termination, signal number = ", stderr);
fputs(int2str(WTERMSIG, 10, TRUE), stderr);
fputc('\n', stderr);
if(WCOREDUMP) fputs("core dumped\n", stderr);
return WTERMSIG;
}
else if(WIFSTOPPED)
{
fputc('\n', stderr);
fputs(program, stderr);
fputs(" child stopped, signal number = ", stderr);
fputs(int2str(WEXITSTATUS, 10, TRUE), stderr);
fputc('\n', stderr);
return WEXITSTATUS;
}
fputc('\n', stderr);
fputs(program, stderr);
fputs(" :: something crazy happened with execve\nI'm just gonna get the hell out of here\n", stderr);
exit(EXIT_FAILURE);
}
void _execute(char* name, char** array, char** envp)
{
int status; /* i.e. return code */
@ -186,22 +250,13 @@ void _execute(char* name, char** array, char** envp)
/* And we should wait for it to complete */
waitpid(f, &status, 0);
/***********************************************************************************
* The bottom 8 bits are for TERMSIG values such as if the program crashed or etc *
* the second 8 bits are for the EXITSTATUS of the program that we waited for *
***********************************************************************************/
if(status != 0)
int result = what_exit(program ,status);
if(0 != result)
{
fputs("Subprocess: ", stderr);
fputs(program, stderr);
if((status & 0x7f) != 0)
{
fputs(" aborted (or crashed)\nAborting for safety\n", stderr);
exit(status & 0x7f);
}
fputs(" exited with error code\nAborting for safety\n", stderr);
exit((status & 0xff00) >> 8);
fputs(" error\nAborting for safety\n", stderr);
exit(result);
}
}