Modify error messages

generator.c

@@ -323,13 +323,13 @@ int main(int argc, char *argv[])
 
 	shmfd = shm_open(SHM_NAME, O_RDWR | O_CREAT, PERMISSION);
 	if (shmfd == -1) {
-		perror(pname);
+		perror("[./generator] shm_open");
 		exit(EXIT_FAILURE);
 	}
 
 	shared = mmap(NULL, sizeof(*shared), PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
 	if (shared == MAP_FAILED) {
-		perror(pname);
+		perror("[./generator] mmap");
 		exit(EXIT_FAILURE);
 	}
 
@@ -339,7 +339,7 @@ int main(int argc, char *argv[])
 	if (sFreeSpace == SEM_FAILED ||
 	    sUsedSpace == SEM_FAILED ||
 	    sWriteEnd == SEM_FAILED) {
-		perror(pname);
+		perror("[./generator] sem_open");
 		exit(EXIT_FAILURE);
 	}
 

supervisor.c

@@ -156,17 +156,17 @@ int main(int argc, char *argv[])
 
 	shmfd = shm_open(SHM_NAME, O_RDWR | O_CREAT, PERMISSION);
 	if (shmfd == -1) {
-		perror(pname);
+		perror("[./supervisor] shm_open");
 		exit(EXIT_FAILURE);
 	}
 	if (ftruncate(shmfd, sizeof(*shared)) == -1) {
-		perror(pname);
+		perror("[./supervisor] ftruncate");
 		exit(EXIT_FAILURE);
 	}
 
 	shared = mmap(NULL, sizeof(*shared), PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
 	if (shared == MAP_FAILED) {
-		perror(pname);
+		perror("[./supervisor] mmap");
 		exit(EXIT_FAILURE);
 	}